bfgminer/README

This is a multi-threaded multi-pool GPU, FPGA and CPU miner with ATI GPU
monitoring, (over)clocking and fanspeed support for bitcoin and derivative
coins. Do not use on multiple block chains at the same time!

This code is provided entirely free of charge by the programmer in his spare
time so donations would be greatly appreciated. Please consider donating to the
address below.

Con Kolivas <kernel@kolivas.org>
15qSxP1SQcUX3o4nhkfdbgyoWEFMomJ4rZ

DOWNLOADS:

http://ck.kolivas.org/apps/cgminer

GIT TREE:

https://github.com/ckolivas/cgminer

Support thread:

http://bitcointalk.org/index.php?topic=28402.0

IRC Channel:

irc://irc.freenode.net/cgminer

License: GPLv3.  See COPYING for details.

READ EXECUTIVE SUMMARY BELOW FOR FIRST TIME USERS!

Dependencies:
	curl dev library 	http://curl.haxx.se/libcurl/
	(libcurl4-openssl-dev)
	curses dev library
	(libncurses5-dev or libpdcurses on WIN32)
	pkg-config		http://www.freedesktop.org/wiki/Software/pkg-config
	jansson			http://www.digip.org/jansson/
	(jansson is included in-tree and not necessary)
	yasm 1.0.1+ http://yasm.tortall.net/
	(yasm is optional, gives assembly routines for CPU mining)
	AMD APP SDK		http://developer.amd.com/sdks/AMDAPPSDK
	(This sdk is mandatory for GPU mining)
	AMD ADL SDK		http://developer.amd.com/sdks/ADLSDK
	(This sdk is mandatory for ATI GPU monitoring & clocking)
	libudev headers
	(This is only required for FPGA auto-detection and is linux only)
	libusb headers
	(This is only required for ZTEX support)

CGMiner specific configuration options:
	--enable-cpumining      Build with cpu mining support(default disabled)
	--disable-opencl        Override detection and disable building with opencl
	--disable-adl           Override detection and disable building with adl
	--enable-bitforce       Compile support for BitForce FPGAs(default disabled)
	--enable-icarus         Compile support for Icarus Board(default disabled)
	--enable-ztex           Compile support for Ztex Board(default disabled)

Basic *nix build instructions:
	To build with GPU mining support:
	Install AMD APP sdk, ideal version (see FAQ!) - no official place to
	install it so just keep track of where it is if you're not installing
	the include files and library files into the system directory.
	(Do NOT install the ati amd sdk if you are on nvidia.)
	To build with GPU monitoring & clocking support:
	Extract the AMD ADL SDK, latest version - there is also no official
	place for these files. Copy all the *.h files in the "include"
	directory into cgminer's ADL_SDK directory.

The easiest way to install the ATI AMD SPP sdk on linux is to actually put it
into a system location. Then building will be simpler. Download the correct
version for either 32 bit or 64 bit from here:
	http://developer.amd.com/sdks/AMDAPPSDK/downloads/Pages/default.aspx

This will give you a file with a name like AMD-APP-SDK-v2.4-lnx64.tgz

Then:

sudo su
cd /opt
tar xf /path/to/AMD-APP-SDK-v2.4-lnx64.tgz
cd /
tar xf /opt/AMD-APP-SDK-v2.4-lnx64/icd-registration.tgz
ln -s /opt/AMD-APP-SDK-v2.4-lnx64/include/CL /usr/include
ln -s /opt/AMD-APP-SDK-v2.4-lnx64/lib/x86_64/* /usr/lib/
ldconfig

If you are on 32 bit, x86_64 in the 2nd last line should be x86

	To actually build:

	./autogen.sh	# only needed if building from git repo
	CFLAGS="-O2 -Wall -march=native" ./configure
	or if you haven't installed the ati files in system locations:
	CFLAGS="-O2 -Wall -march=native -I<path to AMD APP include>" LDFLAGS="-L<path to AMD APP lib/x86_64> ./configure
	make
	
	If it finds the opencl files it will inform you with
	"OpenCL: FOUND. GPU mining support enabled."

Basic WIN32 build instructions (LIKELY OUTDATED INFO. requires mingw32):
	./autogen.sh	# only needed if building from git repo
	rm -f mingw32-config.cache
	MINGW32_CFLAGS="-O2 -Wall -msse2" mingw32-configure
	make
	./mknsis.sh
	
Native WIN32 build instructions: see windows-build.txt

---

Usage instructions:  Run "cgminer --help" to see options:

Usage: . [-atDdGCgIKklmpPQqrRsTouvwOchnV] 
Options for both config file and command line:
--api-allow         Allow API access (if enabled) only to the given list of [W:]IP[/Prefix] address[/subnets]
                    This overrides --api-network and you must specify 127.0.0.1 if it is required
                    W: in front of the IP address gives that address privileged access to all api commands
--api-description   Description placed in the API status header (default: cgminer version)
--api-listen        Listen for API requests (default: disabled)
                    By default any command that does not just display data returns access denied
                    See --api-allow to overcome this
--api-network       Allow API (if enabled) to listen on/for any address (default: only 127.0.0.1)
--api-port          Port number of miner API (default: 4028)
--auto-fan          Automatically adjust all GPU fan speeds to maintain a target temperature
--auto-gpu          Automatically adjust all GPU engine clock speeds to maintain a target temperature
--benchmark         Run cgminer in benchmark mode - produces no shares
--debug|-D          Enable debug output
--expiry|-E <arg>   Upper bound on how many seconds after getting work we consider a share from it stale (default: 120)
--failover-only     Don't leak work to backup pools when primary pool is lagging
--load-balance      Change multipool strategy from failover to even load balance
--log|-l <arg>      Interval in seconds between log output (default: 5)
--monitor|-m <arg>  Use custom pipe cmd for output messages
--net-delay         Impose small delays in networking to not overload slow routers
--no-pool-disable   Do not automatically disable pools that continually reject shares
--no-submit-stale   Don't submit shares if they are detected as stale
--pass|-p <arg>     Password for bitcoin JSON-RPC server
--per-device-stats  Force verbose mode and output per-device statistics
--protocol-dump|-P  Verbose dump of protocol-level activities
--queue|-Q <arg>    Minimum number of work items to have queued (0 - 10) (default: 1)
--quiet|-q          Disable logging output, display status and errors
--real-quiet        Disable all output
--remove-disabled   Remove disabled devices entirely, as if they didn't exist
--retries|-r <arg>  Number of times to retry before giving up, if JSON-RPC call fails (-1 means never) (default: -1)
--retry-pause|-R <arg> Number of seconds to pause, between retries (default: 5)
--rotate <arg>      Change multipool strategy from failover to regularly rotate at N minutes (default: 0)
--round-robin       Change multipool strategy from failover to round robin on failure
--scan-time|-s <arg> Upper bound on time spent scanning current work, in seconds (default: 60)
--sched-start <arg> Set a time of day in HH:MM to start mining (a once off without a stop time)
--sched-stop <arg>  Set a time of day in HH:MM to stop mining (will quit without a start time)
--sharelog <arg>    Append share log to file
--shares <arg>      Quit after mining N shares (default: unlimited)
--socks-proxy <arg> Set socks4 proxy (host:port)
--syslog            Use system log for output messages (default: standard error)
--temp-cutoff <arg> Temperature where a device will be automatically disabled, one value or comma separated list (default: 95)
--text-only|-T      Disable ncurses formatted screen output
--url|-o <arg>      URL for bitcoin JSON-RPC server
--user|-u <arg>     Username for bitcoin JSON-RPC server
--verbose           Log verbose output to stderr as well as status output
--userpass|-O <arg> Username:Password pair for bitcoin JSON-RPC server
Options for command line only:
--config|-c <arg>   Load a JSON-format configuration file
See example.conf for an example configuration.
--help|-h           Print this message
--version|-V        Display version and exit


GPU only options:

--auto-fan          Automatically adjust all GPU fan speeds to maintain a target temperature
--auto-gpu          Automatically adjust all GPU engine clock speeds to maintain a target temperature
--device|-d <arg>   Select device to use, (Use repeat -d for multiple devices, default: all)
--disable-gpu|-G    Disable GPU mining even if suitable devices exist
--gpu-threads|-g <arg> Number of threads per GPU (1 - 10) (default: 2)
--gpu-dyninterval <arg> Set the refresh interval in ms for GPUs using dynamic intensity (default: 7)
--gpu-engine <arg>  GPU engine (over)clock range in Mhz - one value, range and/or comma separated list (e.g. 850-900,900,750-850)
--gpu-fan <arg>     GPU fan percentage range - one value, range and/or comma separated list (e.g. 25-85,85,65)
--gpu-map <arg>     Map OpenCL to ADL device order manually, paired CSV (e.g. 1:0,2:1 maps OpenCL 1 to ADL 0, 2 to 1)
--gpu-memclock <arg> Set the GPU memory (over)clock in Mhz - one value for all or separate by commas for per card.
--gpu-memdiff <arg> Set a fixed difference in clock speed between the GPU and memory in auto-gpu mode
--gpu-powertune <arg> Set the GPU powertune percentage - one value for all or separate by commas for per card.
--gpu-reorder       Attempt to reorder GPU devices according to PCI Bus ID
--gpu-vddc <arg>    Set the GPU voltage in Volts - one value for all or separate by commas for per card.
--intensity|-I <arg> Intensity of GPU scanning (d or -10 -> 10, default: d to maintain desktop interactivity)
--kernel|-k <arg>   Override kernel to use (diablo, poclbm, phatk or diakgcn) - one value or comma separated
--kernel-path|-K <arg> Specify a path to where the kernel .cl files are (default: "/usr/local/bin")
--ndevs|-n          Enumerate number of detected GPUs and exit
--no-restart        Do not attempt to restart GPUs that hang
--temp-hysteresis <arg> Set how much the temperature can fluctuate outside limits when automanaging speeds (default: 3)
--temp-overheat <arg> Overheat temperature when automatically managing fan and GPU speeds (default: 85)
--temp-target <arg> Target temperature when automatically managing fan and GPU speeds (default: 75)
--vectors|-v <arg>  Override detected optimal vector (1, 2 or 4) - one value or comma separated list
--worksize|-w <arg> Override detected optimal worksize - one value or comma separated list


FPGA mining boards(BitForce, Icarus, Ztex) only options:

--scan-serial|-S <arg> Serial port to probe for FPGA mining device

     By default, cgminer will scan for autodetected FPGAs unless at least one
     -S is specified for that driver. If you specify -S and still want cgminer
     to scan, you must also use "-S auto". If you want to prevent cgminer from
     scanning without specifying a device, you can use "-S noauto". Note that
     presently, autodetection only works on Linux, and might only detect one
     device depending on the version of udev being used.

     On linux <arg> is usually of the format /dev/ttyUSBn
     On windows <arg> is usually of the format \\.\COMn
       (where n = the correct device number for the FPGA device)

--icarus-timing <arg> Set how the Icarus timing is calculated - one setting/value for all or comma separated
           default       Use the default Icarus hash time (2.6316ns)
           short         Calculate the hash time and stop adjusting it at ~315 difficulty 1 shares (~1hr)
           long          Re-calculate the hash time continuously
           value         Specify the hash time in nanoseconds (e.g. 2.6316)

     Icarus timing is required for devices that do not exactly match a default Icarus Rev3 in
     processing speed
     If you have an Icarus Rev3 you should not norally need to use --icarus-timing since the
     default values will maximise the MH/s and display it correctly

     Icarus timing is used to determine the number of hashes that have been checked when it aborts
     a nonce range (including on a LongPoll)
     It is also used to determine the elapsed time when it should abort a nonce range to avoid
     letting the Icarus to go idle, but also to safely maximise that time

     'short' or 'long' mode should only be used on a computer that has enough CPU available to run
     cgminer without any CPU delays (an active desktop or swapping computer would not be stable enough)
     Any CPU delays while calculating the hash time will affect the result
     'short' mode only requires the computer to be stable until it has completed ~315 difficulty 1 shares
     'long' mode requires it to always be stable to ensure accuracy, however, over time it continually
     corrects itself

     When in 'short' or 'long' mode, it will report the hash time value each time it is re-calculated
     In 'short' or 'long' mode, the scan abort time starts at 5 seconds and uses the default 2.6316ns
     scan hash time, for the first 5 nonce's or one minute (whichever is longer)

     In 'default' or 'value' mode the 'constants' are calculated once at the start, based on the default
     value or the value specified

     To determine the hash time value for a non Icarus Rev3 device or an Icarus Rev3 with a different
     bitstream to the default one, use 'long' mode and give it at least a few hundred shares, or use
     'short' mode and take note of the final hash time value (Hs) calculated
     You can also use the RPC API 'stats' command to see the current hash time (Hs) at any time

     The Icarus code currently only works with a dual FPGA device that supports the same commands as
     Icarus Rev3 requires and also is less than ~840MH/s and greater than 2MH/s
     If a dual FPGA device does hash faster than ~840MH/s it should work correctly if you supply the
     correct hash time nanoseconds value

     The timing code itself will affect the Icarus performance since it increases the delay after
     work is completed or aborted until it starts again
     The increase is, however, extremely small and the actual increase is reported with the
     RPC API 'stats' command (a very slow CPU will make it more noticeable)
     Using the 'short' mode will remove this delay after 'short' mode completes
     The delay doesn't affect the calculation of the correct hash time


CPU only options (deprecated, not included in binaries!):

--algo|-a <arg>     Specify sha256 implementation for CPU mining:
        auto            Benchmark at startup and pick fastest algorithm
        c               Linux kernel sha256, implemented in C
        4way            tcatm's 4-way SSE2 implementation
        via             VIA padlock implementation
        cryptopp        Crypto++ C/C++ implementation
        sse2_64         SSE2 64 bit implementation for x86_64 machines
        sse4_64         SSE4.1 64 bit implementation for x86_64 machines (default: sse2_64)
--cpu-threads|-t <arg> Number of miner CPU threads (default: 4)
--enable-cpu|-C     Enable CPU mining with other mining (default: no CPU mining if other devices exist)



---

EXECUTIVE SUMMARY ON USAGE:

After saving configuration from the menu, you do not need to give cgminer any
arguments and it will load your configuration.

Any configuration file may also contain a single
	"include" : "filename"
to recursively include another configuration file.
Writing the configuration will save all settings from all files in the output.


Single pool, regular desktop:

cgminer -o http://pool:port -u username -p password

Single pool, dedicated miner:

cgminer -o http://pool:port -u username -p password -I 9

Single pool, first card regular desktop, 3 other dedicated cards:

cgminer -o http://pool:port -u username -p password -I d,9,9,9

Multiple pool, dedicated miner:

cgminer -o http://pool1:port -u pool1username -p pool1password -o http://pool2:port -u pool2usernmae -p pool2password -I 9

Add overclocking settings, GPU and fan control for all cards:

cgminer -o http://pool:port -u username -p password -I 9 --auto-fan --auto-gpu --gpu-engine 750-950 --gpu-memclock 300

Add overclocking settings, GPU and fan control with different engine settings for 4 cards:

cgminer -o http://pool:port -u username -p password -I 9 --auto-fan --auto-gpu --gpu-engine 750-950,945,700-930,960 --gpu-memclock 300

READ WARNINGS AND DOCUMENTATION BELOW ABOUT OVERCLOCKING

On Linux you virtually always need to export your display settings before
starting to get all the cards recognised and/or temperature+clocking working:

export DISPLAY=:0

---

WHILE RUNNING:

The following options are available while running with a single keypress:

[P]ool management [G]PU management [S]ettings [D]isplay options [Q]uit

P gives you:

Current pool management strategy: Failover
[A]dd pool [R]emove pool [D]isable pool [E]nable pool
[C]hange management strategy [S]witch pool [I]nformation


S gives you:

[Q]ueue: 1
[S]cantime: 60
[E]xpiry: 120
[R]etries: -1
[P]ause: 5
[W]rite config file


D gives you:

Toggle: [D]ebug [N]ormal [S]ilent [V]erbose [R]PC debug
[L]og interval [C]lear


Q quits the application.


G gives you something like:

GPU 0: [124.2 / 191.3 Mh/s] [Q:212  A:77  R:33  HW:0  E:36%  U:1.73/m]
Temp: 67.0 C
Fan Speed: 35% (2500 RPM)
Engine Clock: 960 MHz
Memory Clock: 480 Mhz
Vddc: 1.200 V
Activity: 93%
Powertune: 0%
Last initialised: [2011-09-06 12:03:56]
Thread 0: 62.4 Mh/s Enabled ALIVE
Thread 1: 60.2 Mh/s Enabled ALIVE

[E]nable [D]isable [R]estart GPU [C]hange settings
Or press any other key to continue


---
Also many issues and FAQs are covered in the forum thread
dedicated to this program,
	http://forum.bitcoin.org/index.php?topic=28402.0

The output line shows the following:
(5s):1713.6 (avg):1707.8 Mh/s | Q:301  A:729  R:8  HW:0  E:242%  U:22.53/m

Each column is as follows:
5s:  A 5 second exponentially decaying average hash rate
avg: An all time average hash rate
Q:   The number of requested (Queued) work items from the pools
A:   The number of Accepted shares
R:   The number of Rejected shares
HW:  The number of HardWare errors
E:   The Efficiency defined as number of shares returned / work item
U:   The Utility defined as the number of shares / minute

 GPU 1: 73.5C 2551RPM | 427.3/443.0Mh/s | A:8 R:0 HW:0 U:4.39/m

Each column is as follows:
Temperature (if supported)
Fanspeed (if supported)
A 5 second exponentially decaying average hash rate
An all time average hash rate
The number of accepted shares
The number of rejected shares
The number of hardware erorrs
The utility defines as the number of shares / minute

The cgminer status line shows:
 TQ: 1  ST: 1  SS: 0  DW: 0  NB: 1  LW: 8  GF: 1  RF: 1

TQ is Total Queued work items.
ST is STaged work items (ready to use).
SS is Stale Shares discarded (detected and not submitted so don't count as rejects)
DW is Discarded Work items (work from block no longer valid to work on)
NB is New Blocks detected on the network
LW is Locally generated Work items
GF is Getwork Fail Occasions (server slow to provide work)
RF is Remote Fail occasions (server slow to accept work)

NOTE: Running intensities above 9 with current hardware is likely to only
diminish return performance even if the hash rate might appear better. A good
starting baseline intensity to try on dedicated miners is 9. Higher values are
there to cope with future improvements in hardware.

---
MULTIPOOL

FAILOVER STRATEGIES WITH MULTIPOOL:
A number of different strategies for dealing with multipool setups are
available. Each has their advantages and disadvantages so multiple strategies
are available by user choice, as per the following list:

FAILOVER:
The default strategy is failover. This means that if you input a number of
pools, it will try to use them as a priority list, moving away from the 1st
to the 2nd, 2nd to 3rd and so on. If any of the earlier pools recover, it will
move back to the higher priority ones.

ROUND ROBIN:
This strategy only moves from one pool to the next when the current one falls
idle and makes no attempt to move otherwise.

ROTATE:
This strategy moves at user-defined intervals from one active pool to the next,
skipping pools that are idle.

LOAD BALANCE:
This strategy sends work in equal amounts to all the pools specified. If any
pool falls idle, the rest will take up the slack keeping the miner busy.

---
LOGGING

cgminer will log to stderr if it detects stderr is being redirected to a file.
To enable logging simply add 2>logfile.txt to your command line and logfile.txt
will contain the logged output at the log level you specify (normal, verbose,
debug etc.)

In other words if you would normally use:
./cgminer -o xxx -u yyy -p zzz
if you use
./cgminer -o xxx -u yyy -p zzz 2>logfile.txt
it will log to a file called logfile.txt and otherwise work the same.

There is also the -m option on linux which will spawn a command of your choice
and pipe the output directly to that command.


If you start cgminer with the --sharelog option, you can get detailed
information for each share found. The argument to the option may be "-" for
standard output (not advisable with the ncurses UI), any valid positive number
for that file descriptor, or a filename.

To log share data to a file named "share.log", you can use either:
./cgminer --sharelog 50 -o xxx -u yyy -p zzz 50>share.log
./cgminer --sharelog share.log -o xxx -u yyy -p zzz

For every share found, data will be logged in a CSV (Comma Separated Value)
format:
    timestamp,disposition,target,pool,dev,thr,sharehash,sharedata
For example (this is wrapped, but it's all on one line for real):
    1335313090,reject,
    ffffffffffffffffffffffffffffffffffffffffffffffffffffffff00000000,
    http://localhost:8337,GPU0,0,
    6f983c918f3299b58febf95ec4d0c7094ed634bc13754553ec34fc3800000000,
    00000001a0980aff4ce4a96d53f4b89a2d5f0e765c978640fe24372a000001c5
    000000004a4366808f81d44f26df3d69d7dc4b3473385930462d9ab707b50498
    f681634a4f1f63d01a0cd43fb338000000000080000000000000000000000000
    0000000000000000000000000000000000000000000000000000000080020000

---
OVERCLOCKING WARNING AND INFORMATION

AS WITH ALL OVERCLOCKING TOOLS YOU ARE ENTIRELY RESPONSIBLE FOR ANY HARM YOU
MAY CAUSE TO YOUR HARDWARE. OVERCLOCKING CAN INVALIDATE WARRANTIES, DAMAGE
HARDWARE AND EVEN CAUSE FIRES. THE AUTHOR ASSUMES NO RESPONSIBILITY FOR ANY
DAMAGE YOU MAY CAUSE OR UNPLANNED CHILDREN THAT MAY OCCUR AS A RESULT.

The GPU monitoring, clocking and fanspeed control incorporated into cgminer
comes through use of the ATI Display Library. As such, it only supports ATI
GPUs. Even if ADL support is successfully built into cgminer, unless the card
and driver supports it, no GPU monitoring/settings will be available.

Cgminer supports initial setting of GPU engine clock speed, memory clock
speed, voltage, fanspeed, and the undocumented powertune feature of 69x0+ GPUs.
The setting passed to cgminer is used by all GPUs unless separate values are
specified. All settings can all be changed within the menu on the fly on a
per-GPU basis.

For example:
--gpu-engine 950 --gpu-memclock 825

will try to set all GPU engine clocks to 950 and all memory clocks to 825,
while:
--gpu-engine 950,945,930,960 --gpu-memclock 300

will try to set the engine clock of card 0 to 950, 1 to 945, 2 to 930, 3 to
960 and all memory clocks to 300.

AUTO MODES:
There are two "auto" modes in cgminer, --auto-fan and --auto-gpu. These can
be used independently of each other and are complementary. Both auto modes
are designed to safely change settings while trying to maintain a target
temperature. By default this is set to 75 degrees C but can be changed with:

--temp-target
e.g.
--temp-target 80
Sets all cards' target temperature to 80 degrees.

--temp-target 75,85
Sets card 0 target temperature to 75, and card 1 to 85 degrees.

AUTO FAN:
e.g.
--auto-fan (implies 85% upper limit)
--gpu-fan 25-85,65 --auto-fan

Fan control in auto fan works off the theory that the minimum possible fan
required to maintain an optimal temperature will use less power, make less
noise, and prolong the life of the fan. In auto-fan mode, the fan speed is
limited to 85% if the temperature is below "overheat" intentionally, as
higher fanspeeds on GPUs do not produce signficantly more cooling, yet
significanly shorten the lifespan of the fans. If temperature reaches the
overheat value, fanspeed will still be increased to 100%. The overheat value
is set to 85 degrees by default and can be changed with:

--temp-overheat
e.g.
--temp-overheat 75,85
Sets card 0 overheat threshold to 75 degrees and card 1 to 85.

AUTO GPU:
e.g.
--auto-gpu --gpu-engine 750-950
--auto-gpu --gpu-engine 750-950,945,700-930,960

GPU control in auto gpu tries to maintain as high a clock speed as possible
while not reaching overheat temperatures. As a lower clock speed limit,
the auto-gpu mode checks the GPU card's "normal" clock speed and will not go
below this unless you have manually set a lower speed in the range. Also,
unless a higher clock speed was specified at startup, it will not raise the
clockspeed. If the temperature climbs, fanspeed is adjusted and optimised
before GPU engine clockspeed is adjusted. If fan speed control is not available
or already optimal, then GPU clock speed is only decreased if it goes over
the target temperature by the hysteresis amount, which is set to 3 by default
and can be changed with:
--temp-hysteresis
If the temperature drops below the target temperature, and engine clock speed
is not at the highest level set at startup, cgminer will raise the clock speed.
If at any time you manually set an even higher clock speed successfully in
cgminer, it will record this value and use it as its new upper limit (and the
same for low clock speeds and lower limits). If the temperature goes over the
cutoff limit (95 degrees by default), cgminer will completely disable the GPU
from mining and it will not be re-enabled unless manually done so. The cutoff
temperature can be changed with:

--temp-cutoff
e.g.
--temp-cutoff 95,105
Sets card 0 cutoff temperature to 95 and card 1 to 105.

--gpu-memdiff -125
This setting will modify the memory speed whenever the GPU clock speed is
modified by --auto-gpu. In this example, it will set the memory speed to
be 125 Mhz lower than the GPU speed. This is useful for some cards like the
6970 which normally don't allow a bigger clock speed difference.


CHANGING SETTINGS:
When setting values, it is important to realise that even though the driver
may report the value was changed successfully, and the new card power profile
information contains the values you set it to, that the card itself may
refuse to use those settings. As the performance profile changes dynamically,
querying the "current" value on the card can be wrong as well. So when changing
values in cgminer, after a pause of 1 second, it will report to you the current
values where you should check that your change has taken. An example is that
6970 reference cards will accept low memory values but refuse to actually run
those lower memory values unless they're within 125 of the engine clock speed.
In that scenario, they usually set their real speed back to their default.

Cgminer reports the so-called "safe" range of whatever it is you are modifying
when you ask to modify it on the fly. However, you can change settings to values
outside this range. Despite this, the card can easily refuse to accept your
changes, or worse, to accept your changes and then silently ignore them. So
there is absolutely to know how far to/from where/to it can set things safely or
otherwise, and there is nothing stopping you from at least trying to set them
outside this range. Being very conscious of these possible failures is why
cgminer will report back the current values for you to examine how exactly the
card has responded. Even within the reported range of accepted values by the
card, it is very easy to crash just about any card, so it cannot use those
values to determine what range to set. You have to provide something meaningful
manually for cgminer to work with through experimentation.

STARTUP / SHUTDOWN:
When cgminer starts up, it tries to read off the current profile information
for clock and fan speeds and stores these values. When quitting cgminer, it
will then try to restore the original values. Changing settings outside of
cgminer while it's running may be reset to the startup cgminer values when
cgminer shuts down because of this.

---

RPC API

If you start cgminer with the "--api-listen" option, it will listen on a
simple TCP/IP socket for single string API requests from the same machine
running cgminer and reply with a string and then close the socket each time
If you add the "--api-network" option, it will accept API requests from any
network attached computer.

You can only access the comands that reply with data in this mode.
By default, you cannot access any privileged command that affects the miner -
you will receive an access denied status message see --api-allow below.

You can specify IP addresses/prefixes that are only allowed to access the API
with the "--api-allow" option e.g. --api-allow W:192.168.0.1,10.0.0/24
will allow 192.168.0.1 or any address matching 10.0.0.*, but nothing else
IP addresses are automatically padded with extra '.0's as needed
Without a /prefix is the same as specifying /32
0/0 means all IP addresses.
The 'W:' on the front gives that address/subnet privileged access to commands
that modify cgminer.
Without it those commands return an access denied status.
Privileged access is checked in the order the IP addresses were supplied to
"--api-allow"
The first match determines the privilege level.
Using the "--api-allow" option overides the "--api-network" option if they
are both specified
With "--api-allow", 127.0.0.1 is not by default given access unless specified

The RPC API request can be either simple text or JSON.

If the request is JSON (starts with '{'), it will reply with a JSON formatted
response, otherwise it replies with text formatted as described further below.

The JSON request format required is '{"command":"CMD","parameter":"PARAM"}'
(though of course parameter is not required for all requests)
where "CMD" is from the "Request" column below and "PARAM" would be e.g.
the CPU/GPU number if required.

An example request in both formats to set GPU 0 fan to 80%:
  gpufan|0,80
  {"command":"gpufan","parameter":"0,80"}

The format of each reply (unless stated otherwise) is a STATUS section
followed by an optional detail section

From API version 1.7 onwards, reply strings in JSON and Text have the
necessary escaping as required to avoid ambiguity - they didn't before 1.7
For JSON the 2 characters '"' and '\' are escaped with a '\' before them
For Text the 4 characters '|' ',' '=' and '\' are escaped the same way

Only user entered information will contain characters that require being
escaped, such as Pool URL, User and Password or the Config save filename,
when they are returned in messages or as their values by the API

For API version 1.4 and later:

The STATUS section is:

 STATUS=X,When=NNN,Code=N,Msg=string,Description=string|

  STATUS=X Where X is one of:
   W - Warning
   I - Informational
   S - Success
   E - Error
   F - Fatal (code bug)

  When=NNN
   Standard long time of request in seconds

  Code=N
   Each unique reply has a unigue Code (See api.c - #define MSG_NNNNNN)

  Msg=string
   Message matching the Code value N

  Description=string
   This defaults to the cgminer version but is the value of --api-description
   if it was specified at runtime.

For API version 1.9:

The list of requests - a (*) means it requires privileged access - and replies are:

 Request       Reply Section  Details
 -------       -------------  -------
 version       VERSION        CGMiner=cgminer version
                              API=API version

 config        CONFIG         Some miner configuration information:
                              GPU Count=N, <- the number of GPUs
                              PGA Count=N, <- the number of PGAs
                              CPU Count=N, <- the number of CPUs
                              Pool Count=N, <- the number of Pools
                              ADL=X, <- Y or N if ADL is compiled in the code
                              ADL in use=X, <- Y or N if any GPU has ADL
                              Strategy=Name, <- the current pool strategy
                              Log Interval=N, <- log interval (--log N)
                              Device Code=GPU ICA | <- spaced list of compiled devices

 summary       SUMMARY        The status summary of the miner
                              e.g. Elapsed=NNN,Found Blocks=N,Getworks=N,...|

 pools         POOLS          The status of each pool
                              e.g. Pool=0,URL=http://pool.com:6311,Status=Alive,...|

 devs          DEVS           Each available GPU, PGA and CPU with their details
                              e.g. GPU=0,Accepted=NN,MHS av=NNN,...,Intensity=D|
                              Last Share Time=NNN, <- standand long time in seconds
                               (or 0 if none) of last accepted share
                              Last Share Pool=N, <- pool number (or -1 if none)
                              Will not report PGAs if PGA mining is disabled
                              Will not report CPUs if CPU mining is disabled

 gpu|N         GPU            The details of a single GPU number N in the same
                              format and details as for DEVS

 pga|N         PGA            The details of a single PGA number N in the same
                              format and details as for DEVS
                              This is only available if PGA mining is enabled
                              Use 'pgacount' or 'config' first to see if there are any

 cpu|N         CPU            The details of a single CPU number N in the same
                              format and details as for DEVS
                              This is only available if CPU mining is enabled
                              Use 'cpucount' or 'config' first to see if there are any

 gpucount      GPUS           Count=N| <- the number of GPUs

 pgacount      PGAS           Count=N| <- the number of PGAs
                              Always returns 0 if PGA mining is disabled

 cpucount      CPUS           Count=N| <- the number of CPUs
                              Always returns 0 if CPU mining is disabled

 switchpool|N (*)
               none           There is no reply section just the STATUS section
                              stating the results of switching pool N to the
                              highest priority (the pool is also enabled)
                              The Msg includes the pool URL

 enablepool|N (*)
               none           There is no reply section just the STATUS section
                              stating the results of enabling pool N
                              The Msg includes the pool URL

 addpool|URL,USR,PASS (*)
               none           There is no reply section just the STATUS section
                              stating the results of attempting to add pool N
                              The Msg includes the pool URL
                              Use '\\' to get a '\' and '\,' to include a comma
                              inside URL, USR or PASS

 disablepool|N (*)
               none           There is no reply section just the STATUS section
                              stating the results of disabling pool N
                              The Msg includes the pool URL

 removepool|N (*)
               none           There is no reply section just the STATUS section
                              stating the results of removing pool N
                              The Msg includes the pool URL
                              N.B. all details for the pool will be lost

 gpuenable|N (*)
               none           There is no reply section just the STATUS section
                              stating the results of the enable request

 gpudisable|N (*)
               none           There is no reply section just the STATUS section
                              stating the results of the disable request

 gpurestart|N (*)
               none           There is no reply section just the STATUS section
                              stating the results of the restart request

 gpuintensity|N,I (*)
               none           There is no reply section just the STATUS section
                              stating the results of setting GPU N intensity to I

 gpumem|N,V (*)
               none           There is no reply section just the STATUS section
                              stating the results of setting GPU N memoryclock to V MHz

 gpuengine|N,V (*)
               none           There is no reply section just the STATUS section
                              stating the results of setting GPU N clock to V MHz

 gpufan|N,V (*)
               none           There is no reply section just the STATUS section
                              stating the results of setting GPU N fan speed to V%

 gpuvddc|N,V (*)
               none           There is no reply section just the STATUS section
                              stating the results of setting GPU N vddc to V

 save|filename (*)
               none           There is no reply section just the STATUS section
                              stating success or failure saving the cgminer config
                              to filename

 quit (*)      none           There is no status section but just a single "BYE"
                              reply before cgminer quits

 notify        NOTIFY         The last status and history count of each devices problem
                              This lists all devices including those not supported
                              by the 'devs' command
                              e.g. NOTIFY=0,Name=GPU,ID=0,Last Well=1332432290,...|

 privileged (*)
               none           There is no reply section just the STATUS section
                              stating an error if you do not have privileged access
                              to the API and success if you do have privilege
                              The command doesn't change anything in cgminer

 pgaenable|N (*)
               none           There is no reply section just the STATUS section
                              stating the results of the enable request
                              You cannot enable a PGA if it's status is not WELL
                              This is only available if PGA mining is enabled

 pgadisable|N (*)
               none           There is no reply section just the STATUS section
                              stating the results of the disable request
                              This is only available if PGA mining is enabled

 devdetails    DEVDETAILS     Each device with a list of their static details
                              This lists all devices including those not supported
                              by the 'devs' command
                              e.g. DEVDETAILS=0,Name=GPU,ID=0,Driver=opencl,...|

 restart (*)   none           There is no status section but just a single "RESTART"
                              reply before cgminer restarts

 stats         STATS          Each device or pool that has 1 or more getworks
                              with a list of stats regarding getwork times
                              The values returned by stats may change in future
                              versions thus would not normally be displayed
                              Device drivers are also able to add stats to the
                              end of the details returned

When you enable, disable or restart a GPU or PGA, you will also get Thread messages
in the cgminer status window

When you switch to a different pool to the current one, you will get a
'Switching to URL' message in the cgminer status windows

Obviously, the JSON format is simply just the names as given before the '='
with the values after the '='

If you enable cgminer debug (-D or --debug) you will also get messages showing
details of the requests received and the replies

There are included 4 program examples for accessing the API:

api-example.php - a php script to access the API
  usAge: php api-example.php command
 by default it sends a 'summary' request to the miner at 127.0.0.1:4028
 If you specify a command it will send that request instead
 You must modify the line "$socket = getsock('127.0.0.1', 4028);" at the
 beginning of "function request($cmd)" to change where it looks for cgminer

API.java/API.class
 a java program to access the API (with source code)
  usAge is: java API command address port
 Any missing or blank parameters are replaced as if you entered:
  java API summary 127.0.0.1 4028

api-example.c - a 'C' program to access the API (with source code)
  usAge: api-example [command [ip/host [port]]]
 again, as above, missing or blank parameters are replaced as if you entered:
  api-example summary 127.0.0.1 4028

miner.php - an example web page to access the API
 This includes buttons and inputs to attempt access to the privileged commands
 Read the top of the file (miner.php) for details of how to tune the display
 and also to use the option to display a multi-rig summary

---

GPU DEVICE ISSUES and use of --gpu-map

GPUs mine with OpenCL software via the GPU device driver. This means you need
to have both an OpenCL SDK installed, and the GPU device driver RUNNING (i.e.
Xorg up and running configured for all devices that will mine on linux etc.)
Meanwhile, the hardware monitoring that cgminer offers for AMD devices relies
on the ATI Display Library (ADL) software to work. OpenCL DOES NOT TALK TO THE
ADL. There is no 100% reliable way to know that OpenCL devices are identical
to the ADL devices, as neither give off the same information. cgminer does its
best to correlate these devices based on the order that OpenCL and ADL numbers
them. It is possible that this will fail for the following reasons:

1. The device order is listed differently by OpenCL and ADL (rare), even if the
number of devices is the same.
2. There are more OpenCL devices than ADL. OpenCL stupidly sees one GPU as two
devices if you have two monitors connected to the one GPU.
3. There are more ADL devices than OpenCL. ADL devices include any ATI GPUs,
including ones that can't mine, like some older R4xxx cards.

To cope with this, the ADVANCED option for --gpu-map is provided with cgminer.
DO NOT USE THIS UNLESS YOU KNOW WHAT YOU ARE DOING. The default will work the
vast majority of the time unless you know you have a problem already.

To get useful information, start cgminer with just the -n option. You will get
output that looks like this:

[2012-04-25 13:17:34] CL Platform 0 vendor: Advanced Micro Devices, Inc.
[2012-04-25 13:17:34] CL Platform 0 name: AMD Accelerated Parallel Processing
[2012-04-25 13:17:34] CL Platform 0 version: OpenCL 1.1 AMD-APP (844.4)
[2012-04-25 13:17:34] Platform 0 devices: 3
[2012-04-25 13:17:34]   0       Tahiti
[2012-04-25 13:17:34]   1       Tahiti
[2012-04-25 13:17:34]   2       Cayman
[2012-04-25 13:17:34] GPU 0 AMD Radeon HD 7900 Series  hardware monitoring enabled
[2012-04-25 13:17:34] GPU 1 AMD Radeon HD 7900 Series  hardware monitoring enabled
[2012-04-25 13:17:34] GPU 2 AMD Radeon HD 6900 Series hardware monitoring enabled
[2012-04-25 13:17:34] 3 GPU devices max detected

Note the number of devices here match, and the order is the same. If devices 1
and 2 were different between Tahiti and Cayman, you could run cgminer with:
--gpu-map 2:1,1:2
And it would swap the monitoring it received from ADL device 1 and put it to
opencl device 2 and vice versa.

If you have 2 monitors connected to the first device it would look like this:

[2012-04-25 13:17:34] Platform 0 devices: 4
[2012-04-25 13:17:34]   0       Tahiti
[2012-04-25 13:17:34]   1       Tahiti
[2012-04-25 13:17:34]   2       Tahiti
[2012-04-25 13:17:34]   3       Cayman
[2012-04-25 13:17:34] GPU 0 AMD Radeon HD 7900 Series  hardware monitoring enabled
[2012-04-25 13:17:34] GPU 1 AMD Radeon HD 7900 Series  hardware monitoring enabled
[2012-04-25 13:17:34] GPU 2 AMD Radeon HD 6900 Series hardware monitoring enabled

To work around this, you would use:
-d 0 -d 2 -d 3 --gpu-map 2:1,3:2

If you have an older card as well as the rest it would look like this:

[2012-04-25 13:17:34] Platform 0 devices: 3
[2012-04-25 13:17:34]   0       Tahiti
[2012-04-25 13:17:34]   1       Tahiti
[2012-04-25 13:17:34]   2       Cayman
[2012-04-25 13:17:34] GPU 0 AMD Radeon HD 4500 Series  hardware monitoring enabled
[2012-04-25 13:17:34] GPU 1 AMD Radeon HD 7900 Series  hardware monitoring enabled
[2012-04-25 13:17:34] GPU 2 AMD Radeon HD 7900 Series  hardware monitoring enabled
[2012-04-25 13:17:34] GPU 3 AMD Radeon HD 6900 Series hardware monitoring enabled

To work around this you would use:
--gpu-map 0:1,1:2,2:3


---

FAQ

Q: cgminer segfaults when I change my shell window size.
A: Older versions of libncurses have a bug to do with refreshing a window
after a size change. Upgrading to a new version of curses will fix it.

Q: Can I mine on servers from different networks (eg smartcoin and bitcoin) at
the same time?
A: No, cgminer keeps a database of the block it's working on to ensure it does
not work on stale blocks, and having different blocks from two networks would
make it invalidate the work from each other.

Q: Can I change the intensity settings individually for each GPU?
A: Yes, pass a list separated by commas such as -I d,4,9,9

Q: Can I put multiple pools in the config file?
A: Yes, check the example.conf file. Alternatively, set up everything either on
the command line or via the menu after startup and choose settings->write
config file and the file will be loaded one each startup.

Q: The build fails with gcc is unable to build a binary.
A: Remove the "-march=native" component of your CFLAGS as your version of gcc
does not support it.

Q: The CPU usage is high.
A: The ATI drivers after 11.6 have a bug that makes them consume 100% of one
CPU core unnecessarily so downgrade to 11.6. Binding cgminer to one CPU core on
windows can minimise it to 100% (instead of more than one core). Driver version
11.11 on linux and 11.12 on windows appear to have fixed this issue. Note that
later drivers may have an apparent return of high CPU usage. Try
'export GPU_USE_SYNC_OBJECTS=1' on Linux before starting cgminer.

Q: Can you implement feature X?
A: I can, but time is limited, and people who donate are more likely to get
their feature requests implemented.

Q: My GPU hangs and I have to reboot it to get it going again?
A: The more aggressively the mining software uses your GPU, the less overclock
you will be able to run. You are more likely to hit your limits with cgminer
and you will find you may need to overclock your GPU less aggressively. The
software cannot be responsible and make your GPU hang directly. If you simply
cannot get it to ever stop hanging, try decreasing the intensity, and if even
that fails, try changing to the poclbm kernel with -k poclbm, though you will
sacrifice performance. cgminer is designed to try and safely restart GPUs as
much as possible, but NOT if that restart might actually crash the rest of the
GPUs mining, or even the machine. It tries to restart them with a separate
thread and if that separate thread dies, it gives up trying to restart any more
GPUs.

Q: Work keeps going to my backup pool even though my primary pool hasn't
failed?
A: Cgminer checks for conditions where the primary pool is lagging and will
pass some work to the backup servers under those conditions. The reason for
doing this is to try its absolute best to keep the GPUs working on something
useful and not risk idle periods. You can disable this behaviour with the
option --failover-only.

Q: Is this a virus?
A: Cgminer is being packaged with other trojan scripts and some antivirus
software is falsely accusing cgminer.exe as being the actual virus, rather
than whatever it is being packaged with. If you installed cgminer yourself,
then you do not have a virus on your computer. Complain to your antivirus
software company.

Q: Can you modify the display to include more of one thing in the output and
less of another, or can you change the quiet mode or can you add yet another
output mode?
A: Everyone will always have their own view of what's important to monitor.
The defaults are very sane and I have very little interest in changing this
any further.

Q: Can you change the autofan/autogpu to change speeds in a different manner?
A: The defaults are sane and safe. I'm not interested in changing them
further. The starting fan speed is set to 50% in auto-fan mode as a safety
precaution.

Q: Why is my efficiency above/below 100%?
A: Efficiency simply means how many shares you return for the amount of work
you request. It does not correlate with efficient use of your hardware, and is
a measure of a combination of hardware speed, block luck, pool design and other
factors

Q: What are the best parameters to pass for X pool/hardware/device.
A: Virtually always, the DEFAULT parameters give the best results. Most user
defined settings lead to worse performance. The ONLY thing most users should
need to set is the Intensity.

Q: What happened to CPU mining?
A: Being increasingly irrelevant for most users, and a maintenance issue, it is
no longer under active development and will not be supported unless someone
steps up to help maintain it. No binary builds supporting CPU mining will be
released but CPU mining can be built into cgminer when it is compiled.

Q: I upgraded cgminer version and my hashrate suddenly dropped!
A: No, you upgraded your SDK version unwittingly between upgrades of cgminer
and that caused  your hashrate to drop. See the next question.

Q: I upgraded my ATI driver/SDK/cgminer and my hashrate suddenly dropped!
A: The hashrate performance in cgminer is tied to the version of the ATI SDK
that is installed only for the very first time cgminer is run. This generates
binaries that are used by the GPU every time after that. Any upgrades to the
SDK after that time will have no effect on the binaries. However, if you
install a fresh version of cgminer, and have since upgraded your SDK, new
binaries will be built. It is known that the 2.6 ATI SDK has a huge hashrate
penalty on generating new binaries. It is recommended to not use this SDK at
this time unless you are using an ATI 7xxx card that needs it.

Q: Which ATI SDK is the best for cgminer?
A: At the moment, versions 2.4 and 2.5 work the best. If you are forced to use
the 2.6 SDK, the phatk kernel will perform poorly, while the diablo or my
custom modified poclbm kernel are optimised for it.

Q: I have multiple SDKs installed, can I choose which one it uses?
A: Run cgminer with the -n option and it will list all the platforms currently
installed. Then you can tell cgminer which platform to use with --gpu-platform.

Q: GUI version?
A: No. The RPC interface makes it possible for someone else to write one
though.

Q: I'm having an issue. What debugging information should I provide?
A: Start cgminer with your regular commands and add -D -T --verbose and provide
the full startup output and a summary of your hardware, operating system, ATI
driver version and ATI stream version.

Q: cgminer reports no devices or only one device on startup on Linux although
I have multiple devices and drivers+SDK installed properly?
A: Try 'export DISPLAY=:0" before running cgminer.

Q: My network gets slower and slower and then dies for a minute?
A; Try the --net-delay option.

Q: How do I tune for p2pool?
A: p2pool has very rapid expiration of work and new blocks, it is suggested you
decrease intensity by 1 from your optimal value, and decrease GPU threads to 1
with -g 1.

Q: Are kernels from other mining software useable in cgminer?
A: No, the APIs are slightly different between the different software and they
will not work.

Q: I run PHP on windows to access the API with the example miner.php. Why does
it fail when php is installed properly but I only get errors about Sockets not
working in the logs?
A: http://us.php.net/manual/en/sockets.installation.php

Q: What is a PGA?
A: At the moment, cgminer supports 3 FPGA's: Icarus, Ztex and BitForce.
They are Field-Programmable Gate Arrays that have been programmed to do Bitcoin
mining. Since the acronym needs to be only 3 characters, the "Field-" part has
been skipped.

---

This code is provided entirely free of charge by the programmer in his spare
time so donations would be greatly appreciated. Please consider donating to the
address below.

Con Kolivas <kernel@kolivas.org>
15qSxP1SQcUX3o4nhkfdbgyoWEFMomJ4rZ