bfgminer/README

This is a multi-threaded multi-pool CPU and GPU miner for bitcoin.

License: GPLv2.  See COPYING for details.

Dependencies:
	libcurl			http://curl.haxx.se/libcurl/
	jansson			http://www.digip.org/jansson/
	(jansson is included in-tree and not necessary)
	libncurses5-dev (or libpdcurses on WIN32)

Basic *nix build instructions:
	To build with GPU mining support:
	Install AMD APP sdk, latest version - there is 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)

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="-O3 -Wall -march=native" ./configure
	or if you haven't installed the ati files in system locations:
	CFLAGS="-O3 -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 (on Fedora 13; requires mingw32):
	./autogen.sh	# only needed if building from git repo
	rm -f mingw32-config.cache
	MINGW32_CFLAGS="-O3 -Wall -msse2" mingw32-configure
	make
	./mknsis.sh
	
Native WIN32 build instructions (on mingw32, on windows):
	Install AMD APP sdk, latest version
	(Do NOT install the ati amd sdk if you are on nvidia)
	Install mingw32
	Install libcurl, copy libcurl.m4 into /mingw/share/aclocal
	Run:
	autoreconf -fvi
	CFLAGS="-O3 -Wall -msse2 -I<path to AMD APP include>" LDFLAGS="-L<path to AMD APP lib/x86>" ./configure
	make

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


EXECUTIVE SUMMARY ON USAGE:

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 8

Multiple pool, dedicated miner:

cgminer -o http://pool1:port -u pool1username -p pool1password -o http://pool2:port -u pool2usernmae -p pool2password -I 8


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):204.4  (avg):203.1 Mh/s] [Q:56  A:51  R:4  HW:0  E:91%  U:2.47/m]

Each column is as follows:
A 5 second exponentially decaying average hash rate
An all time average hash rate
The number of requested work items
The number of accepted shares
The number of rejected shares
The number of hardware erorrs
The efficiency defined as the accepted shares / requested work
The utility defines as the number of shares / minute

The cgminer status line shows:
 TQ: 1  ST: 1  LS: 0  SS: 0  DW: 0  NB: 1  LW: 8  LO: 1  RF: 1  I: 2

TQ is Total Queued work items.
ST is STaged work items (ready to use).
LS is Longpoll Staged work items (mandatory new work)
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 (during slow server providing work)
LO is Local generation Occasions (server slow to provide work)
RF is Remote Fail occasions (server slow to accept work)
I is current Intensity (changes in dynamic mode).

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 8. Higher values are
there to cope with future improvements in hardware.


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.