cgminer 3.1.1 README
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This is the cgminer 3.1.1 README.txt.
This is a multi-threaded multi-pool GPU, FPGA and ASIC 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 <email@example.com> 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. SEE ALSO ASIC-README, FGPA-README, GPU-README AND SCRYPT-README FOR MORE INFORMATION ON EACH. --- 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: cgminer -o http://pool:port -u username -p password Multiple pools: cgminer -o http://pool1:port -u pool1username -p pool1password -o http://pool2:port -u pool2usernmae -p pool2password Single pool with a standard http proxy, regular desktop: cgminer -o "http:proxy:port|http://pool:port" -u username -p password Single pool with a socks5 proxy, regular desktop: cgminer -o "socks5:proxy:port|http://pool:port" -u username -p password Single pool with stratum protocol support: cgminer -o stratum+tcp://pool:port -u username -p password The list of proxy types are: http: standard http 1.1 proxy http0: http 1.0 proxy socks4: socks4 proxy socks5: socks5 proxy socks4a: socks4a proxy socks5h: socks5 proxy using a hostname If you compile cgminer with a version of CURL before 7.19.4 then some of the above will not be available. All are available since CURL version 7.19.4 If you specify the --socks-proxy option to cgminer, it will only be applied to all pools that don't specify their own proxy setting like above --- BUILDING CGMINER 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 libtool http://www.gnu.org/software/libtool/ jansson http://www.digip.org/jansson/ (jansson is included in-tree and not necessary) 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 ASIC+FPGA auto-detection and is linux only) libusb headers (This is only required for ASIC+FPGA support) CGMiner specific configuration options: --disable-opencl Override detection and disable building with opencl --disable-adl Override detection and disable building with adl --enable-bflsc Compile support for BFL ASICs (default disabled) --enable-bitforce Compile support for BitForce FPGAs(default disabled) --enable-icarus Compile support for Icarus Board(default disabled) --enable-modminer Compile support for ModMiner FPGAs(default disabled) --enable-ztex Compile support for Ztex Board(default disabled) --enable-avalon Compile support for Avalon (default disabled) --enable-scrypt Compile support for scrypt litecoin mining (default disabled) --without-curses Compile support for curses TUI (default enabled) --without-libudev Autodetect FPGAs using libudev (default enabled) Basic *nix build instructions: To actually build: ./autogen.sh # only needed if building from git repo CFLAGS="-O2 -Wall -march=native" ./configure <options> No installation is necessary. You may run cgminer from the build directory directly. 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-groups API one letter groups G:cmd:cmd[,P:cmd:*...] See API-README for usage --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 --balance Change multipool strategy from failover to even share balance --benchmark Run cgminer in benchmark mode - produces no shares --compact Use compact display without per device statistics --debug|-D Enable debug output --disable-rejecting Automatically disable pools that continually reject shares --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 --fix-protocol Do not redirect to a different getwork protocol (eg. stratum) --hotplug <arg> Set hotplug check time to <arg> seconds (0=never default: 5) - only with libusb --kernel-path|-K <arg> Specify a path to where bitstream and kernel files are (default: "/usr/local/bin") --load-balance Change multipool strategy from failover to efficiency based 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-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 --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) --scrypt Use the scrypt algorithm for mining (litecoin only) --sharelog <arg> Append share log to file --shares <arg> Quit after mining N shares (default: unlimited) --socks-proxy <arg> Set socks4 proxy (host:port) for all pools without a proxy specified --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 --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 SCRYPT only options: --lookup-gap <arg> Set GPU lookup gap for scrypt mining, comma separated --shaders <arg> GPU shaders per card for tuning scrypt, comma separated --thread-concurrency <arg> Set GPU thread concurrency for scrypt mining, comma separated See SCRYPT-README for more information regarding litecoin mining. ASIC and FPGA mining boards (BFL ASIC, BitForce, Icarus, ModMiner, Ztex) only options: Cgminer will automatically find all of your BFL ASIC, BitForce FPGAs, ModMiner FPGAs or Ztex FPGAs The --usb option can restrict how many BFL ASIC, BitForce FPGAs or ModMiner FPGAs it finds: --usb 1:2,1:3,1:4,1:* or --usb BAS:1,BFL:1,MMQ:0 or --usb :10 You can only use one of the above 3 The first version --usb 1:2,1:3,1:4,1:* allows you to select which devices to mine on with a list of USB bus_number:device_address All other USB devices will be ignored Hotplug will also only look at the devices matching the list specified and find nothing new if they are all in use You can specify just the USB bus_number to find all devices like 1:* which means any devices on USB bus_number 1 This is useful if you unplug a device then plug it back in the same port, it usually reappears with the same bus_number but a different device_address You can see the list of all USB devices on linux with 'sudo lsusb' Cgminer will list the recognised USB devices with the '--usb-dump 0' option The '--usb-dump N' option with a value of N greater than 0 will dump a lot of details about each recognised USB device If you wish to see all USB devices, include the --usb-list-all option The second version --usb BAS:1,BFL:1,MMQ:0 allows you to specify how many devices to choose based on each device driver cgminer has - there are currently 3 USB drivers: BAS, BFL & MMQ N.B. you can only specify which device driver to limit, not the type of each device, e.g. with BAS:n you can limit how many BFL ASIC devices will be checked, but you cannot limit the number of each type of BFL ASIC Also note that the MMQ count is the number of MMQ backplanes you have not the number of MMQ FPGAs The third version --usb :10 means only use a maximum of 10 devices of any supported USB devices Once cgminer has 10 devices it will not configure any more and hotplug will not scan for any more If one of the 10 devices stops working, hotplug - if enabled, as is default - will scan normally again until it has 10 devices --scan-serial|-S <arg> Serial port to probe for Icarus mining device This option is only for Icarus bitstream FPGAs By default, cgminer will scan for autodetected Icarus 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 Icarus device) The official supplied binaries are compiled with support for all FPGAs. To force the code to only attempt detection with a specific driver, prepend the argument with the driver name followed by a colon. For example, "icarus:/dev/ttyUSB0" or using the short name: "ica:/dev/ttyUSB0" This option not longer matters since Icarus is the only serial-USB device that uses it For other FPGA details see the FPGA-README --- 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 [F]ailover only disabled [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 [W]rite config file [C]gminer restart D gives you: [N]ormal [C]lear [S]ilent mode (disable all output) [D]ebug:off [P]er-device:off [Q]uiet:off [V]erbose:off [R]PC debug:off [W]orkTime details:off co[M]pact: off [L]og interval:5 Q quits the application. G gives you something like: GPU 0: [124.2 / 191.3 Mh/s] [A:77 R:33 HW:0 U:1.73/m WU 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 The running log shows output like this: [2012-10-12 18:02:20] Accepted f0c05469 Diff 1/1 GPU 0 pool 1 [2012-10-12 18:02:22] Accepted 218ac982 Diff 7/1 GPU 1 pool 1 [2012-10-12 18:02:23] Accepted d8300795 Diff 1/1 GPU 3 pool 1 [2012-10-12 18:02:24] Accepted 122c1ff1 Diff 14/1 GPU 1 pool 1 The 8 byte hex value are the 2nd 8 bytes of the share being submitted to the pool. The 2 diff values are the actual difficulty target that share reached followed by the difficulty target the pool is currently asking for. --- 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 | A:729 R:8 HW:0 U:22.53/m WU:22.53/m Each column is as follows: 5s: A 5 second exponentially decaying average hash rate avg: An all time average hash rate A: The number of Accepted shares R: The number of Rejected shares HW: The number of HardWare errors U: The Utility defined as the number of shares / minute WU: The Work Utility defined as the number of diff1 shares work / minute (accepted or rejected). 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: ST: 1 SS: 0 NB: 1 LW: 8 GF: 1 RF: 1 WU:4.4/m ST is STaged work items (ready to use). SS is Stale Shares discarded (detected and not submitted so don't count as rejects) 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) WU is Work Utility (Rate of difficulty 1 shares solved per minute) The block display shows: Block: 0074c5e482e34a506d2a051a... Started: [17:17:22] Best share: 2.71K This shows a short stretch of the current block, when the new block started, and the all time best difficulty share you've found since starting cgminer this time. --- 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 to all the pools to maintain optimum load. The most efficient pools will tend to get a lot more shares. If any pool falls idle, the rest will tend to take up the slack keeping the miner busy. BALANCE: This strategy monitors the amount of difficulty 1 shares solved for each pool and uses it to try to end up doing the same amount of work for all pools. --- 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. The WorkTime details 'debug' option adds details on the end of each line displayed for Accepted or Rejected work done. An example would be: <-00000059.ed4834a3 M:X D:1.0 G:17:02:38:0.405 C:1.855 (2.995) W:3.440 (0.000) S:0.461 R:17:02:47 The first 2 hex codes are the previous block hash, the rest are reported in seconds unless stated otherwise: The previous hash is followed by the getwork mode used M:X where X is one of P:Pool, T:Test Pool, L:LP or B:Benchmark, then D:d.ddd is the difficulty required to get a share from the work, then G:hh:mm:ss:n.nnn, which is when the getwork or LP was sent to the pool and the n.nnn is how long it took to reply, followed by 'O' on it's own if it is an original getwork, or 'C:n.nnn' if it was a clone with n.nnn stating how long after the work was recieved that it was cloned, (m.mmm) is how long from when the original work was received until work started, W:n.nnn is how long the work took to process until it was ready to submit, (m.mmm) is how long from ready to submit to actually doing the submit, this is usually 0.000 unless there was a problem with submitting the work, S:n.nnn is how long it took to submit the completed work and await the reply, R:hh:mm:ss is the actual time the work submit reply was received 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 --- RPC API For RPC API details see the API-README file --- 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 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: 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: 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. They seem to be flagging even source code now from cgminer as viruses, even though text source files can't do anything by themself. 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: 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 for GPUs. 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. No binary builds supporting CPU mining will be released. Virtually all remaining users of CPU mining are as back ends for illegal botnets. The main reason cgminer is being inappopriately tagged as a virus by antivirus software is due to the trojans packaging a CPU mining capable version of it. There is no longer ANY CPU mining code in cgminer. If you are mining bitcoin with CPU today, you are spending 1000x more in electricity costs than you are earning in bitcoin. 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: Why don't you provide win64 builds? A: Win32 builds work everywhere and there is precisely zero advantage to a 64 bit build on windows. Q: Is it faster to mine on windows or linux? A: It makes no difference. It comes down to choice of operating system for their various features. Linux offers much better long term stability and remote monitoring and security, while windows offers you overclocking tools that can achieve much more than cgminer can do on linux. Q: Can I mine with cgminer on a MAC? A: cgminer will compile on OSX, but the performance of GPU mining is compromised due to the opencl implementation on OSX, there is no temperature or fanspeed monitoring, and the cooling design of most MACs, despite having powerful GPUs, will usually not cope with constant usage leading to a high risk of thermal damage. It is highly recommended not to mine on a MAC unless it is to a USB device. Q: I'm trying to mine litecoin but cgminer shows MH values instead of kH and submits no shares? A: Add the --scrypt parameter. Q: I switch users on windows and my mining stops working? A: That's correct, it does. It's a permissions issue that there is no known fix for due to monitoring of GPU fanspeeds and temperatures. If you disable the monitoring with --no-adl it should switch okay. 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. It is also recommended to use --failover-only since the work is effectively like a different block chain. If mining with a minirig, it is worth adding the --bfl-range option. Q: Are OpenCL 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 4 FPGAs: BitForce, Icarus, ModMiner, and Ztex. 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. Q: What is an ASIC? A: Cgminer currently supports 2 ASICs: Avalon and BitForce SC devices. They are Application Specify Integrated Circuit devices and provide the highest performance per unit power due to being dedicated to only one purpose. Q: How do I get my Icarus/Lancelot/Cairnsmore device to auto-recognise? A: On linux, if the /dev/ttyUSB* devices don't automatically appear, the only thing that needs to be done is to load the driver for them: Icarus: sudo modprobe pl2303 vendor=0x067b product=0x230 Lancelot: sudo modprobe ftdi_sio vendor=0x0403 product=0x6001 Cairnsmore: sudo modprobe ftdi_sio product=0x8350 vendor=0x0403 On windows you must install the pl2303 or ftdi driver required for the device pl2303: http://prolificusa.com/pl-2303hx-drivers/ ftdi: http://www.ftdichip.com/Drivers/VCP.htm Q: On linux I can see the /dev/ttyUSB* devices for my Icarus FPGAs, but cgminer can't mine on them A: Make sure you have the required priviledges to access the /dev/ttyUSB* devices: sudo ls -las /dev/ttyUSB* will give output like: 0 crw-rw---- 1 root dialout 188, 0 2012-09-11 13:49 /dev/ttyUSB0 This means your account must have the group 'dialout' or root priviledges To permanently give your account the 'dialout' group: sudo usermod -G dialout -a `whoami` Then logout and back in again Q: Can I mine scrypt with FPGAs or ASICs? A: No. Q: What is stratum and how do I use it? A: Stratum is a protocol designed for pooled mining in such a way as to minimise the amount of network communications, yet scale to hardware of any speed. With versions of cgminer 2.8.0+, if a pool has stratum support, cgminer will automatically detect it and switch to the support as advertised if it can. Stratum uses direct TCP connections to the pool and thus it will NOT currently work through a http proxy but will work via a socks proxy if you need to use one. If you input the stratum port directly into your configuration, or use the special prefix "stratum+tcp://" instead of "http://", cgminer will ONLY try to use stratum protocol mining. The advantages of stratum to the miner are no delays in getting more work for the miner, less rejects across block changes, and far less network communications for the same amount of mining hashrate. If you do NOT wish cgminer to automatically switch to stratum protocol even if it is detected, add the --fix-protocol option. Q: Why don't the statistics add up: Accepted, Rejected, Stale, Hardware Errors, Diff1 Work, etc. when mining greater than 1 difficulty shares? A: As an example, if you look at 'Difficulty Accepted' in the RPC API, the number of difficulty shares accepted does not usually exactly equal the amount of work done to find them. If you are mining at 8 difficulty, then you would expect on average to find one 8 difficulty share, per 8 single difficulty shares found. However, the number is actually random and converges over time, it is an average, not an exact value, thus you may find more or less than the expected average. Q: Why do the scrypt diffs not match with the current difficulty target? A: The current scrypt block difficulty is expressed in terms of how many multiples of the BTC difficulty it currently is (eg 28) whereas the shares of "difficulty 1" are actually 65536 times smaller than the BTC ones. The diff expressed by cgminer is as multiples of difficulty 1 shares. Q: Can I make a donation in litecoin? A: Yes, see SCRYPT-README for the address, but the author prefers bitcoin if possible. --- 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 <firstname.lastname@example.org> 15qSxP1SQcUX3o4nhkfdbgyoWEFMomJ4rZ