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doc: update FAQ, rename to FAQ.md.

nfactor-troky
Noel Maersk 11 years ago
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      README.md
  2. 154
      doc/FAQ
  3. 161
      doc/FAQ.md

2
README.md
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@ -24,7 +24,7 @@ License: GPLv3. See `COPYING` for details. @@ -24,7 +24,7 @@ License: GPLv3. See `COPYING` for details.
Documentation is available in directory `doc`. For details on several topics, see:
* `API` for the RPC API specification;
* `FAQ` for frequently asked questions;
* `FAQ.md` for frequently asked questions;
* `GPU` for semi-obsolete information on GPU configuration options and mining SHA256d-based coins;
* `KERNEL.md` for OpenCL kernel-related information;
* `MINING.md` for how to find the right balance in GPU configuration to mine Scrypt-based coins effectively;

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doc/FAQ
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FAQ
Q: Can I mine on servers from different networks (eg smartcoin and bitcoin) at
the same time?
A: No, sgminer 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 configure sgminer to mine with different login credentials or pools
for each separate device?
A: No.
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: sgminer 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: sgminer is being packaged with other trojan scripts and some antivirus
software is falsely accusing sgminer.exe as being the actual virus, rather
than whatever it is being packaged with. If you installed sgminer 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 sgminer
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 sgminer 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 sgminer. 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 in the
bug report?
A: Start sgminer with your regular commands and add -D -T --verbose and provide
the full startup output and a summary of your hardware, operating system, AMD
driver version and AMD APP SDK version (if installed separately).
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 sgminer can do on linux.
Q: Can I mine with sgminer on a MAC?
A: sgminer 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.
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.
Q: Are OpenCL kernels from other mining software useable in sgminer?
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: Can I mine scrypt with FPGAs or ASICs?
A: As of Jan 15 2014, 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 sgminer 2.8.0+, if a pool has stratum support, sgminer
will automatically detect it and switch to the support as advertised if it can.
If you input the stratum port directly into your configuration, or use the
special prefix "stratum+tcp://" instead of "http://", sgminer 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 sgminer 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 sgminer is as multiples of difficulty 1 shares.
Q: Can I make a donation?
A: Yes, see AUTHORS.md for authors' donation addresses.
Q: What should my Work Utility (WU) be?
A: Work utility is the product of hashrate * luck and only stabilises over a
very long period of time. Assuming all your work is valid work, bitcoin mining
should produce a work utility of approximately 1 per 71.6MH. This means at
5GH you should have a WU of 5000 / 71.6 or ~ 69. You cannot make your machine
do "better WU" than this - it is luck related. However you can make it much
worse if your machine produces a lot of hardware errors producing invalid work.

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# FAQ
Q: Can I mine on servers from different networks (eg litecoin and
dogecoin) at the same time?
A: No, sgminer 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 configure sgminer to mine with different login credentials or
pools for each separate device?
A: No.
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`.
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: sgminer 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: sgminer is being packaged with other trojan
scripts and some antivirus software is falsely accusing sgminer.exe as
being the actual virus, rather than whatever it is being packaged with.
If you had built sgminer 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 shipped NCurses TUI is intentionally ascetic, and is only
provided as a fallback. It is recomended to use an API client if you
want to customise the display.
Q: GUI version?
A: No. The API makes it possible for someone else to write one though.
Q: What are the best parameters to pass for pool / hardware / device?
A: See `doc/MINING.md` in your source distribution directory, or
[doc/MINING.md](https://github.com/veox/sgminer/blob/master/doc/MINING.md]
for an online version. Note that the latter is for the latest
development version, and arguments listed there are not necessarily
available in your local version.
Q: Is CPU mining supported?
A: No. Consider using [cpuminer](https://github.com/pooler/cpuminer).
Q: I'm having an issue. What debugging information should I provide in
the bug report?
A: See `doc/BUGS.md` in your source distribution directory, or
[doc/BUGS.md](https://github.com/veox/sgminer/blob/master/doc/BUGS.md]
for an online version.
Q: Why don't you provide binaries?
A: Binaries are a hassle to maintain. On Linux, they should be provided
by your distribution's package manager anyway. Runnning an unoptimised
binary gives a minor performance penalty. Running binaries from
untrusted providers is a security risk. There has not been sufficient
community interest to provide distributed determininstic builds.
Q: Is it better to mine on Linux or Windows?
A: It comes down to choice of operating system for their various
features. Linux offers specialised mining distributions, much better
long term stability, remote monitoring and security, while Windows
offers overclocking tools that can achieve much more than sgminer can do
on Linux. YMMV.
Q: Can I mine with sgminer on a Mac?
A: sgminer 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 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.
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, decrease `scantime` and `expiry`,
and/or decrease GPU threads to 1 with `-g 1`. It is also recommended to
use `--failover-only` since the work is effectively a separate
blockchain.
Q: Are OpenCL kernels from other mining software usable in sgminer?
A: Most often no.
Q: How do I add my own kernel?
A: See `doc/KERNEL.md` in your source distribution directory, or
[doc/KERNEL.md](https://github.com/veox/sgminer/blob/master/doc/KERNEL.md]
for an online version.
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: Will sgminer support FPGAs or ASICs?
A: No. sgminer will only support GPUs. It is bad software design
practice to try and support every gadget out there. Developers
for dedicated hardware products are better off creating standalone
software.
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. If a pool has stratum support (and most public ones do),
sgminer will automatically detect it and switch to the support as
advertised if it can. If you input the stratum port directly into your
configuration, or use the special prefix `stratum+tcp://` instead of
`http://`, sgminer 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 sgminer 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 sgminer is as multiples of difficulty 1
shares.
Q: Can I make a donation?
A: Yes, see AUTHORS.md for authors' donation addresses.
Q: What is Work Utility (WU)?
A: Work utility is the product of hashrate * luck and only stabilises
over a very long period of time. Luck includes hardware error rate,
share reject rate and other parameters. Therefore, it is often a better
indicator of hardware or software misconfiguration.
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