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add --cuda-usleep flag to optionally usleep between search iterations #2281

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add --cuda-usleep flag to optionally usleep between search iterations #2281

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3 changes: 3 additions & 0 deletions ethminer/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -344,6 +344,9 @@ class MinerCLI
app.add_option("--cuda-streams,--cu-streams", m_CUSettings.streams, "", true)
->check(CLI::Range(1, 99));

app.add_option("--cuda-usleep,--cu-usleep", m_CUSettings.usleep, "", true)
->check(CLI::Range(-1, 1000000));
Comment on lines +347 to +348
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It's probably worth improving the documentation on this, just to make it more clear what this actually does.

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app.add_option("--cuda-usleep,--cu-usleep", m_CUSettings.usleep, "", true)
->check(CLI::Range(-1, 1000000));
// adds an optional usleep between batches. Can be used to slow down mining.
app.add_option("--cuda-usleep,--cu-usleep", m_CUSettings.usleep, "Sleep time in μs between batches (default: no sleep)", true)
->check(CLI::Range(-1, 1000000));


#endif

#if ETH_ETHASHCPU
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5 changes: 5 additions & 0 deletions libethash-cuda/CUDAMiner.cpp
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Expand Up @@ -402,8 +402,13 @@ void CUDAMiner::search(
// restart the stream on the next batch of nonces
// unless we are done for this round.
if (!done)
{
if (m_settings.usleep >= 0) {
usleep(m_settings.usleep);
}
run_ethash_search(
m_settings.gridSize, m_settings.blockSize, stream, &buffer, start_nonce);
}

if (found_count)
{
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1 change: 1 addition & 0 deletions libethcore/Miner.h
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Expand Up @@ -101,6 +101,7 @@ struct CUSettings : public MinerSettings
unsigned schedule = 4;
unsigned gridSize = 8192;
unsigned blockSize = 128;
int usleep = -1;
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C and C++ are annoying languages, and even though int is usually 32-bits large, on some platforms, it can be 16-bits, so it's better to use one of the types in <cstdint> instead.

The following should work if you include #include <cstdint> at the top of the file. Alternatively, you could replace the CLI::Range(-1, 1000000)) to a smaller range that will fit in a int16 like CLI::Range(-1, 10000)).

Suggested change
int usleep = -1;
int_fast32_t usleep = -1;

};

// Holds settings for OpenCL Miner
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