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add a --max-concurrency flag

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It sets the max number of threads to use for a parallel job.
This is different that the number of total threads, since monero
binaries typically start a lot of them.
This commit is contained in:
moneromooo-monero
2016-04-28 20:25:33 +01:00
parent bdb93cbf3d
commit 513a658c87
8 changed files with 47 additions and 7 deletions
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23
src/common/util.cpp
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@@ -422,4 +422,27 @@ std::string get_nix_version_display_string()
umask(mode);
#endif
}
namespace
{
boost::mutex max_concurrency_lock;
unsigned max_concurrency = boost::thread::hardware_concurrency();
}
void set_max_concurrency(unsigned n)
{
if (n < 1)
n = boost::thread::hardware_concurrency();
unsigned hwc = boost::thread::hardware_concurrency();
if (n > hwc)
n = hwc;
boost::lock_guard<boost::mutex> lock(max_concurrency_lock);
max_concurrency = n;
}
unsigned get_max_concurrency()
{
boost::lock_guard<boost::mutex> lock(max_concurrency_lock);
return max_concurrency;
}
}