How many cores do I have?

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Programmatically find the number of cores on a machine

I have a multi-threaded C++ program that runs on Windows, MacOS and Linux. Is there an easy way to find out how many cores the machine on which I am running currently has? My system runs best when it has 1 thread for each core.

score 3 · Answer 1 · answered Dec 04 '10 at 21:43

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Use boost::thread::hardware_concurrency() or std::thread::hardware_concurrency() if you have a C++0x compiler.

answered Dec 04 '10 at 21:43

Yakov Galka

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score 2 · Accepted Answer · edited May 23 '17 at 12:11

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I believe this question may contain your answer:

Programmatically find the number of cores on a machine

Edit: I just voted up ybungalobill's answer. I love boost!

edited May 23 '17 at 12:11

Community

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answered Dec 04 '10 at 21:44

ClosureCowboy

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score 0 · Answer 3 · answered Dec 04 '10 at 21:45

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On a linux system, cat /proc/cpuinfo and parse the output is one way. Dunno if it's the most efficient or not.

answered Dec 04 '10 at 21:45

Leonard

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How many cores do I have?

3 Answers3