How to get number of cores in Win32?

Question

I\'m writing a program in C on windows that needs to run as many threads as available cores. But I dont know how to get the number of cores. Any ideas?

Answer 1

Type "cmd" on windows startup and open "cmd.exe". Now type in the following command:

WMIC CPU Get /Format:List

You will find the entries like - "NumberOfCores" and "NumberOfLogicalProcessors". Typically the logical-processors are achieved by threading. Therefore the relation would typically go like;

NumberOfLogicalProcessors = NumberOfCores * Number-of-Threads-per-Core.

Since each core serves a processing-unit, therefore with threading, logical-processing-unit is realized in real space.

More info here.