finding number of cores in a multi-core processor

Is there a way to find the number of cores in a multi-core system using a command-line, or library function? I want to do this because I want to re-write my programs to be multithreaded and take advantage of multiple cores. Specifically I'm coding in Java, but anything would help. Thanks.

-da

C++0x will provide std::thread::get_hardware_concurrency(). That probably doesn't help you, though.

Not a C++ question, moving to Tech.


Try java.lang.Runtime.availableProcessors().

In windows use GetSystemInfo()

Related thread: Maximum concurrency