How to run different threads on different cores? [duplicate]

Question

Possible Duplicate:
how to set CPU affinity of a particular pthread?

I am writing a c++ program, using g++ compiler in Ubuntu. I have 4 threads in my program and 4 cores on my CPU. I want to be sure that each thread will be run on a different core. I am rarely familiar with pthread.

Answer 1

See sched_setaffinity function: http://manpages.courier-mta.org/htmlman2/sched_setaffinity.2.html

Answer 2

Don't do this. Let the system schedule the threads. If you affinitise the threads to distinct cores you just handicap the scheduler. When your app is the only one consuming CPU, the scheduler will naturally schedule each thread on a separate core.