Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I have an OpenMP program running with say 6 threads on a 8-core machine. How can I extract this information (num_threads = 6) from another program (non-openmp, plain C program). Can I get this info from underlying kernel.
I was using run_queue lengths using “sar -q 1 0” but this doesn’t yield consistent results. sometimes it gives 8, few times more or less.
In Linux, threads are processes (see first post here), so you can ask for a list of running processes with
ps -eLf. However, if the machine has 8 cores, it is possible that OpenMP created 8 threads (even though it currently uses 6 of them for your computation); in this case, it is your code that must store somewhere (e.g. a file, or a FIFO) information about the threads that it is using.