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I am trying to run my program in more than one core. I have 12 cores in my desktop and want the computer to use 1,2,3,4,……,11,12 one by one and want to test how the program performs in different number of cores. I tried using -t4 or -t 4 after the executable like.
./a.out -t4
but I cannot make sure whether its using exactly 4 or not. Can anyone please help me out understand this or point me in right direction.
Your program has to be multi-threaded to use several cores of your machines.
This means that the actual code of the program has to be aware of threads and use them efficiently.
You cannot simply ask a program to run on a given number of threads.
You have to use a thread library such as pthread to spawn threads and distribute work over them.