This is a sequel to my previous question. I am using fork to create child process. Inside child, I am giving command to run a process as follows:
if((childpid=fork())==0)
{
system("./runBinary ");
exit(1)
}
My runBinary has the functionality of measuring how much time it takes from start to finish.
What amazes me is that when I run runBinary directly on command-line, it takes ~60 seconds. However, when I run it as a child process, it takes more, like ~75 or more. Is there something which I can do or am currently doing wrong, which is leading to this?
Thanks for the help in advance. MORE DETAILS: I am running on linux RHEL server, with 24 cores. I am measuring CPU time. At a time, I only fork 8 child (sequentially), each of which is bound to different core, using taskset (not shown in code). The system is not loaded except for my own program.