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I have a server process that forks many child processes. The server process has affinity to a CPU core, but I don't want that affinity to be inherited by child process (rather OS should handle where to run these processes). Is there a way to delink parent child processes with respect to cpu affinity?
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* The child inherits copies of the parent's set of open file descriptors. Each file descriptor in the child refers to the same open file description (see open(2)) as the corresponding file descriptor in the parent.
That's why the processor affinity mask is inherited: If you set it on the parent process, this covers all the child helper processes that process may launch as part of its execution. Another reason why you might want to set a process's affinity mask is to restrict its CPU usage.
The child's parent process ID is the same as the parent's process ID. The child does not inherit its parent's memory locks and semaphore adjustments.
fork() creates a new process by duplicating the calling process. The new process is referred to as the child process. The calling process is referred to as the parent process. The child process and the parent process run in separate memory spaces.
You can call sched_setaffinity(2) with all bits set in CPU mask after the fork(2) and before the execve(2).
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