May 19, 2020
12:41 p.m.
On Tue, May 19, 2020 at 8:33 AM Barry Scott <barry.scott@forcepoint.com> wrote:
On Monday, 18 May 2020 22:21:16 BST Tom Most wrote:
If looking improve process management in Twisted, I think that the lowest-hanging fruit is to watch children with pidfd, rather than reaping all children on SIGCHLD. This O(n) reaping --- one waitpid() call per running process --- starts to consume substantial CPU. IIRC it pegged a core at 20,000 processes or so.
Why not waitpid for all children (pid=0 or pid=-1) in a single call?
Barry
Because then you might reap a child process someone launched with a different API - eg the Python subprocess module. Jean-Paul