https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254639
Mark Johnston <[email protected]> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |[email protected] --- Comment #1 from Mark Johnston <[email protected]> --- How much RAM do you have? Hopefully more than 100GB. I suspect that we're spending a lot of time in pmap_copy(), which copies page tables into the child process. It only copies referenced PTEs, but in this case we'll copy all of the page tables backing some_str. You can try something like this to confirm: # dtrace -q -n 'fbt::pmap_copy:entry /pid == $target/{self->ts = timestamp} fbt::pmap_copy:return /self->ts/{@ = sum(timestamp - self->ts); self->ts = 0;} tick-1s {printa("spent %@dns copying\n", @); clear(@);}' -c "python test.py" -- You are receiving this mail because: You are the assignee for the bug. _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "[email protected]"
