Messages in this thread | | | Date | Tue, 22 Apr 1997 14:27:09 -0700 (PDT) | From | Dean Gaudet <> | Subject | way cool: linux fork speed |
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Just something I had to share... I just completely rewrote apache's restart signal handling, to finish the "graceful restart" option that doesn't toss connections in progress while restarting (they clean up after they finish and notice that the generation counter is different). One of my tests is a "while 1 kill -USR1" loop (USR1 is the graceful restart signal).
On a rather heavily loaded dual-p133 linux 2.0.30 system I was getting 10 to 15 restarts per second. Last night under less load I saw it do 25 restarts in a second.
On a completely unloaded Ultra 2 running solaris 2.5.1 I could only get 8 restarts per second.
That's an impressive statement on linux's fork() speed, which is the major cost in these restarts (along with killpg(), and cleaning up the children).
Dean
P.S. I think people will like this new restart code... even while restarting it 10 times per second I was able to surf the site in question without broken links, and a 40Mb .mov file kept on coming without interruption.
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