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Graham Dumpleton
graham.dumpleton at gmail.com
Tue Jan 22 00:22:00 EST 2008
What version of Apache are you using? What Python web application are you running on top of mod_python, a self built one or one that uses one of the larger web frameworks? Does your application create sub processes in any way to perform additional work? Graham On 22/01/2008, Alec Matusis <matusis at yahoo.com> wrote: > I have been investigating a memory leak that occurs on an apache server > since we switched to worker MPM. > I found that the source of it are apache subprocesses that lose track of > their parent and never exit: > > root at web10 ~> ps -ef | grep httpd > root 16197 1 0 02:00 ? 00:00:09 > /usr/local/encap/httpd/bin/httpd -f /p2/web/conf/web10.conf -k start > nobody 17750 1 0 17:53 ? 00:00:00 > /usr/local/encap/httpd/bin/httpd -f /p2/web/conf/web10.conf -k start > nobody 5112 16197 4 20:02 ? 00:00:16 > /usr/local/encap/httpd/bin/httpd -f /p2/web/conf/web10.conf -k start > nobody 5159 16197 4 20:02 ? 00:00:15 > /usr/local/encap/httpd/bin/httpd -f /p2/web/conf/web10.conf -k start > nobody 5300 16197 4 20:03 ? 00:00:14 > /usr/local/encap/httpd/bin/httpd -f /p2/web/conf/web10.conf -k start > > > in this output, apache child pid 17750 has pid 1 as a parent, and it is one > of those 'zombie children'. > Pids 5112, 5159, 5300 were normal (parent is pid 16197), and they exited > after MaxRequestsPerChild was reached. > > Does anybody have any advice on this? I cannot correlate this to anything, > there's nothing interesting in the server error log. > These 'zombies' appear at a rate of 2-3 per day; this apache serves about > 350 requests per second. > > This Apache configuration is > > ServerLimit 40 > ThreadLimit 70 > > StartServers 10 > MaxClients 1600 > MinSpareThreads 75 > MaxSpareThreads 200 > ThreadsPerChild 40 > MaxRequestsPerChild 10000 > > > > > > _______________________________________________ > Mod_python mailing list > Mod_python at modpython.org > http://mailman.modpython.org/mailman/listinfo/mod_python >
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