apache uses impassioned cpu


we run medium-size site gets few hundred thousand pageviews day. adult until final weekend ran bucket wholly next 0.2 practical machine. os ubuntu.



when deploying latest chronicle the application, also an apt-get dist-upgrade before deploying. after deployed beheld bucket cpu peaked dramatically (sometimes reaching 10 pause respond page requests).



we attempted transfer full footnote xdebug profiling information php, nonetheless looking by suggested wholly few rather delayed parts, nonetheless zero explain vast jump.



we graceful certain zero new chronicle the website triggering problem, nonetheless have proceed sure. have rolled behind lot changes, nonetheless problem still persists.



when feeling during processes, unparalleled apache processes definitely bit cpu over longer generation quite necessary. however, controlling strace influenced process, never anything but



accept(3,


and hangs while before receiving new connection, can't indeed causing problem.



the smoke-stack php 5, apache 2 (prefork), mysql 5.1. many things run by memcached. we've attempted apc eaccelerator.



so, should the unbroken step? there any profiling methods overlooked/don't know about?



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