I come here because I have searched and tried different optimization without finding any answers.
We have a server with four websites hosted. The frequentation is not very high (we are sure that the problem is not the number of visitors).
We have a LAMP architecture (Centos 6.4, Apache, MySQL and PHP in the latest version). We also use eaccelerator. On a recent server 16GB DDR3, Intel Xeon E3 (4 cores @3.1 GHz).
Apache has a basic configuration with a few modules disabled and few to try to resolve our problem. MaxClients = 150 and MaxRequestsPerChild = 100.
Our problem is that some apache process inflates on weight up to several GB (I have seen one at 12GB !!! it was launched since15 minutes). At most processes live a long time more they grow with a large CPU usage... Then monitoring restart Apache...
I had no idea where the problem can come. The Apache log show nothing abnormal. This problem occurs both during the day than at night and it seems random.
thank you for your help.