[users@httpd] Memory of childprocess

[Peter Huesser <pe...@psi.ch>]

Hello

Our webserver (on linux) freezes from time to time. I checked the 
/var/log/messages file and found very often (but not allways in 
connection with the freezing time) an entry like:

  ... kernel: Out of Memory: Killed process ... (httpd)

In the meantime I set the MaxMemFree too 900MB (the server has 924MB 
real memory and 1GB of swap). Freezing still occurs and I also see the 
same error message (more often, as I expected). In connection to this 
problem I had a look at the memory consumption of the 
httpd-childprocesses. I am wondering how it is possible that one (or 
most of the time two) of them consumes about 1/3th of memory each while 
all the others use only about 1% or less. I had a look at the activity 
of a large-memory-consumption process and a small-memory-consumption one 
(using "strace -f -p ...") but do not see any significant difference ? 
How is this possible ? If a childprocess once allocated memory, doesn't 
it frees it again ? If this is the case one allways has to use 
"MaxRequestPerChild". I am using apache 2.0.46.

Thank's for any help

    Pedro


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