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From Peter Folk <>
Subject [users@httpd] really slow response time even with standard html file
Date Wed, 02 Sep 2009 19:19:43 GMT
Hi All,

I am running a two machine system with load balance on debian 4.0 and apache
2.0 .

I guess I am not a real expert in apache so , my ideas are limited .

both machines have 4 cores and 4 GB ram  (php apps) .

What makes it more complex that we have many virtual hosts the apache config
file is about 80 KB (almost one single file with all hosts and aliases) .

What I see that when apache starts the memory starts to load up to 2,8 G see
config below . and then processor goes back and forth .

But even a single html file of 2Kb takes up to *5 seconds ! !* Firebug shows
that connection time is about 4 sec (this is when its waiting for a slot  ?
) .

I keep seeing in the log that I need to increase maxclients but if I do so
the memory consumption goes over the limit and we start to swap .

What tools should I use to better understand the problem and trace down this

Any ideas are welcome !


# prefork MPM
# StartServers: number of server processes to start
# MinSpareServers: minimum number of server processes which are kept spare
# MaxSpareServers: maximum number of server processes which are kept spare
# MaxClients: maximum number of server processes allowed to start
# MaxRequestsPerChild: maximum number of requests a server process serves
<IfModule mpm_prefork_module>
#    StartServers          5
StartServers          50
#StartServers   100
#    MinSpareServers       5
     MinSpareServers       10
#     MinSpareServers       30
#    MaxSpareServers      10
    MaxSpareServers      90
#    MaxSpareServers      30
#    MaxSpareServers      100
#    MaxClients          150
    MaxClients          436
    ServerLimit         436
#old    MaxRequestsPerChild   0
    MaxRequestsPerChild   0

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