One part of doing Apache-Tuning is to play around with the MPM configuration:
<ifmodule prefork.c> StartServers 4 MinSpareServers 3 MaxSpareServers 10 ServerLimit 256 MaxClients 256 MaxRequestsPerChild 10000 </ifmodule>
The particular configuration setting for Apache can be found in the file /etc/apache/httpd.conf
I’m using Webmin->Sysstats to get some basic data where I can start from.
First I wanted to know the average and total memory usage of the apache worker process(es).
As you can see after a few days you get a clew about how our worker memory consumption behaves.
Especially the per worker chart is import which gives you a hint for the MaxClients and ServerLimit settings.
The used bash script :
-getApachePerWorkerMem)
ps -ylC apache2 | awk '{x += $8;y += 1} END {print x/((y-1)*1024)}';;
-getApacheTotalMemPercent)
sys_mem=`free -m | awk 'NR==2{print $2 }'`
apache_total_mem=`ps -ylC apache2 | awk '{x += $8;y += 1} END {print x/1024;}'`
echo "scale=2;$apache_total_mem/($sys_mem/100)" | bc;;
Another important part is the relation of idle and busy workers.
Here we see that in this particular case we have an average ratio 10/2 (idle/busy) and our max is about (11/7) which gives a balanced amount of idle and busy workers.
The used bash script :
-getApacheBusyWorker) echo `wget -q -O - "$URL" --user="$USER" --password=$PASS |grep BusyWorker |cut -d" " -f2`;; -getApacheIdleWorker) echo `wget -q -O - "$URL" --user="$USER" --password=$PASS |grep IdleWorker |cut -d" " -f2`;;
have fun
Mario