Stresstest: mysql 15% cpu / apache 85% cpu

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Hello,

 

I ran a loadtestingtool on a server within our lan (windows xp sp2 + 4gb ram + mysql4.x + apache 2.x).

 

If I simulate about 30 users, the shop runs quite well, but if I simulate > 100 users, my apache is going to 85% of cpu-usage till it craches after some seconds.

 

someone knows how to make my apache running faster?

 

thank you.