100% CPU : hit a limit ?

Hi,

My HAproxy has just reached 100% CPU :

Cpu0 : 0.7%us, 0.7%sy, 0.0%ni, 74.8%id, 0.0%wa, 4.3%hi, 19.5%si, 0.0%st Cpu1 : 6.3%us, 90.4%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 3.3%si, 0.0%st Mem: 1023848k total, 857328k used, 166520k free, 280708k buffers Swap: 1228792k total, 40k used, 1228752k free, 121624k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
15019 root      25   0  108m 107m  408 R  100 10.7  46:50.52 haproxy

And by the way, this is not shared between the CPUs as you can see. ( Linux version is 2.6.20.7 )

Is that the normal behaviour when I hit a performance / capacity limit ? It's using up 40mbit/s on a Pentium 4, with many hits, and currently 2500 simultaneous sessions.

The sites are still running kind of OK even if they are slighly slow...

Regards,

Patrick Received on 2008/03/10 11:03