out of memory httpd

i got this line in my messages log



Feb 18 11:32:16 server1 kernel: Out of Memory: Killed process 29184 (httpd).



my load reaches 200 ... i do a restart and every thing come to normal



my current top


7:12am up 59 min, 1 user, load average: 0.64, 0.79, 0.77
210 processes: 206 sleeping, 4 running, 0 zombie, 0 stopped
CPU states: 22.3% user, 5.3% system, 0.4% nice, 71.8% idle
Mem: 1031032K av, 986712K used, 44320K free, 0K shrd, 71016K buff
Swap: 1044216K av, 5936K used, 1038280K free 587728K cached



what is the reason of this message

 

 

 

 

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