Load spikes

For example;

http://www.downloads.net.nz/stats/system/load-day.gif

Normally, load would slowly rise ( increased web requests etc ) Howver, this load is spiking like ching chong.

Any ideas why?

Apache is fairly busy, but not chronically causing any problems ( I think ).

mysql is hardly busy, and everything else ( apps ) don't seem to be causing any problems ( as far as i know ).

Any ideas why load would be spiking like this?

 

 

 

 

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