On Tue, 8 Jul 2003, Doug White wrote: > On Tue, 8 Jul 2003, Andy Farkas wrote: > > > Any other ideas? Why would 3 (niced) cpu intensive processes suddenly get > > reduced cpu time (on a 4 cpu system) when a 4th non-resource intensive > > process gets started? > > Hm.. guess its time to explain how nice works again. > > Nice is a relative value. If you have 2 processes in a system, one with a > lower nice value (== higher "priority") than the other, the lower-niced > process will be scheduled in deference to the higher-niced process. The > scheduler attempts to ensure that niced processes are not starved. (In > practice, nice level 20 gets some special treatment.) That doesn't explain why the idle time goes up, in my case. If you have 4 processors in a box and start 3 cpu-intensive jobs, the system load will be 3.00 and idle time will be 25%. If you start another semi cpu-intensive process, one would expect the load to increase and the idle time to come down, regardless if the other 3 procs are niced or not. ps. setiathome procs run at idle level 15. -- :{ andyf_at_speednet.com.au Andy Farkas System Administrator Speednet Communications http://www.speednet.com.au/Received on Tue Jul 08 2003 - 13:40:44 UTC
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