Hello Jeff, Sunday, February 24, 2008, 11:47:39 PM, you wrote: >> So how does a multithreaded process get 458% CPU on a quad-core machine? :) >> (Really, I want to know; I thought thread CPU accounting was fixed in 7.x. >> Unless I'm mistaken, 4 CPU-intensive threads in a single process should >> account as 4 CPU-intensive single-thread processes; i.e. each could only take >> up to 100% of a core/CPU, accounting for NCPU*100% total). >> >> > It is possible for the sum of all threads in the system to exceed 100% > cpu. This is because the decay function is not precise. 15% over is a > bit more than I would expect but I suppose it's possible. We also inhert > pcpu information from the parent on fork/thread creation so the child > isn't created with a priority as if it had been idle. So for a moment the > utilization is duplicated. I have a box running mysqld, which sometimes exeeds 130%, what about this? ;) Also the mysqld is alsmost all the time in the "ucond" state, what does it mean? I've been told that it is probably waiting for I/O, but then, I have another box which is currently completely idle, but running mysql shows that it is "ucond" as well. -- Best regards, Daniel mailto:danger_at_FreeBSD.orgReceived on Mon Feb 25 2008 - 07:45:33 UTC
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