Date: Mon, 2 Nov 2009 15:34:33 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Chris Stankevitz <chrisstankevitz@yahoo.com> Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Re: please help me make sense of top's CPU output Message-ID: <20091102213432.GY29215@dan.emsphone.com> In-Reply-To: <330157.31913.qm@web52911.mail.re2.yahoo.com> References: <330157.31913.qm@web52911.mail.re2.yahoo.com>
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In the last episode (Nov 02), Chris Stankevitz said: > I recently performed a CPU intensive task with Xorg. When I completed the > task and Xorg no longer was using the CPU, I got this result from top: > > === > > last pid: 1201; load averages: 0.24, 0.10, 0.09 up 0+00:29:42 > 63 processes: 1 running, 62 sleeping > CPU: 1.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 99.0% idle > Mem: 161M Active, 67M Inact, 68M Wired, 1240K Cache, 41M Buf, 1676M Free > Swap: 4060M Total, 4060M Free > > PID USERNAME THR PRI NICE SIZE RES STATE C TIME CPU > 1017 cstankevitz 1 104 0 366M 331M select 0 3:25 35.89% Xorg The CPU column in the process list is a decaying average (more useful to the kernel scheduler than an instantaneous value). You'll see it slowly drop to 0 over 10-15 seconds. Junior Hacker Project: add an instantaneous-CPU value (calculated by subtracting successive ki_runtime values) to the list of things top calculates and toggle it and weighted-CPU when pressing C. The toggling code is already there; it just toggles between two different weighted-cpu values at the moment. -- Dan Nelson dnelson@allantgroup.com
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