Date: Thu, 14 Sep 2006 00:42:04 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: "Tamouh H." <hakmi@rogers.com> Cc: 'Giorgos Keramidas' <keramida@ceid.upatras.gr>, questions@freebsd.org, 'Ian Smith' <smithi@nimnet.asn.au> Subject: Re: Top not showing cpu usage even remotely accurately Message-ID: <20060914054204.GA91336@dan.emsphone.com> In-Reply-To: <20060914044821.1039743D45@mx1.FreeBSD.org> References: <20060810055227.GA7051@gothmog.pc> <20060914044821.1039743D45@mx1.FreeBSD.org>
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In the last episode (Sep 14), Tamouh H. said: > This is one TOP that freaked me out, notice Idle CPU is 70% while the > process is showing it is using 99% of CPU. systat draws more accurate > picture, however, load average is still useless as far as performance > monitoring : > > last pid: 10174; load averages: 1.63, 1.44, 1.20 up 4+00:25:19 00:39:20 > 169 processes: 2 running, 166 sleeping, 1 zombie > CPU states: 25.8% user, 0.0% nice, 0.7% system, 0.1% interrupt, 73.4% idle > Mem: 1316M Active, 1445M Inact, 297M Wired, 127M Cache, 112M Buf, 79M Free > Swap: 8762M Total, 2096K Used, 8760M Free > > PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU COMMAND > 13362 root 111 0 36444K 34196K CPU3 3 50:06 98.88% 98.88% perl5.8.7 > 90391 root 96 0 27356K 26236K select 2 0:06 0.54% 0.54% perl5.8.7 > 79619 nobody 4 0 209M 84640K sbwait 1 0:09 0.39% 0.39% httpd > 10161 root 97 0 6712K 4752K select 2 0:00 1.40% 0.20% exim-4.62-0 > 79649 nobody 20 0 210M 84464K lockf 0 0:06 0.15% 0.15% httpd You have a 4-cpu box and pid 13362 is using 99% of one CPU. The other 3 are idle, so your %idle is going to be around 75%. Looks pretty accurate to me :) -- Dan Nelson dnelson@allantgroup.com
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