Date: Thu, 03 Jul 2008 08:54:12 -0700 From: Peter Giessel <pgiessel@mac.com> To: John Almberg <jalmberg@identry.com> Cc: freebsd-questions@freebsd.org Subject: Re: Does 'top' work on multi-processor systems? Message-ID: <3F8B80E5-011A-1000-94A3-A1AA554CE4A1-Webmail-10016@mac.com> In-Reply-To: <46194DB4-E56D-4F9B-ABDF-2D76CBBF6C41@identry.com> References: <46194DB4-E56D-4F9B-ABDF-2D76CBBF6C41@identry.com>
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If I recall correctly, on dual processor systems, 200% is full processor utilization, so on an essentially 8 processor system, 800% would be full processor utilization. 157% in top would actually amount to about 20% of your full processor power. On Thursday, July 03, 2008, at 05:41AM, "John Almberg" <jalmberg@identry.com> wrote: >I have a 3 month old server with two quad-core processors, 8G of RAM, >and an array of fast hard drives. The two main applications are web >server and mail server. There are only about 20 small-business >websites and approx. 40 email accounts on the server. i.e., not much. > >In terms of actual usage, performance is great. Web pages load fast, >and email is processed quickly. And the 92 days of up time says that >this server has been up 100% since it's been installed in colo. > >However, 'top' shows a fairly high load (see below). If when I leave >top running for a while, I see the load average spike up to 7 or 8 >occasionally. However, this doesn't translate into slow >performance... pages still load quickly. > >Also, what's up with that 157% WCPU for the mysql process? That just >seems wrong. The WCPU number for mysql has been stuck up above 100% >for a few weeks... it seems like something is broken there. > >On my previous single processor system, top was a good rough >indicator of how the system was doing. But it doesn't seem to work >very well on this 8 core system. > >My best guess is that the bogus mysql number is also throwing off the >load averages, making them higher than they really are, but that's >just a guess. > >Any thoughts? Is there a better tool for measuring load? > >-- John > > >last pid: 43730; load averages: 1.93, 2.64, >2.22 up 92+19:45:54 09:26:27 >238 processes: 3 running, 235 sleeping >CPU states: 8.1% user, 0.0% nice, 17.3% system, 0.2% interrupt, >74.4% idle >Mem: 1384M Active, 3753M Inact, 373M Wired, 884K Cache, 214M Buf, >2150M Free >Swap: 16G Total, 88K Used, 16G Free > > PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU >COMMAND > 1393 mysql 63 20 0 400M 221M kserel 0 191.5H 157.13% >mysqld >43698 www 1 4 0 169M 29888K sbwait 5 0:00 2.63% httpd >43697 www 1 20 0 169M 29804K lockf 1 0:00 1.18% httpd >23376 vpopmail 1 4 0 81468K 55772K select 7 0:28 1.17% >perl5.8.8 >43729 root 1 96 0 7228K 2676K select 5 0:00 1.00% >couriertls >43695 www 1 4 0 169M 29768K sbwait 5 0:00 0.67% httpd >43417 www 1 4 0 170M 31340K sbwait 7 0:00 0.20% httpd >85622 root 1 4 0 98588K 68764K select 5 7:54 0.20% ruby >43325 www 1 20 0 170M 30412K lockf 7 0:00 0.15% httpd > 6352 root 1 4 0 97660K 67784K select 3 1:04 0.10% ruby >42848 www 1 4 0 169M 30004K sbwait 4 0:00 0.10% httpd >43111 www 1 20 0 170M 30336K lockf 2 0:00 0.05% httpd > >_______________________________________________ >freebsd-questions@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-questions >To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > >
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