Date: Thu, 10 Aug 2006 08:52:27 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: "Tamouh H." <hakmi@rogers.com> Cc: questions@freebsd.org, 'Ian Smith' <smithi@nimnet.asn.au> Subject: Re: Top not showing cpu usage even remotely accurately Message-ID: <20060810055227.GA7051@gothmog.pc> In-Reply-To: <20060810044557.2E0E843D46@mx1.FreeBSD.org> References: <Pine.BSF.3.96.1060810135055.16843A-100000@gaia.nimnet.asn.au> <20060810044557.2E0E843D46@mx1.FreeBSD.org>
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On 2006-08-10 00:45, "Tamouh H." <hakmi@rogers.com> wrote: > > But since running 5.x (5.5-STABLE since 1st Aug) top can show > > 0.0% idle but the cpu usages shown don't add up to much of a > > fraction of 100%. In recent 6.X versions, you can use 'S' to show system threads too. For an even more fine-grained view, you can use 'H' to show each thread separately. Then there is also the 'CPU' mode (as opposed to the default 'WCPU' mode of top). > I've the same issue with FBSD 5.4 and TOP. In fact, the load > averages are so irrelevant now that I barely pay attention to > them. The server goes to 4 or 6 load averages without slowing down, > and other times the load average would be 0.8 and the server is > running slow. Probably because the work it does at the moment is not CPU-bounded? > An example of unmatching TOP: > > last pid: 17889; load averages: 0.60, 0.52, 0.50 up 3+17:22:33 00:41:45 > 186 processes: 2 running, 183 sleeping, 1 lock > CPU states: 30.0% user, 0.0% nice, 1.7% system, 0.1% interrupt, 68.3% idle > Mem: 1678M Active, 1110M Inact, 287M Wired, 87M Cache, 112M Buf, 103M Free > Swap: 8762M Total, 1584K Used, 8760M Free > > PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU COMMAND > 5071 nobody 101 0 43124K 35180K CPU2 2 0:07 14.89% 14.89% httpd > 14409 nobody 4 0 43940K 36076K sbwait 0 0:01 1.22% 1.22% httpd > 95515 nobody 4 0 39892K 32188K sbwait 1 0:08 0.29% 0.29% httpd Try hitting 'S'. Perhaps the system spends too much time in system threads (i.e. the "syncer") :)
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