Date: Sun, 18 Apr 2004 21:22:39 -0500 From: "Jim C. Nasby" <jim@nasby.net> To: Aaron Seelye <aseelye-lists@eltopia.com> Cc: freebsd-performance@freebsd.org Subject: Re: command piped into bzip not using all available CPU Message-ID: <20040419022239.GP87362@nasby.net> In-Reply-To: <002701c42404$e9dbecf0$3102a8c0@metallus> References: <20040416220556.GL87362@nasby.net> <002701c42404$e9dbecf0$3102a8c0@metallus>
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Perhapse I didn't make it clear, but this is on a dual CPU machine. I would expect that either bzip2 or pgsql would hit 100% CPU, using one entire CPU. The 47% idle indicates to me that it's not. On Fri, Apr 16, 2004 at 03:48:19PM -0700, Aaron Seelye wrote: > I would venture a guess that bzip is not multi threaded and therefore > isn't spreading the load around. > > -Aaron Seelye > ----- Original Message ----- > From: "Jim C. Nasby" <jim@nasby.net> > To: <freebsd-performance@freebsd.org> > Sent: Friday, April 16, 2004 3:05 PM > Subject: command piped into bzip not using all available CPU > > > As you can see below, a command piped into bzip2 is only effectively > using one CPU. It's not disk bound, both systat and gstat report less > than 10% disk utilization. Why is this? > > The command I'm running is: > pg_dump -vZ0 ogr | bzip2 > ogr-20040416.sql.bz2 > > last pid: 18345; load averages: 1.17, 1.09, 0.81 up 8+22:12:27 > 17:00:56 > 66 processes: 2 running, 64 sleeping > CPU states: 49.4% user, 0.0% nice, 3.7% system, 0.2% interrupt, 46.7% > idle > Mem: 67M Active, 2935M Inact, 359M Wired, 331M Cache, 255M Buf, 5576K > Free > Swap: 8192M Total, 64M Used, 8127M Free, 48K Out > > PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU > COMMAND > 17334 decibel 109 0 10856K 7164K CPU0 0 11:05 65.77% 65.77% > bzip2 > 17335 pgsql 4 0 154M 124M sbwait 0 5:54 34.03% 34.03% > postgres > 17333 decibel -8 0 20128K 3236K pipdwt 0 0:46 2.88% 2.88% > pg_dump > -- > Jim C. Nasby, Database Consultant jim@nasby.net > Member: Triangle Fraternity, Sports Car Club of America > Give your computer some brain candy! www.distributed.net Team #1828 > > Windows: "Where do you want to go today?" > Linux: "Where do you want to go tomorrow?" > FreeBSD: "Are you guys coming, or what?" > _______________________________________________ > freebsd-performance@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-performance > To unsubscribe, send any mail to > "freebsd-performance-unsubscribe@freebsd.org" > > > > _______________________________________________ > freebsd-performance@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-performance > To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org" > -- Jim C. Nasby, Database Consultant jim@nasby.net Member: Triangle Fraternity, Sports Car Club of America Give your computer some brain candy! www.distributed.net Team #1828 Windows: "Where do you want to go today?" Linux: "Where do you want to go tomorrow?" FreeBSD: "Are you guys coming, or what?"
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