command piped into bzip not using all available CPU
Jim C. Nasby
jim at nasby.net
Sun Apr 18 19:22:40 PDT 2004
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 at nasby.net>
> To: <freebsd-performance at 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 at nasby.net
> Member: Triangle Fraternity, Sports Car Club of America
> Give your computer some brain candy! www.distributed.net Team #1828
>
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--
Jim C. Nasby, Database Consultant jim at 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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