command piped into bzip not using all available CPU

[Aaron Seelye]

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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