Re: command piped into bzip not using all available CPU

From: Aaron Seelye (aseelye-lists_at_eltopia.com)
Date: 04/17/04

  • Next message: Jon Noack: "Re: command piped into bzip not using all available CPU" 
    To: "Jim C. Nasby" <jim@nasby.net>, <freebsd-performance@freebsd.org>
Date: Fri, 16 Apr 2004 15:48:19 -0700

    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
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  • Next message: Jon Noack: "Re: command piped into bzip not using all available CPU"

    Relevant Pages

    • Re: command piped into bzip not using all available CPU
      ... Why would I expect to see it only use one CPU? ... There were two CPU-intensive processes running, ... It's not disk bound, both systat and gstat report less ... >> To unsubscribe, send any mail to ...
      (freebsd-performance)
    • Re: command piped into bzip not using all available CPU
      ... that one cpu was 100% full, and the other was 3%, due to system usage, ... command piped into bzip not using all available CPU ... The 47% idle indicates to me that it's not. ... > To unsubscribe, send any mail to ...
      (freebsd-performance)