Re: 16-way stacker performance

From: Valdis.Kletnieks@private
Date: Thu Jun 02 2005 - 12:07:37 PDT


On Thu, 02 Jun 2005 13:37:15 CDT, serue@private said:

> Num     Parent   Child   Child  Jobs per   Jobs/min/  Std_dev  Std_dev  JTI
> Forked  Time     SysTime UTime   Minute     Child      Time     Percent 
> 1       0.07     0.03    0.03    87428.57   87428.57   0.00     0.00     100 
> 3       0.12     0.17    0.18    153000.00  51000.00   0.00     0.00     100

OK.. Found it.  The granularity on the stime and utime is basically __hz - so
on a kernel that uses CONFIG_HZ=100, we only have 1 or 2 digits of precision here.
Even with CONFIG_HZ=1000, we barely get 3 digits.

Is there any way to get REAIM to loop around several hundred times, so the
times are into the 1-10 second range rather than hundredths of a second? If we
get the CPU time up to the 5-10 second range, we'll get 3 digits even at HZ=100....

(What does "zcat /proc/config.gz | grep -i hz" give on the test boxes, anyhow?)





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