Re: 16-way stacker performance

From: Valdis.Kletnieks@private
Date: Wed Jun 01 2005 - 14:13:56 PDT


On Wed, 01 Jun 2005 15:39:01 CDT, serue@private said:
> REAIM Workload
> Times are in seconds - Child times from tms.cstime and tms.cutime
> 
> nostack
> 
> 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       0.17     0.27    0.23    108000.00  36000.00   0.00     0.00     99 
> 5       0.20     0.49    0.46    153000.00  30600.00   0.01     6.19     93 
> 7       0.29     0.92    0.97    147724.14  21103.45   0.01     4.04     95 
> 9       0.36     1.40    1.75    153000.00  17000.00   0.01     2.70     97 
> Max Jobs per Minute 153000.00
> 
> stack:
> 
> REAIM Workload
> Times are in seconds - Child times from tms.cstime and tms.cutime
> 
> Num     Parent   Child   Child  Jobs per   Jobs/min/  Std_dev  Std_dev  JTI
> Forked  Time     SysTime UTime   Minute     Child      Time     Percent 
> 1       0.07     0.04    0.03    87428.57   87428.57   0.00     0.00     100
> 3       0.18     0.30    0.22    102000.00  34000.00   nan      nan      -2147483648 
> 5       0.21     0.52    0.50    145714.29  29142.86   0.00     1.98     98 
> 7       0.30     1.06    0.99    142800.00  20400.00   0.01     3.01     96 
> 9       0.36     1.59    1.55    153000.00  17000.00   0.01     2.85     97 
> Max Jobs per Minute 153000.00

How many significant figures does this actually provide? I'm *very* leery of the
fact that for 1, 9, and max, jobs/minute was identical (additionally, the values
for 3 and 7 seem to point at only 2-3 significant digits).  It's *very* hard to
make any real conclusions about 2-3% performance hits (which is what the other
numbers hint at) when you don't have enough significant digits in the number to
accurately measure a 2% difference.....





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