Mailinglist Archive: opensuse-factory (808 mails)

[Ruediger Meier <sweet_f_a@xxxxxx>]

On Tuesday 30 August 2011, Claudio Freire wrote:
> > BTW you can see that user time is 15% higher with pigz so
> > compression per core cycle is worse.
>
> That's called cache pressure. It happens when more than one process
> is running. Run four gzips concurrently, you'll probably experience
> the same increase.

Yes, ...
... and ouf course you will see that gzip has more throughput in any 
case while the system is less on load:

# 4 x gzip in parallel
rudi@quant:/tmp> time  ( for i in `seq 1 4` ; do  gzip  -c hist.csv & 
done ;wait )   > /dev/null

real   0m30.500s
user   1m59.311s
sys    0m0.978s

# 4 x pigz in parallel in parallel
rudi@quant:/tmp> time  ( for i in `seq 1 4` ; do  
~rudi/tmp/pigz-2.1.6/pigz -c hist.csv & done ;wait )   > /dev/null

real   0m35.164s
user   2m18.944s
sys    0m1.236s

# 4 x pigz sequential
-bash: syntax error near unexpected token `)'
rudi@quant:/tmp> time  ( for i in `seq 1 4` ; do  
~rudi/tmp/pigz-2.1.6/pigz -c hist.csv ;done ;wait )   > /dev/null

real   0m35.147s
user   2m16.647s
sys    0m3.398s


cu,
Rudi


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