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October 2015

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Subject:
Re: -parallel
From:
Sean Luke <[log in to unmask]>
Reply To:
MASON Multiagent Simulation Toolkit <[log in to unmask]>
Date:
Wed, 28 Oct 2015 08:53:28 -0400
Content-Type:
text/plain
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text/plain (28 lines) 
The total number of jobs is repeat x parallel.



On Oct 28, 2015, at 1:16 AM, Joey Harrison <[log in to unmask]> wrote:



> I'm experimenting with the -parallel flag and finding that using 2 parallel threads is slower than a single thread, and using 3 is slower still. I have 4 cores on my machine, FYI.

> 

> $ time java -jar HeatBugs.jar -for 10000 -repeat 4 -parallel 1 -quiet

> 

> real	0m4.514s

> user	0m6.098s

> sys	0m0.749s

> 

> $ time java -jar HeatBugs.jar -for 10000 -repeat 4 -parallel 2 -quiet

> 

> real	0m4.799s

> user	0m12.019s

> sys	0m1.437s

> 

> $ time java -jar HeatBugs.jar -for 10000 -repeat 4 -parallel 3 -quiet

> 

> real	0m5.972s

> user	0m21.190s

> sys	0m2.933s

> 

> What's the deal here?

> 

> Joey

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