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October 2015

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Subject:
Re: -parallel
From:
Joey Harrison <[log in to unmask]>
Reply To:
MASON Multiagent Simulation Toolkit <[log in to unmask]>
Date:
Wed, 28 Oct 2015 09:16:25 -0400
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I'm pretty sure that's not it. I'm seeing the same thing when I run it on one of the cluster machines. 



> On Oct 28, 2015, at 6:10 AM, Ernesto Carrella <[log in to unmask]> wrote:
> 
> Is your RAM being the bottleneck by any chance?
> 
>> On Wed, Oct 28, 2015 at 5:16 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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