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Sean,

That certainly changes the situation. Amdahl, here I come!

Joey

On Wed, Oct 28, 2015 at 9:16 AM, <[log in to unmask]> wrote:

> 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]
> <[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
>>
>