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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]> 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