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