Hello again,

I was forced to use a profiler to see what's wrong and it appears that a method in an external random number generator library (CERN Mersenne Twister library) was the culprit.

The Poisson random number function would fall into a long loop for small Lambda parameters. I had modified the lambda to a small number in my simulation data files (not in the code).

Removed the function and used my own simple code and I now got a wooping 100x simulation speed....

Sorry for taking your time guys

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On Fri, 5 Mar 2021 at 15:18, Robert Zupko <[log in to unmask]> wrote:
Mac:

I’ve seen that before when a new Java patch has been installed. We’re there any updates to the system?

Regards,
Robert Zupko

> On Mar 5, 2021, at 09:46, Mac Sarmady <[log in to unmask]> wrote:
>
> Hello
>
> I am using Java 11 to run mason simulations. A few weeks ago my simulations were reasonably fast (crowd simulation with a few hundreds agents).
>
> Then I had a pause and when I ran the simulations a few weeks later they are extremely slow (perhaps between 4 to 10 times?)
>
> - Has anyone encountered such a thing on his/her JVM and simulations?
>
> - Is there a benchmark on any of the mason examples that I can test and see whether the problem is from the installation or something inside my own code (I don't remember changing it in the period)?
>
> Regards,
> Mac