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

[image: image.png]

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
>