Charm++ parallel programming system

[Shad Kirmani <sxk5292 AT cse.psu.edu>]

I generate 8-10 particles distributed uniformally(using rand) in space from (-5,-5) to (5,5). 

I print out the forces calculated by ChaNGa and the order in which they are calculated. 

I verify the force calculations by doing them manually(since the number of particle is small) and in the same order as ChaNGa. 

I used the default parameters. I ran on a single treepiece. 

Thanks for looking in to this.

Shad Kirmani

Graduate Student

CSE PSU

On Tue, May 10, 2011 at 12:27 PM, Pritish Jetley <pjetley2 AT uiuc.edu> wrote:

Could you give us a few more details? In particular, it would be
helpful to have the data set you are using, as well as the parameters
passed to the code. Also, I'd like to know how you made the comparison
of forces. Did you use the output of an N^2 computation as a
yardstick?

Thanks,
Pritish

P.S.: I have included cosmology-ppl in the list of recipients. This is
the ChaNGa mailing list.

On Tue, May 10, 2011 at 9:42 AM, Shad Kirmani <sxk5292 AT cse.psu.edu> wrote:
> Hello,
> I have been using your ChaNGa code to calculate forces between the
> particles.
> When it comes to calculating forces there seems to be an issue. Particle to
> node (using nodeBucketForce in gravity.h) is not being calculated to the
> correct value. I am not being able to figure out why this is so.
> We printed out the tree and verified that it is correct. We also verified
> the Centre of Mass for each of the node to be correct.
> Can anyone give me helpful pointers where I might be going wrong?
> Thanks,
> Shad Kirmani
> Graduate Student,
> CSE, Penn State

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--
Pritish Jetley
Doctoral Candidate, Computer Science
University of Illinois at Urbana-Champaign