Search found 8 matches

by nelsonag
Tue Nov 15, 2011 3:40 am
Forum: Parallelization
Topic: Threading with OpenMP
Replies: 24
Views: 11637

Re: Threading with OpenMP

Thats good news. Looking forward to working with it.
by nelsonag
Thu Nov 03, 2011 4:32 am
Forum: Parallelization
Topic: Threading with OpenMP
Replies: 24
Views: 11637

Re: Threading with OpenMP

Agreed on your first 2 points. As for the 2nd and 4th tips, the best I can come up with (and I am a nuclear engineer as well and not a computer scientist) is to waste memory and instead of storing variable a (from the example above) in a 1-D array, make it 2-D, and have 2nd dimension be garbage with...
by nelsonag
Wed Nov 02, 2011 4:00 pm
Forum: Parallelization
Topic: Threading with OpenMP
Replies: 24
Views: 11637

Re: Threading with OpenMP

I'm sure you are well past the stage where this post matters, but I just stumbled upon it now and thought I would throw my two cents in. It looks to me like what is happening is 'false sharing'. This is a common thing in shared memory problems and can happen in a parallelized loop as simple as this:...
by nelsonag
Wed Oct 26, 2011 12:12 am
Forum: Compiling and installing Serpent
Topic: Compiling LibGD
Replies: 6
Views: 11769

Re: Compiling LibGD

I just found the GD library in OpenSUSE: http://software.opensuse.org/search?q=gd&baseproject=openSUSE%3A11.4&lang=en&exclude_debug=true (If that whole link did not work, go to software.opensuse.org and search for GD). That site shows you the exact package name to look for in the Yast Software Manag...
by nelsonag
Fri Sep 23, 2011 8:07 pm
Forum: Users
Topic: pins and generating few-group x/s
Replies: 3
Views: 2019

Re: pins and generating few-group x/s

Ah, it looks like I can create another infinite universe for the water, and just do a 'fill water' with that inside the pin declaration. I haven't fully validated the cross-section results, but at least my Nu_SigmaF (NSF) results are 0.0 when I expect them to be!

Thanks,
Adam
by nelsonag
Fri Sep 23, 2011 4:38 pm
Forum: Users
Topic: pins and generating few-group x/s
Replies: 3
Views: 2019

Re: pins and generating few-group x/s

Thanks Jaako.

In that case what universe (to be referred to by gcu), would the water (and water alone) be in?

Thanks,
Adam
by nelsonag
Thu Sep 22, 2011 5:28 pm
Forum: Users
Topic: pins and generating few-group x/s
Replies: 3
Views: 2019

pins and generating few-group x/s

Hello, I am trying to pull out cross-sections from my model for a MoC code. This code does not homogenize over a pin cell (i.e., the fuel has its own cross-section, and the water has its own cross-section). It seems to me as if using the 'pin' macro in Serpent, and then using a lattice to set up a c...
by nelsonag
Mon Sep 19, 2011 7:36 pm
Forum: Methods
Topic: matching fidelity of x/s generated by Lattice Physics codes
Replies: 0
Views: 1994

matching fidelity of x/s generated by Lattice Physics codes

Hi all, Obviously a user would want to simulate as many neutrons as is economic to generate the multi-group cross-sections; however, is anyone aware of a study performed which examined how many neutrons (batches) are necessary to match the fidelity of cross-sections generated by the lower order phys...