[mpich-discuss] MPE animation crash

[Schilling, Herbert W. (GRC-VE00)]

Hi Rob,

 Thanks for the response! It's amazing to get responses from people I see in videos that I watch about MPI.

 I will try to find some time to see if I can fix the animation crash. I hope I can find a much smaller sample code with the same problem. It would be a pain to debug this with the huge code that I am running now.

 Yes, definitely will use valgrind. Have used it before.

 About the question the actual animations, I may not have asked the question correctly or I am not reading your response correctly. I wanted to know what the arrows are trying to show in the sense of which 'mode' of sends are these? Or are all the sends shown the same way? Are bcasts, scatters, gathers shown differently ? Are they shown at all? I guess I can just try some sample codes to figure that out or look through the code. Just hoped it was written down somewhere.

 Thanks!


On Dec 14, 2015, at 12:22 PM, Rob Latham <robl at mcs.anl.gov<mailto:robl at mcs.anl.gov>>
 wrote:



On 12/09/2015 09:18 AM, Schilling, Herbert W. (GRC-VE00) wrote:
Hi,

 First of all, thanks again to everyone, especially Bill Gropp, for
modifying MPE so it works with OpenMPI.

 I did see a post somewhere about how the MPE animation code hasn't
been updated in a while. Is it still something that should be good to
use? It's a nice feature!

 In our code, it works for a while and then crashes with this

sorry you're running into problems with the MPE animation code. As you've seen, every once in a while one of us (probably Bill) will go in and clean up MPE, but for the most part it's community supported.

If you code up a fix, we'll gladly add it to MPE.

[ snip error]

What is really odd is that one I ran the exact same code with the exact
same command and it died much earlier while doing some kind of memory
allocation. Unfortunately, I didn't capture that error and I can't make
it happen again now.

such is the case with memory errors.  A tool like valgrind can tell you what's going on.

Also, without digging through the code to figure out how the animations
are being displayed, is there any documentation on that?

Appendix C of "Using MPI" might be the best overview.  The book also walks through a simnple monte carlo example in section 3.10 on page 65.

==rob

--
Rob Latham
Mathematics and Computer Science Division
Argonne National Lab, IL USA
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---------
Herb Schilling
Scientific Applications and Visualization Team
http://ocio.grc.nasa.gov/gvis
Office of the Chief Information Officer
NASA Glenn Research Center
hschilling at nasa.gov<mailto:hschilling at nasa.gov>




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