Charm++ parallel programming system

[Eric Bohm <ebohm AT illinois.edu>]

Performance study of an incorrect code is putting the cart before the horse.  As a trace based performance analysis tool, Projections is suitable for debugging performance problems.  Due to its dependence on traces, it is inappropriate for the analysis of execution correctness problems. 

You can attach a debugger to your program on most charm platforms. 

For example: charmrun +p2 ./myprogram myargument ++debug-no-pause

On properly configured systems, that will run your program to the point at which it faults and provide you with a debugging session for each of the 2 processes.

Naturally, the debugger will be able to provide more state information if your code is compiled with -g.

On 11/04/2014 11:36 AM, Kale, Laxmikant V wrote:

I don’t think you could expect to get usable traces from a program that abnormally terminated. You may get lucky and get them, but there is no guarantee. 

— sanjay

On Nov 4, 2014, at 11:14 AM, Michael Robson <mprobson AT illinois.edu> wrote:

Hello,

Do you see any *.log files generated in addition to the .sts file? Usually these are written when the application completes whereas the .sts file is created much earlier in the application lifetime. In general you'll need the application to terminate correctly in order to collect logs. The projections manual mentions Online Live Analysis in Section 2.3.13 (see here: http://charm.cs.illinois.edu/manuals/html/projections/manual-1p.html#SECTION002313000000000000000) but I have not used it. I'd suggest looking at the sections on selective tracing and +logsize for controlling when logs are generated and how large they are.

Sincerely,

Michael

On Tue, Nov 4, 2014 at 10:52 AM, Vijayasarathy Kannan <kvijay AT vt.edu> wrote:

Hi,

I am trying to do some analysis and debugging on my application. It seemed that the projections tool can be used even when the application terminates abruptly but did not work for me. For example, I compiled my application with "-tracemode projections" on and ran it. The app terminated due to some issues and when I opened the projections tool using the ".sts" file generated, there were no options available on the tool.

Does the application need to have completed successfully for the projections tool to be used? Also, is it possible to run the tool during the execution of the application?

Thanks.

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Laxmikant (Sanjay) Kale         http://charm.cs.uiuc.edu

Professor, Computer Science     kale AT illinois.edu

201 N. Goodwin Avenue           Ph:  (217) 244-0094

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