[Beowulf] debugging

Michael Will mwill at penguincomputing.com
Thu Apr 12 14:12:52 PDT 2007


Which version of Scyld is that? I just tried it out on 30cz1 and CW4 and 
neither had an issue, however
that little mpihello.c might not have been representative of what your 
application does... Did you engage


Matt Funk wrote:
> Hi,
> i hope this is the right mailing list to post to...
> Anyway, i was wondering if i could get some advice/direction on how to debug 
> my mpich program. I am running on a scyld configuration. What i am trying 
> right now is the following:
> mpirun -dbg=gdb -nolocal -np 32 exec
> which starts the debugger in which i go
> run args
> which then start the program. However, it doesn't get very far until it just 
> sits there. When i ps all the processes are defunced.
> When i do the same thing except mpirun -dbg=gdb -nolocal -np 1 exec
> and run it in the debugger, the program starts running well.
> The reason i want to run on 32 processor though, is that it takes (on 32 
> procs) several hours till my program crashes. Also, i would like to be able 
> to keep the conditions under which it crashes intact as much as possible 
> (i.e. run on 32 procs rather than 1).
> Does anyone have any advice? I am open to try out other things as well if 
> possible. I am just starting to learn debugger techniques for a parallel 
> program.
> thanks
> mat
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Michael Will
Penguin Computing Corp.
Sales Engineer
415-954-2899 fx
mwill at penguincomputing.com 

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