[Beowulf] backtraces

Ashley Pittman apittman at concurrent-thinking.com
Mon Jun 11 11:36:45 EDT 2007


On Mon, 2007-06-11 at 07:32 +0200, Toon Knapen wrote:
> Interesting indeed. On which platform is this backtrace.so available 
> (obtaining backtraces is higly platform dependent AFAIK) ?

It's highly dependant to implement but I should imagine most people who
need backtraces use a debugger, the libc backtrace() function or
libbacktrace which can be use from either inside or outside the target
process, these tend to be platform independent.

> Mark Hahn wrote:
> > I had a user grumble about how it was not trivial to get a basic 
> > backtrace on our clusters.  his jobs tend to be 32-128p,
> > and run for a week, so it's not ideal to run them under the debugger.

It really shouldn't be that difficult, on a Quadrics cluster at least
you can use the command "padb -x -r <rank> <jobid>" from anywhere in the
cluster to see a backtrace from any given rank.

Ashley,

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