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.
we bought Allinea DDT, which is pretty good. I think it's a good
illustration that the parallel part of debugging doesn't have to be
hard. getting parallel logic is still nontrivial, as often serial is.
Core dumps are your friends (though most linux distros turn them off by
while post-mortem approaches are quite valuable (though I probably use
strace/ltrace more frequently), they do not compare to being able to
walk your program through its paces, monitoring variables along the way,
even messing with the parallelism.
default now). That and compiling your code with symbols, and debugging
it is unfortunate that compiling with debugging will normally disable
a good number of valuable optimizations. I emphasize to users that
production code (ie, which consumes, say >1k cpu hours) needs to be
maximally tweaked. anything else is stealing from other users.
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