Irshad,
You can get information on signals with
man 7 signal
which will tell you that signal 11 is a sementation fault, and signal 15
is a termination signal. Your program is probably having trouble due to
the segfault, which probably means you are going outside the bounds of
an array or dereferencing a null pointer. It is likely that this is a
general programming issue and not an MPI issue, but I can't say for
sure. The best way to find the problem is with a debugger. Try gdb, or
the graphical frontend for it, ddd. Don't forget to compile with -g.
http://www.gnu.org/software/ddd/
Scroll down to "How do I get started with DDD?". With some luck you'll
end up with a big red arrow pointing to the problem.
-Luke
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