Performance And Debugging Tools: GPC

Memory Profiling & Debugging

Valgrind http://valgrind.org/ is a suite of tools for debugging and profiling programs especially useful for finding memory problems, such as memory leaks and segfaults.

In serial valgrind can simply by run as follows, with no need to recompile your binary

valgrind --tool=memcheck ./a.out

there are many useful flags such as --leak-check=yes and --show-reachable=yes that can be found by running valgrind --help on consulting the man pages.

Parallel with MPI

Valgrind can also be used in parallel, as documented http://valgrind.org/docs/manual/mc-manual.html#mc-manual.mpiwrap in a similar fashion, however a library needs to be preloaded firts.

LD_PRELOAD=/lib/valgrind/amd64-linux/libmpiwrap.so mpirun -np 2 valgrind ./a.out

Debugging

gdb/idb