Performance And Debugging Tools: GPC

Memory Profiling

Valgrind

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.

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

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

Debugging

gdb

GDB is solid source-language level serial debugger.