Table of Contents
Valgrind
General options
Syntax: valgrind [options] <your-program> <args>
–db-attach=yes: to automatically attach gdb on errors–error-limit=no: to display all errors even if there are a lot of them–num-callers=50: to increase the maximum backtrace displayed
Tools
Memcheck
Memory checker (default tool).
Syntax: valgrind [–tool=memcheck] [options] <your-program> <args>
–leak-check=full: to completely analyse memory leaks–show-reachable=yes: to show the detail of reachable memory–track-origins=yes: to display where was allocated the “uninitialized value”
Massif
Memory profiling.
Syntax: valgrind –tool=massif [options] <your-program> <args> ; ms_print massif.<pid>
–time-unit=B: display results in bytes
Callgrind
Performance profiling, to find time taken in functions and number of calls of functions.
Syntax: valgrind –tool=callgrind <program-compiled-O2> <args> ; kcachegrind callgrind.out.xxxx ; calgrind_control
Cachegrind
CPU cache profiling, to find cache misses.
Syntax: valgrind –tool=cachegrind <program-compiled-O2> <args>
Always do profiling with optimization options of compiler, or you could optimize things that the compiler already automatically does.
