====== 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.