Qt 4.1 Memory Leak

**blackliteon** · 9th February 2006, 18:16

Originally Posted by Codepoet

We need another tool here: Valgrind gives only total statistics not time samples and peak memory usage. Does anybody know of such a tool?

You mean memory leak or speed ?

**Codepoet** · 9th February 2006, 18:52

Valgrind is slow, yes - but that is not the reason: Valgrind does not collect statistics about things like:

maximum amount of memory used
memory usage while the application runs
graph of used memory by elapsed time

These 66MB are the total amount of memory the program allocated during the whole run. But we are interested in how much did it use at any given time. That is a big difference since memory is freed again, then allocated and so on. We have many short lived objects.

At the moment I'm trying memprof but it crashes

**wysota** · 9th February 2006, 22:25

Limit resources which can be given to a single process to a known amount, and you'll get info if the limit was met. See manual for ulimit for details. Or try mpatrol. Or do your own statistics, for example by overriding new and delete and using LD_PRELOAD.

**Codepoet** · 10th February 2006, 13:47

When running plugandpaint under mpatrol it's horribly slow, even slower then valgrind. Somewhere in mpatrol seems to be a bug because I constantly get errors about memmove on freed memory

Nevertheless I've got some numbers: around 3.5 MB peak memory usage of plugandpaint

I'll probably write my own library because I need one for my own job in the long term.