Re: [Valgrind-users] DHAT, MASSIF, External_Fragmentation

[Milian W. <ma...@mi...>]

On Monday 26 May 2014 12:15:32 Rentas Dimitris wrote:
> Hello to the community once more.
> My concern is if I can use DHAT and MASSIF to measure the external
> fragmentation of my application which is using the default Ubuntu 
ptmalloc2
> allocator.
> I have found a several formulas on the paper The Memory Fragmentation
> Problem : Solved?, most of them use the live memory, maximum amount 
of
> memory used by the allocator, maximum amount requested by the 
program.
> How can I interpret the DHAT and MASSIF output to get those values?
> In case you have any other suggestion for another formula please let me
> know.
> 
> I am aware that the most common way is to find the largest free 
contiguous
> block in heap, relative to the total heap amount. But I have not figured
> out how to get this measurement.
> 
> If you have any information or tip it will be a real great help.
> 
> Thank you everyone in advance

Also take a look at mallinfo from malloc.h. It will give you information on the 
fragmentation when you compare .keepcost vs. .uordblks.

Bye

-- 
Milian Wolff
ma...@mi...
http://milianw.de