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

[Philippe W. <phi...@sk...>]

Both dhat and massif are replacing the memory allocator.
So, as the memory fragmentation is very dependent on the 
allocator behaviour (and not only from the application malloc/free
pattern/behaviour), you will not get much additional information
from these tools that what you can certainly get from
ptmalloc2 itself (I guess it has some statistical reporting
and/or support mallinfo or similar).

Philippe


On Mon, 2014-05-26 at 12:15 +0200, 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
>  
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