Re: [Valgrind-users] Query on Numa architecture friendly memory allocation profiling

[Josef W. <Jos...@gm...>]

Am 21.04.2015 um 11:35 schrieb rajsing mohapatro:
> This mail is to check if currently Valgrind  provides any tool/option
> which can be utilized to do profiling of a running process to know what
> % of memory allocation made by the process is NUMA optimized.

Not that I know of.

However, physical memory allocation as well as thread placement depends
on (dynamic) OS behavior. Thus, it may be impossible for a VG tool to
maintain a consistent view with the OS in general.

This said, applications may opt in to control thread placement
(sched_setaffinity), and may assume a "first touch policiy" for physical
memory allocation (ie. on first write to a memory page, this page gets
allocated in the memory module of the socket on which the current thread
is running on).

Cheers,
Josef


 By "NUMA
> optimized" allocation I mean, "if a process running on a processor of
> specific Node then through out its lifetime what amount of memory it
> allocates from local node(which is NUMA optimized way) and what % of
> allocation it make from remote NUMA node(which is not optimized way due
> to the latency overhead involved).
>  
> Benefits:
> This report will provide a good understanding of if a process is able to
> make full use of NUMA architecture performance benefits in terms of
> memory allocation. If not then it will allow the developer/Admins to
> fine tune their process/applications to be NUMA friendly in-terms of
> memory allocations.
>  
> Regards,
> Rajsing
>  
>  
> 
>  
> 
> 
> 
> 
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