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Subject: Re: [OMPI users] OpenMPI with bounds checking
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-06-20 07:31:17


On Jun 19, 2008, at 11:47 AM, Gabriele Fatigati wrote:

> i didn't compile OpenMPI with bounds checking, but only my
> application. Problems with OMPI compiled with bound checking remains.

Were you checking only with the OMPI 1.2 series? If so, is there a
chance you could test with the OMPI trunk? If we do have real bounds
issues, it would be good to get them cleared up.

>
>
> 2008/6/19 Jeff Squyres <jsquyres_at_[hidden]>:
> On Jun 19, 2008, at 11:25 AM, Gabriele Fatigati wrote:
>
> Hi Jeff,
> i solved using Gigabit net and eth1 interface!
>
> So, there are problems beetween Infiniband and gcc with bound
> checking.
>
> This is probably not too surprising -- the IB driver gives back
> memory to the process that didn't come from malloc or other
> traditional memory allocators, and this can confuse bounds checkers,
> leading to false positives.
>
> In the upcoming v1.3 series, we added a whole pile of stuff to
> handle these kinds of false positives when running under valgrind.
> Just curious -- does the gcc bounds checking stuff give you the
> possibility of saying "this memory is ok"? (valgrind does; we use
> it for IB-driver allocated or initialized memory)
>
>
> --
> Jeff Squyres
> Cisco Systems
>
> _______________________________________________
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>
>
>
>
> --
> Gabriele Fatigati
>
> CINECA Systems & Tecnologies Department
>
> Supercomputing Group
>
> Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy
>
> www.cineca.it Tel: +39 051 6171722
>
> g.fatigati_at_[hidden] _______________________________________________
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-- 
Jeff Squyres
Cisco Systems