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Subject: Re: [OMPI users] OpenMPI with bounds checking
From: Gabriele Fatigati (g.fatigati_at_[hidden])
Date: 2008-06-19 11:51:20


>does the gcc bounds checking stuff give you the possibility of saying "this
memory is ok"?

I think yes.

2008/6/19 Gabriele Fatigati <g.fatigati_at_[hidden]>:

> Just a moment:
>
> i didn't compile OpenMPI with bounds checking, but only my application.
> Problems with OMPI compiled with bound checking remains.
>
>
> 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
>>
>> _______________________________________________
>> users mailing list
>> users_at_[hidden]
>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>
>>
>
>
> --
> 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]
>

-- 
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]