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Subject: Re: [OMPI devel] regression with derived datatypes
From: Rolf vandeVaart (rvandevaart_at_[hidden])
Date: 2014-05-07 13:11:17


OK. So, I investigated a little more. I only see the issue when I am running with multiple ports enabled such that I have two openib BTLs instantiated. In addition, large message RDMA has to be enabled. If those conditions are not met, then I do not see the problem. For example:
FAILS:

Ø mpirun –np 2 –host host1,host2 –mca btl_openib_if_include mlx5_0:1,mlx5_0:2 –mca btl_openib_flags 3 MPI_Isend_ator_c
PASS:

Ø mpirun –np 2 –host host1,host2 –mca btl_openib_if_include mlx5_0:1 –mca btl_openib_flags 3 MPI_Isend_ator_c

Ø mpirun –np 2 –host host1,host2 –mca btl_openib_if_include_mlx5:0:1,mlx5_0:2 –mca btl_openib_flags 1 MPI_Isend_ator_c

So we must have some type of issue when we break up the message between the two openib BTLs. Maybe someone else can confirm my observations?
I was testing against the latest trunk.

Rolf

From: devel [mailto:devel-bounces_at_[hidden]] On Behalf Of Joshua Ladd
Sent: Wednesday, May 07, 2014 10:48 AM
To: Open MPI Developers
Subject: Re: [OMPI devel] regression with derived datatypes

Rolf,
This was run on a Sandy Bridge system with ConnectX-3 cards.
Josh

On Wed, May 7, 2014 at 10:46 AM, Joshua Ladd <jladd.mlnx_at_[hidden]<mailto:jladd.mlnx_at_[hidden]>> wrote:
Elena, can you run your reproducer on the trunk, please, and see if the problem persists?
Josh

On Wed, May 7, 2014 at 10:26 AM, Jeff Squyres (jsquyres) <jsquyres_at_[hidden]<mailto:jsquyres_at_[hidden]>> wrote:
On May 7, 2014, at 10:03 AM, Elena Elkina <elena.elkina_at_[hidden]<mailto:elena.elkina_at_[hidden]>> wrote:

> Yes, this commit is also in the trunk.
Yes, I understand that -- my question is: is this same *behavior* happening on the trunk. I.e., is there some other effect on the trunk that is causing the bad behavior to not occur?

> Best,
> Elena
>
>
> On Wed, May 7, 2014 at 5:45 PM, Jeff Squyres (jsquyres) <jsquyres_at_[hidden]<mailto:jsquyres_at_[hidden]>> wrote:
> Is this also happening on the trunk?
>
>
> Sent from my phone. No type good.
>
> On May 7, 2014, at 9:44 AM, "Elena Elkina" <elena.elkina_at_[hidden]<mailto:elena.elkina_at_[hidden]>> wrote:
>
>> Sorry,
>>
>> Fixes #4501: Datatype unpack code produces incorrect results in some case
>>
>> ---svn-pre-commit-ignore-below---
>>
>> r31370 [[BR]]
>> Reshape all the packing/unpacking functions to use the same skeleton. Rewrite the
>> generic_unpacking to take advantage of the same capabilitites.
>>
>> r31380 [[BR]]
>> Remove a non-necessary label.
>>
>> r31387 [[BR]]
>> Correctly save the displacement for the case where the convertor is not
>> completed. As we need to have the right displacement at the beginning
>> of the next call, we should save the position relative to the beginning
>> of the buffer and not to the last loop.
>>
>> Best regards,
>> Elena
>>
>>
>> On Wed, May 7, 2014 at 5:43 PM, Jeff Squyres (jsquyres) <jsquyres_at_[hidden]<mailto:jsquyres_at_[hidden]>> wrote:
>> Can you cite the branch and SVN r number?
>>
>> Sent from my phone. No type good.
>>
>> > On May 7, 2014, at 9:24 AM, "Elena Elkina" <elena.elkina_at_[hidden]<mailto:elena.elkina_at_[hidden]>> wrote:
>> >
>> > b531973419a056696e6f88d813769aa4f1f1aee6
>> _______________________________________________
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>
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--
Jeff Squyres
jsquyres_at_[hidden]<mailto:jsquyres_at_[hidden]>
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