Re: [OMPI devel] 32 bit issues (was: 32 bit support needs a maintainer)

[Brice Goglin via devel]

Hello




Brice




Le 12/02/2023 à 23:06, Yatindra Vaishnav via devel a écrit :

This seems to be the code for sharing the hwloc topology in shared memory. This whole thing was designed for very large virtual spaces (>=48bits on most CPUs) where it's easy to find a virtual memory area that is unused in all participating processes. I am not sure it's worth fixing on 32bits since it's not clear it'll often work there.

Hi Jeff,




Regards,

--Yatindra.

I created 32-bit environment and was able to see the issue in in PMIx. I’m attaching the screen shot here, please confirm. Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows

*From: *Jeff Squyres (jsquyres) <mailto:jsquy...@cisco.com>
*Sent: *Tuesday, February 7, 2023 2:13 PM

*To: *Yatindra Vaishnav <mailto:yatindr...@hotmail.com>; Open MPI Developers <mailto:devel@lists.open-mpi.org>

*Subject: *Re: 32 bit issues (was: 32 bit support needs a maintainer)

Be sure to see https://github.com/open-mpi/ompi/pull/11282#issuecomment-1421523518.

*From:*Jeff Squyres (jsquyres) <jsquy...@cisco.com>
*Sent:* Tuesday, February 7, 2023 4:07 PM

*Subject:* 32 bit issues (was: 32 bit support needs a maintainer)





*From:*Yatindra Vaishnav <yatindr...@hotmail.com>
*Sent:* Tuesday, February 7, 2023 4:02 PM

*Subject:* RE: [OMPI devel] 32 bit support needs a maintainer

Hi Jeff,

Where can I see the bugs of 32-bit support on OpenPMIx? I see this link:

*To:* Yatindra Vaishnav <yatindr...@hotmail.com>; Open MPI Developers <devel@lists.open-mpi.org> Just try to build Open PMIx -- by itself, not as embedded in Open MPI -- in 32 bit mode and you'll see the compile failures. I *think*​ that the PMIx's configure has a "if building in 32 bit mode, print a message that this is not supported and abort" (just like Open MPI).  You will need to remove that check in order to be able to compile Open PMIx in 32 bit mode. *To:* Open MPI Developers <devel@lists.open-mpi.org>; Jeff Squyres (jsquyres) <jsquy...@cisco.com> Memory Leaks · Issue #1276 · openpmix/openpmix (github.com) <https://github.com/openpmix/openpmix/issues>

Regards,

--Yatindra.

Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows

*From: *Yatindra Vaishnav via devel <mailto:devel@lists.open-mpi.org>
*Sent: *Monday, February 6, 2023 1:27 PM

*To: *Jeff Squyres (jsquyres) <mailto:jsquy...@cisco.com>; devel@lists.open-mpi.org

*Cc: *Yatindra Vaishnav <mailto:yatindr...@hotmail.com>
*Subject: *Re: [OMPI devel] 32 bit support needs a maintainer

Sure Jeff, Let me take a look.

*From: *Jeff Squyres (jsquyres) <mailto:jsquy...@cisco.com>
*Sent: *Monday, February 6, 2023 1:03 PM

*To: *Yatindra Vaishnav <mailto:yatindr...@hotmail.com>; devel@lists.open-mpi.org

*Subject: *Re: [OMPI devel] 32 bit support needs a maintainer

Ok.  OpenPMIx is the "bottom" of the stack of Open MPI --> PRRTE --> OpenPMIx, so fixing the 32 bit issues there first is what makes sense -- see https://docs.open-mpi.org/en/v5.0.x/installing-open-mpi/required-support-libraries.html#library-dependencies.

*From:*Yatindra Vaishnav <yatindr...@hotmail.com>
*Sent:* Monday, February 6, 2023 2:56 PM

*Subject:* RE: [OMPI devel] 32 bit support needs a maintainer

We have been trying to get Open MPI v5.0.0 out for quite a while, and seem to actually be getting closer to getting over the finish line.  So getting these fixes in sooner rather than later would be better. *To:* Jeff Squyres (jsquyres) <jsquy...@cisco.com>; devel@lists.open-mpi.org <devel@lists.open-mpi.org> Yes Jeff, I can give roughly 5-8 hours a week. And yes I can take care of OpenPMIx bugs first and will look into others afterwards? Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows

*From: *Jeff Squyres (jsquyres) <mailto:jsquy...@cisco.com>
*Sent: *Monday, February 6, 2023 11:48 AM
*Subject: *Re: [OMPI devel] 32 bit support needs a maintainer



*From:*Yatindra Vaishnav <yatindr...@hotmail.com>
*Sent:* Monday, February 6, 2023 10:57 AM

*Subject:* Re: [OMPI devel] 32 bit support needs a maintainer

Hi Jeff,



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*From:* Jeff Squyres (jsquyres) <jsquy...@cisco.com>
*Sent:* Monday, February 6, 2023 7:45 AM
*To:* devel@lists.open-mpi.org <devel@lists.open-mpi.org>
*Cc:* Yatindra Vaishnav <yatindr...@hotmail.com>
*Subject:* Re: [OMPI devel] 32 bit support needs a maintainer

Greetings Yatindra; thanks for responding.

Ok.  What kind of timeframe do you have to work on this? Will you be able to look into the OpenPMIx 32-bit bugs in the immediate future, and then start testing with PRRTE and Open MPI? *To:* Jeff Squyres (jsquyres) <jsquy...@cisco.com>; devel@lists.open-mpi.org <devel@lists.open-mpi.org> Nice to your response. And yes I responded to the same mail. I registered myself for OpenMPI development community. And I'm aware about the responsibilities. And I can setup a 32-bit VMs to do bug fixes and testing. I already have a server machine which I can help with. Just curious: are you replying in response to the discussion that just came up a few days ago on https://github.com/open-mpi/ompi/pull/11282 <https://github.com/open-mpi/ompi/pull/11282>, where we set the upcoming Open MPI v5.0's configure script to abort in 32-bit environments?  I.e., are you part of the Debian community?

Regardless, there are several aspects of 32 bit support that are needed:

  * Bug fixes in OpenPMIx
  * Potential bug fixes in PRRTE
  * Potential bug Open MPI
  * Testing of all 3 of the above





Is this something that you would be able to provide?


*Sent:* Sunday, February 5, 2023 2:32 AM
*To:* devel@lists.open-mpi.org <devel@lists.open-mpi.org>
*Cc:* Yatindra Vaishnav <yatindr...@hotmail.com>
*Subject:* [OMPI devel] 32 bit support needs a maintainer

Hi All,



Regards,

--Yatindra.

Specifically: we know that there are 32-bit bugs in OpenPMIx that need to be resolved.  As such, we stopped testing 32 bit in all 3 projects quite a while ago.  Hence, even when 32-bit support is re-enabled in OpenPMIx, other 32-bit bugs may surface in PRRTE and Open MPI that require fixing. There will also need to be continual testing of all 3 of these in 32-bit environments.  This likely doesn't mean writing new tests, but rather running at least some subset of our existing tests in 32 bit environments to ensure that everything works properly. *From:*devel <devel-boun...@lists.open-mpi.org> on behalf of Yatindra Vaishnav via devel <devel@lists.open-mpi.org> I’m Yatindra I would like to maintain this 32-bit support. I know I did come late in the party but would love to help for this. Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows

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