[mvapich-discuss] (no subject)
Michael Knox
mikeknox at lcse.umn.edu
Thu Oct 29 09:15:22 EDT 2015
Hi John,
I ran into very similar problems with some larger Fluent runs on a Mellanox
ConnectIB Infiniband cluster. We were using Platform MPI and XRC fixed the
issue. I can't answer either of your questions but I would also be curious
to know the answer.
The flag we needed to use was:
-e MPI_IBV_XRC=1
Mike
On Wed, Oct 28, 2015 at 12:56 PM, Sasso, John (GE Power & Water, Non-GE) <
John1.Sasso at ge.com> wrote:
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> Pardon if this has been addressed already, but I could not find the answer
> =
> after doing Google searches. I tried posing this question on the OpenMPI
> a=
> nd OpenFabrics mailing lists, but it was recommended I post to the MVAPICH
> =
> list given their focus on IB.
>
> We are in the process of analyzing and troubleshooting MPI jobs of
> increasi=
> ngly large scale (OpenMPI 1.6.5) which communicate over a Mellanox-based
> IB=
> fabric. At a sufficiently large scale (# cores) a job will end up
> failing=
> with errors similar to:
>
> [yyyyy][[56933,1],1904][connect/btl_openib_connect_oob.c:867:rml_recv_cb]
> e=
> rror in endpoint reply start connect
> [xxxxx:29318] 853 more processes have sent help message
> help-mpi-btl-openib=
> -cpc-base.txt / ibv_create_qp failed
>
> So I know we are running into some memory limitation (educated guess) when
> =
> queue pairs are being created to support such a huge mesh. We are now
> inve=
> stigating using the XRC transport to decrease memory consumption.
>
> Anyways, my questions are:
>
>
> 1. How do we determine HOW MUCH memory is being pinned by an MPI job
> =
> on a node? (If pmap, what exactly are we looking for?)
>
> 2. How do we determine WHERE these pinned memory regions are?
>
> We are running RedHat 6.x
>
> --john
>
>
>
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> <p class=3D"MsoNormal">Pardon if this has been addressed already, but I
> cou=
> ld not find the answer after doing Google searches. I tried posing
> th=
> is question on the OpenMPI and OpenFabrics mailing lists, but it was
> recomm=
> ended I post to the MVAPICH list given
> their focus on IB.<o:p></o:p></p>
> <p class=3D"MsoNormal"><o:p> </o:p></p>
> <p class=3D"MsoNormal">We are in the process of analyzing and
> troubleshooti=
> ng MPI jobs of increasingly large scale (OpenMPI 1.6.5) which communicate
> o=
> ver a Mellanox-based IB fabric. At a sufficiently large scale (#
> core=
> s) a job will end up failing with errors
> similar to:<o:p></o:p></p>
> <p class=3D"MsoNormal"><o:p> </o:p></p>
> <p
> class=3D"MsoNormal">[yyyyy][[56933,1],1904][connect/btl_openib_connect_o=
> ob.c:867:rml_recv_cb] error in endpoint reply start connect<o:p></o:p></p>
> <p class=3D"MsoNormal">[xxxxx:29318] 853 more processes have sent help
> mess=
> age help-mpi-btl-openib-cpc-base.txt / ibv_create_qp failed<o:p></o:p></p>
> <p class=3D"MsoNormal"><o:p> </o:p></p>
> <p class=3D"MsoNormal">So I know we are running into some memory
> limitation=
> (educated guess) when queue pairs are being created to support such a
> huge=
> mesh. We are now investigating using the XRC transport to decrease
> m=
> emory consumption.<o:p></o:p></p>
> <p class=3D"MsoNormal"><o:p> </o:p></p>
> <p class=3D"MsoNormal">Anyways, my questions are:<o:p></o:p></p>
> <p class=3D"MsoNormal"><o:p> </o:p></p>
> <p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0
> level=
> 1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">1.<span style=
> =3D"font:7.0pt "Times New
> Roman""> &=
> nbsp;
> </span></span><![endif]>How do we determine HOW MUCH memory is being
> pinned=
> by an MPI job on a node? (If pmap, what exactly are we looking
> for?)=
> <o:p></o:p></p>
> <p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0
> level=
> 1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">2.<span style=
> =3D"font:7.0pt "Times New
> Roman""> &=
> nbsp;
> </span></span><![endif]>How do we determine WHERE these pinned memory
> regio=
> ns are?<o:p></o:p></p>
> <p class=3D"MsoNormal"><o:p> </o:p></p>
> <p class=3D"MsoNormal">We are running RedHat 6.x<o:p></o:p></p>
> <p class=3D"MsoNormal"><o:p> </o:p></p>
> <p class=3D"MsoNormal"><b><span
> style=3D"font-size:10.0pt;font-family:"=
> ;Arial","sans-serif";color:#333333">--john</span></b><span
> s=
>
> tyle=3D"font-size:10.0pt;font-family:"Arial","sans-serif&quo=
> t;;color:#333333"><o:p></o:p></span></p>
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