[mvapich-discuss] (no subject)
Sasso, John (GE Power & Water, Non-GE)
John1.Sasso at ge.com
Fri Oct 30 11:16:05 EDT 2015
Mike,
Thank you for the info. How did you pass that flag to FLUENT? Did you have to modify some script in the FLUENT installation?
--john
From: Michael Knox [mailto:mikeknox at lcse.umn.edu]
Sent: Thursday, October 29, 2015 9:15 AM
To: Sasso, John (GE Power & Water, Non-GE)
Cc: mvapich-discuss at cse.ohio-state.edu
Subject: Re:
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<mailto: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>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
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