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Thank you Hui for the reply. I was expecting to see RoCE messages in the packet capture. When I use verbs on libfabric sample tests, I see the RoCE messages as below : From: Zhou, Hui <zhouh@ anl. gov> Date: Wednesday, June 12, 2024 at
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<p class="MsoNormal"><span style="font-size:11.0pt">Thank you Hui for the reply.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I was expecting to see RoCE messages in the packet capture.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">When I use verbs on libfabric sample tests, I see the RoCE messages as below :
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><img width="1604" height="142" style="width:16.7083in;height:1.4791in" id="Picture_x0020_1" src="cid:image001.png@01DABCE1.0D6BE810"></span><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Zhou, Hui <zhouh@anl.gov><br>
<b>Date: </b>Wednesday, June 12, 2024 at 3:41</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> </span><span style="font-size:12.0pt;color:black">PM<br>
<b>To: </b>Niyaz Murshed <Niyaz.Murshed@arm.com>, discuss@mpich.org <discuss@mpich.org><br>
<b>Cc: </b>nd <nd@arm.com><br>
<b>Subject: </b>Re: Mpich over RDMA sample<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Niyaz,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt">ofi_rxm:verbs is the correct provider. The ofi_rxm provides the verbs provider additional messaging semantics that are needed to be used in MPI.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">-- <br>
Hui Zhou</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Niyaz Murshed <Niyaz.Murshed@arm.com><br>
<b>Date: </b>Wednesday, June 12, 2024 at 2:54</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> </span><span style="font-size:12.0pt;color:black">PM<br>
<b>To: </b>Zhou, Hui <zhouh@anl.gov>, discuss@mpich.org <discuss@mpich.org><br>
<b>Cc: </b>nd <nd@arm.com><br>
<b>Subject: </b>Re: Mpich over RDMA sample</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:1.0pt;color:white">Thank you for the reply. I did that; however, it selects ofi_rxm:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">verbs
libfabric:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">412098:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">1718221892:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">ofi_rxm:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">av:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">ofi_av_insert_addr():</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">313<info>
fi_addr: 1 libfabric:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">412099:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">1718221892:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">ofi_rxm:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">av:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">ofi_av_insert_addr():</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">313<info>
fi_addr:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">
</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">Thank you for the reply.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">I did that; however, it selects ofi_rxm:verbs</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="s1">libfabric:412098:1718221892::ofi_rxm:av:ofi_av_insert_addr():313<info> fi_addr: 1</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="s1">libfabric:412099:1718221892::ofi_rxm:av:ofi_av_insert_addr():313<info> fi_addr: 1</span><o:p></o:p></p>
<p class="p2" style="margin-left:.5in"> <o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="s1">options:</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="apple-converted-space"> </span>
<span class="s1">backend:</span><span class="apple-converted-space"> </span>
<span class="s1">cpu</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="apple-converted-space"> </span>
<span class="s1">iters:</span><span class="apple-converted-space"> </span>
<span class="s1">16</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="apple-converted-space"> </span>
<span class="s1">warmup_iters: </span><span class="apple-converted-space"> </span>
<span class="s1">16</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="apple-converted-space"> </span>
<span class="s1">cache:</span><span class="apple-converted-space"> </span>
<span class="s1">1</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="apple-converted-space"> </span>
<span class="s1">min_elem_count: 1</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="apple-converted-space"> </span>
<span class="s1">max_elem_count: 1</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="apple-converted-space"> </span>
<span class="s1">elem_counts:</span><span class="apple-converted-space"> </span>
<span class="s1">[1]</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="apple-converted-space"> </span>
<span class="s1">validate: </span><span class="apple-converted-space"> </span>
<span class="s1">last</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="apple-converted-space"> </span>
<span class="s1">window_size:</span><span class="apple-converted-space"> </span>
<span class="s1">64</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="s1">#------------------------------------------------------------</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="s1"># Benchmarking: Bandwidth</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="s1"># #processes: 2</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="s1">#------------------------------------------------------------</span><o:p></o:p></p>
<p class="p2" style="margin-left:.5in"> <o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="apple-converted-space">
</span><span class="s1">#bytes</span><span class="apple-converted-space"> </span>
<span class="s1">#repetitions</span><span class="apple-converted-space"> </span>
<span class="s1">Mbytes/sec</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="apple-converted-space">
</span><span class="s1">4</span><span class="apple-converted-space">
</span><span class="s1">16</span><span class="apple-converted-space">
</span><span class="s1">0.02</span><o:p></o:p></p>
<p class="p2" style="margin-left:.5in"> <o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="s1"># All done</span><o:p></o:p></p>
<p class="p2" style="margin-left:.5in"> <o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="s1">libfabric:412098:1718221892::ofi_rxm:ep_ctrl:rxm_stop_listen():864<info> stopping CM thread</span><o:p></o:p></p>
<p class="p1" style="margin-left:.5in"><span class="s1">libfabric:412099:1718221892::ofi_rxm:ep_ctrl:rxm_stop_listen():864<info> stopping CM thread</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">As per
<a href="https://urldefense.us/v3/__https:/www.intel.com/content/www/us/en/docs/mpi-library/developer-guide-linux/2021-6/ofi-providers-support.html__;!!G_uCfscf7eWS!YajPk9G-sPCEDt44nrZQrYG8r7V_s953AsKjQ4w_vW5OzcjJXfdGHOINW-PEYIw-IcISZSCw1xIsIoJ-dbE$">
https://www.intel.com/content/www/us/en/docs/mpi-library/developer-guide-linux/2021-6/ofi-providers-support.html</a> , we need to add FI_PROVIDER=^ofi_rxm , but if do that, it moves back to sockets provider.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">Is here a way to combine ^ofi_rxm and verbs</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Zhou, Hui <zhouh@anl.gov><br>
<b>Date: </b>Wednesday, June 12, 2024 at 2:41</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> </span><span style="font-size:12.0pt;color:black">PM<br>
<b>To: </b>Niyaz Murshed <Niyaz.Murshed@arm.com>, discuss@mpich.org <discuss@mpich.org><br>
<b>Cc: </b>nd <nd@arm.com><br>
<b>Subject: </b>Re: Mpich over RDMA sample</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">Niyaz,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">All you need to do is to set an environment variable `FI_PROVIDER=verbs`.</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">-- <br>
Hui Zhou</span><o:p></o:p></p>
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<b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Niyaz Murshed <Niyaz.Murshed@arm.com><br>
<b>Date: </b>Wednesday, June 12, 2024 at 1:23</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> </span><span style="font-size:12.0pt;color:black">PM<br>
<b>To: </b>Zhou, Hui <zhouh@anl.gov>, discuss@mpich.org <discuss@mpich.org><br>
<b>Cc: </b>nd <nd@arm.com><br>
<b>Subject: </b>Re: Mpich over RDMA sample</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:1.0pt;color:white">When testing with Libfabric, verbs provider is selected. I did have to use “-e msg -d mlx5_1” so that it selects verbs. I was checking if there is anything like that for
mpich sample tests. Else might need to do some hack in the code to force </span>
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:11.0pt">When testing with Libfabric, verbs provider is selected. I did have to use “-e msg -d mlx5_1” so that it selects verbs.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:11.0pt">I was checking if there is anything like that for mpich sample tests. Else might need to do some hack in the code to force the selection of verbs.</span><o:p></o:p></p>
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<b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Zhou, Hui <zhouh@anl.gov><br>
<b>Date: </b>Wednesday, June 12, 2024 at 1:15</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> </span><span style="font-size:12.0pt;color:black">PM<br>
<b>To: </b>discuss@mpich.org <discuss@mpich.org><br>
<b>Cc: </b>Niyaz Murshed <Niyaz.Murshed@arm.com>, nd <nd@arm.com><br>
<b>Subject: </b>Re: Mpich over RDMA sample</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:11.0pt">Libfabric support multiple providers. Sounds like it was selecting the sockets or tcp provider rather than a provider that support RoCE. I am not exactly sure whether the verbs provider
will do that. If you can confirm the provider using libfabric tests, then you can try forcing MPICH to use that provider by setting the FI_PROVIDER environment variable.</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">-- <br>
Hui Zhou</span><o:p></o:p></p>
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<b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Niyaz Murshed via discuss <discuss@mpich.org><br>
<b>Date: </b>Wednesday, June 12, 2024 at 9:03</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> </span><span style="font-size:12.0pt;color:black">AM<br>
<b>To: </b>discuss@mpich.org <discuss@mpich.org><br>
<b>Cc: </b>Niyaz Murshed <Niyaz.Murshed@arm.com>, nd <nd@arm.com><br>
<b>Subject: </b>[mpich-discuss] Mpich over RDMA sample</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:1.0pt;color:white">Hello, I am trying to learn about MPICH and its performance over RDMA. I am using libfabric and installed mpich using the below configure. ./configure --prefix=/opt/mpich/
--with-ofi=/opt/libfabric/ When I run any applications between 2 directly </span>
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<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black">Hello, </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black">I am trying to learn about MPICH and its performance over RDMA.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black">I am using libfabric and installed mpich using the below configure.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black">./</span><b><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:#CA3323">configure</span></b><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black"> --prefix=/opt/mpich/ --with-ofi=/opt/libfabric/</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black">When I run any applications between 2 directly connected servers having Mellanox NICs, I see that communication is happening over tcp and
not over RoCE.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black">Is there any way to test commination over RoCE ?</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black">For eg. I was able to test it for libfabric using the below sample that comes along with libfabric to test RMA.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black">Is there something similar for MPICH ? or use the current sample to use RoCE by some parameter?</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black">Server : </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black">fi_rma_bw -s 192.168.1.100 -e msg -d mlx5_1 -S 1024 -I 1 </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black">Client :</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:14.0pt;font-family:"Abadi",sans-serif;color:black">fi_rma_bw -s 192.168.1.200 -e msg -d mlx5_3 192.168.1.100 -S 1024 -I 1 </span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:11.0pt;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:11.0pt;color:black">Regards,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:11.0pt;color:black">Niyaz</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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