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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Hi Niyaz,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">The mlx provider is only available as part of Intel MPI package, which is only available for x86.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">If you build libfabric from source, you can use the ucx provider instead. Similar to the mlx provider, the ucx provider runs on top of UCX.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">The verbs provider runs on top of IB Verbs. The domain name “mlx5_0” is the device name of Mellanox NIC. It has nothing to do with the mlx provider, nor UCX.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">The psm3 provider supports Intel NICs as well as Ethernet/IB/RoCE NICs from other vendors. Whether it is present on a machine depends on which package is installed. For example, if it is installed
as part of the Intel Ethernet Fabric Suite package, then it is only available for x86_64. You may try to build it from libfabric source on other platforms, by adding “—enable-psm3” to the libfabric “configure” command line. If configure fails, check the content
of “config.log” to see what is missing. This is an untested territory so I can’t guarantee that it will work.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">The third question has been answered off-line, so I won’t repeat here.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">-Jianxin<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif">From:</span></b><span style="font-family:"Calibri",sans-serif"> Libfabric-users <libfabric-users-bounces@lists.openfabrics.org>
<b>On Behalf Of </b>Niyaz Murshed<br>
<b>Sent:</b> Monday, May 6, 2024 6:16 PM<br>
<b>To:</b> libfabric-users@lists.openfabrics.org<br>
<b>Cc:</b> nd <nd@arm.com><br>
<b>Subject:</b> Re: [libfabric-users] Libfabric questions<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hello, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can some please share some knowledge on this <span style="font-family:"Segoe UI Emoji",sans-serif">
😊</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Niyaz<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></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">Libfabric-users <<a href="mailto:libfabric-users-bounces@lists.openfabrics.org">libfabric-users-bounces@lists.openfabrics.org</a>> on behalf of Niyaz Murshed <<a href="mailto:Niyaz.Murshed@arm.com">Niyaz.Murshed@arm.com</a>><br>
<b>Date: </b>Tuesday, April 30, 2024 at 10:16</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><a href="mailto:libfabric-users@lists.openfabrics.org">libfabric-users@lists.openfabrics.org</a> <<a href="mailto:libfabric-users@lists.openfabrics.org">libfabric-users@lists.openfabrics.org</a>><br>
<b>Subject: </b>[libfabric-users] Libfabric questions<o:p></o:p></span></p>
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<p class="MsoNormal">Hello all ,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I am trying to learn libfabric and have some basic questions. Please point me in the right direction.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I am running on ubuntu 22.04 with Mellanox ConnectX 7 NIC cards on an Arm platform (N1).<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><u>Question 1:</u><o:p></o:p></p>
<p class="MsoNormal">Is fi_mlx provider only available on x86?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Steps : <o:p></o:p></p>
<p class="MsoNormal">Installed UCX (as required in fi_mlx. <a href="https://ofiwg.github.io/libfabric/v1.8.0/man/fi_mlx.7.html">
https://ofiwg.github.io/libfabric/v1.8.0/man/fi_mlx.7.html</a>)<o:p></o:p></p>
<p class="p1"><span class="s1"># Library version: 1.18.0</span><o:p></o:p></p>
<p class="MsoNormal">Install libfabric<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">As per <a href="https://www.intel.com/content/www/us/en/developer/articles/technical/mpi-library-2019-over-libfabric.html">
https://www.intel.com/content/www/us/en/developer/articles/technical/mpi-library-2019-over-libfabric.html</a> this is only available for infiniband devices.<o:p></o:p></p>
<p class="MsoNormal">However, in one of the presentations, it shows mlx also supports RoCE (<a href="https://ibb.co/bPhm0dp">https://ibb.co/bPhm0dp</a>)<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Could you please confirm if MLX provider will work on RoCE ? Other than UCX, do we need to install anything else to enable MLX provider?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">In my current setup, I only see Verbs provider with doman : mlx<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Menlo",serif;color:black">provider: verbs</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Menlo",serif;color:black"> fabric: IB-0xfe80000000000000</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Menlo",serif;color:black"> domain: mlx5_0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Menlo",serif;color:black"> version: 121.0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Menlo",serif;color:black"> type: FI_EP_MSG</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Menlo",serif;color:black"> protocol: FI_PROTO_RDMA_CM_IB_RC</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Is Verbs->mlx equivalent to verbs api wrapper over mlx provider?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><u>Question 2:</u><o:p></o:p></p>
<p class="MsoNormal">Is PSM3 only available for intel NIC cards and only on x86 platform?<o:p></o:p></p>
<p class="MsoNormal">I have the same installation on x86 and Arm , however, I see on x86 platform, the intel NICs has the following enabled<o:p></o:p></p>
<p class="p1"><span class="s1">provider: psm3</span><o:p></o:p></p>
<p class="p1"><span class="apple-converted-space"> </span><span class="s1">fabric: TCP-10.118.91.0/24</span><o:p></o:p></p>
<p class="p1"><span class="apple-converted-space"> </span><span class="s1">domain: eno1</span><o:p></o:p></p>
<p class="p1"><span class="apple-converted-space"> </span><span class="s1">version: 306.10</span><o:p></o:p></p>
<p class="p1"><span class="apple-converted-space"> </span><span class="s1">type: FI_EP_RDM</span><o:p></o:p></p>
<p class="p1"><span class="apple-converted-space"> </span><span class="s1">protocol: FI_PROTO_PSMX3</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">The same is not present on Arm platform.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><u>Question 3:</u><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">My goal is to run rdma test between 2 application (RoCE).<o:p></o:p></p>
<p class="MsoNormal">I have 2 nics on the server, one on numa0 and another on numa1. I have a loop cable from nic1 to nic2.<o:p></o:p></p>
<p class="MsoNormal">How can I make sure that the data is transferred via the loop cable? Can this be done with fi_rma_bw app?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Niyaz<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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