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Not sure why it can't create shared memory. Do you have <code>/dev/shm</code>? Is it full?<br>
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Hui</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Niyaz Murshed <Niyaz.Murshed@arm.com><br>
<b>Sent:</b> Tuesday, July 2, 2024 10:09 AM<br>
<b>To:</b> Zhou, Hui <zhouh@anl.gov>; discuss@mpich.org <discuss@mpich.org>; Jenke, Joachim <jenke@itc.rwth-aachen.de><br>
<b>Cc:</b> nd <nd@arm.com><br>
<b>Subject:</b> Re: Custom rank for processes</font>
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Tried both ways but gives error. root@ ampere-altra-2-1: /# mpirun -np 5 -rankmap '(vector,1,1,0,0,0)' -hosts 192. 168. 2. 100,192. 168. 2. 200 /mpitutorial/tutorials/mpi-hello-world/code/mpi_hello_world Abort(678028815) on node 1: Fatal error in internal_Init:
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<p class="x_MsoNormal"><span style="font-size:11.0pt">Tried both ways but gives error.</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_p1"><span class="x_s1">root@ampere-altra-2-1:/# mpirun -np 5</span><span class="x_apple-converted-space">
</span><span class="x_s1">-rankmap '(vector,1,1,0,0,0)' </span><span class="x_apple-converted-space">
</span><span class="x_s1">-hosts 192.168.2.100,192.168.2.200 /mpitutorial/tutorials/mpi-hello-world/code/mpi_hello_world</span></p>
<p class="x_p1"><span class="x_s1">Abort(678028815) on node 1: Fatal error in internal_Init: Other MPI error, error stack:</span></p>
<p class="x_p1"><span class="x_s1">internal_Init(70).............: MPI_Init(argc=(nil), argv=(nil)) failed</span></p>
<p class="x_p1"><span class="x_s1">MPII_Init_thread(268).........:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIR_init_comm_world(34)......:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIR_Comm_commit(800).........:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIR_Comm_commit_internal(585):</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPID_Comm_commit_pre_hook(151):</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIDI_world_pre_init(638).....:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIDU_Init_shm_init(179)......: unable to allocate shared memory</span></p>
<p class="x_p1"><span class="x_s1">Abort(678028815) on node 3: Fatal error in internal_Init: Other MPI error, error stack:</span></p>
<p class="x_p1"><span class="x_s1">internal_Init(70).............: MPI_Init(argc=(nil), argv=(nil)) failed</span></p>
<p class="x_p1"><span class="x_s1">MPII_Init_thread(268).........:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIR_init_comm_world(34)......:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIR_Comm_commit(800).........:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIR_Comm_commit_internal(585):</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPID_Comm_commit_pre_hook(151):</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIDI_world_pre_init(638).....:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIDU_Init_shm_init(179)......: unable to allocate shared memory</span></p>
<p class="x_p2"> </p>
<p class="x_p2"> </p>
<p class="x_p1"><span class="x_s1">^C[mpiexec@ampere-altra-2-1] Sending Ctrl-C to processes as requested</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] Press Ctrl-C again to force abort</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] HYDU_sock_write (lib/utils/sock.c:250): write error (Bad file descriptor)</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] send_hdr_downstream (mpiexec/pmiserv_cb.c:28): sock write error</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] HYD_pmcd_pmiserv_send_signal (mpiexec/pmiserv_cb.c:218): unable to write data to proxy</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] ui_cmd_cb (mpiexec/pmiserv_pmci.c:61): unable to send signal downstream</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] HYDT_dmxu_poll_wait_for_event (lib/tools/demux/demux_poll.c:76): callback returned error status</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] HYD_pmci_wait_for_completion (mpiexec/pmiserv_pmci.c:173): error waiting for event</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] main (mpiexec/mpiexec.c:260): process manager error waiting for completion</span></p>
<p class="x_p1"><span class="x_s1"> </span></p>
<p class="x_p1"><span class="x_s1"> </span></p>
<p class="x_p1"><span class="x_s1"> </span></p>
<p class="x_p1"><span class="x_s1">root@ampere-altra-2-1:/# mpirun -np 5</span><span class="x_apple-converted-space">
</span><span class="x_s1">-rankmap 1,1,0,0,0 </span><span class="x_apple-converted-space">
</span><span class="x_s1">-hosts 192.168.2.100,192.168.2.200 /mpitutorial/tutorials/mpi-hello-world/code/mpi_hello_world</span></p>
<p class="x_p1"><span class="x_s1">Abort(678028815) on node 1: Fatal error in internal_Init: Other MPI error, error stack:</span></p>
<p class="x_p1"><span class="x_s1">internal_Init(70).............: MPI_Init(argc=(nil), argv=(nil)) failed</span></p>
<p class="x_p1"><span class="x_s1">MPII_Init_thread(268).........:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIR_init_comm_world(34)......:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIR_Comm_commit(800).........:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIR_Comm_commit_internal(585):</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPID_Comm_commit_pre_hook(151):</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIDI_world_pre_init(638).....:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIDU_Init_shm_init(179)......: unable to allocate shared memory</span></p>
<p class="x_p1"><span class="x_s1">Abort(678028815) on node 3: Fatal error in internal_Init: Other MPI error, error stack:</span></p>
<p class="x_p1"><span class="x_s1">internal_Init(70).............: MPI_Init(argc=(nil), argv=(nil)) failed</span></p>
<p class="x_p1"><span class="x_s1">MPII_Init_thread(268).........:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIR_init_comm_world(34)......:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIR_Comm_commit(800).........:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIR_Comm_commit_internal(585):</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPID_Comm_commit_pre_hook(151):</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIDI_world_pre_init(638).....:</span><span class="x_apple-converted-space"> </span></p>
<p class="x_p1"><span class="x_s1">MPIDU_Init_shm_init(179)......: unable to allocate shared memory</span></p>
<p class="x_p1"><span class="x_s1">^C[mpiexec@ampere-altra-2-1] Sending Ctrl-C to processes as requested</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] Press Ctrl-C again to force abort</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] HYDU_sock_write (lib/utils/sock.c:250): write error (Bad file descriptor)</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] send_hdr_downstream (mpiexec/pmiserv_cb.c:28): sock write error</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] HYD_pmcd_pmiserv_send_signal (mpiexec/pmiserv_cb.c:218): unable to write data to proxy</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] ui_cmd_cb (mpiexec/pmiserv_pmci.c:61): unable to send signal downstream</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] HYDT_dmxu_poll_wait_for_event (lib/tools/demux/demux_poll.c:76): callback returned error status</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] HYD_pmci_wait_for_completion (mpiexec/pmiserv_pmci.c:173): error waiting for event</span></p>
<p class="x_p1"><span class="x_s1">[mpiexec@ampere-altra-2-1] main (mpiexec/mpiexec.c:260): process manager error waiting for completion</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
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<p class="x_MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">Zhou, Hui <zhouh@anl.gov><br>
<b>Date: </b>Monday, July 1, 2024 at 9:39</span><span style="font-family:"Arial",sans-serif; color:black"> </span><span style="color:black">PM<br>
<b>To: </b>Niyaz Murshed <Niyaz.Murshed@arm.com>, discuss@mpich.org <discuss@mpich.org>, Jenke, Joachim <jenke@itc.rwth-aachen.de><br>
<b>Cc: </b>nd <nd@arm.com><br>
<b>Subject: </b>Re: Custom rank for processes</span></p>
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<p class="x_MsoNormal"><span style="color:black">Use quote. Try </span><code><span style="font-size:10.0pt; color:black">-rankmap '(vector,1,1,0,0,0)'</span></code><span style="font-family:"Arial",sans-serif; color:black"></span><span style="color:black">.</span></p>
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<p class="x_MsoNormal"><span style="color:black">Actually, the </span><code><span style="font-size:10.0pt; color:black">vector</span></code><span style="font-family:"Arial",sans-serif; color:black"></span><span style="color:black"> part is optional, so this
should also work: </span><code><span style="font-size:10.0pt; color:black">-rankmap 1,1,0,0,0</span></code><span style="font-family:"Arial",sans-serif; color:black"></span><span style="color:black">.</span></p>
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<p class="x_MsoNormal"><span style="color:black">--</span></p>
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<p class="x_MsoNormal"><span style="color:black">Hui</span></p>
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<p class="x_MsoNormal"><b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:black">From:</span></b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:black"> Niyaz Murshed <Niyaz.Murshed@arm.com><br>
<b>Sent:</b> Monday, July 1, 2024 9:11 PM<br>
<b>To:</b> discuss@mpich.org <discuss@mpich.org>; Zhou, Hui <zhouh@anl.gov>; Jenke, Joachim <jenke@itc.rwth-aachen.de><br>
<b>Cc:</b> nd <nd@arm.com><br>
<b>Subject:</b> Re: Custom rank for processes</span> </p>
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<p class="x_MsoNormal" style=""><span style="font-size:1.0pt; color:white">I get the below error when trying.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">. am I trying it
worng? root@</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">ampere-altra-2-1:</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">/#
mpirun -np 5 -hosts 192.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">168.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">2.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">100,192.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">168.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">2.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">200
-rankmap (vector,1,1,0,0,0) /mpitutorial/tutorials/mpi-hello-world/code/mpi_hello_world bash: syntax error near
</span></p>
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<p class="x_xmsonormal"><span style="font-size:11.0pt">I get the below error when trying.. am I trying it worng?</span></p>
<p class="x_xmsonormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_xmsonormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_xp1"><span class="x_xs1">root@ampere-altra-2-1:/# mpirun </span><span class="x_xapple-converted-space">
</span><span class="x_xs1">-np 5</span><span class="x_xapple-converted-space"> </span>
<span class="x_xs1">-hosts 192.168.2.100,192.168.2.200 </span><span class="x_xapple-converted-space">
</span><span class="x_xs1">-rankmap (vector,1,1,0,0,0)</span><span class="x_xapple-converted-space">
</span><span class="x_xs1">/mpitutorial/tutorials/mpi-hello-world/code/mpi_hello_world</span></p>
<p class="x_xp1"><span class="x_xs1">bash: syntax error near unexpected token `('</span></p>
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<p class="x_xmsonormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">Niyaz Murshed via discuss <discuss@mpich.org><br>
<b>Date: </b>Monday, July 1, 2024 at 4:42</span><span style="font-family:"Arial",sans-serif; color:black"> </span><span style="color:black">PM<br>
<b>To: </b>Zhou, Hui <zhouh@anl.gov>, discuss@mpich.org <discuss@mpich.org>, Jenke, Joachim <jenke@itc.rwth-aachen.de><br>
<b>Cc: </b>Niyaz Murshed <Niyaz.Murshed@arm.com>, nd <nd@arm.com><br>
<b>Subject: </b>Re: [mpich-discuss] Custom rank for processes</span></p>
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<p class="x_xmsonormal"><span style="font-size:1.0pt; color:white">Thank you so much Hui. Really appreciate it. I now understand it. From: Zhou, Hui <zhouh@</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">anl.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">gov>
Date: Monday, July 1, 2024 at 4:</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">37 PM To: Niyaz Murshed <Niyaz.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">Murshed@</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">arm.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">com>,
discuss@</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">mpich.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">org
<discuss@</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">mpich.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">org>,
Jenke, </span></p>
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<p class="x_xmsonormal"><span style="font-size:11.0pt">Thank you so much Hui. Really appreciate it. I now understand it.</span></p>
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<p class="x_xmsonormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">Zhou, Hui <zhouh@anl.gov><br>
<b>Date: </b>Monday, July 1, 2024 at 4:37</span><span style="font-family:"Arial",sans-serif; color:black"> </span><span style="color:black">PM<br>
<b>To: </b>Niyaz Murshed <Niyaz.Murshed@arm.com>, discuss@mpich.org <discuss@mpich.org>, Jenke, Joachim <jenke@itc.rwth-aachen.de><br>
<b>Cc: </b>nd <nd@arm.com><br>
<b>Subject: </b>Re: Custom rank for processes</span></p>
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<p class="x_xmsonormal"><span style="color:black">Yes, you can use rankmap to simply list out the node assignment for each rank. "-rankmap (vector,1,1,0,0,0)" is a list of 5 node ids, one for each rank. So rank 0 gets node 1, rank 1 gets node 1, rank 2 gets
node 0, and so on.</span></p>
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<p class="x_xmsonormal"><span style="color:black">The -hosts options is convenient if you have somewhat uniform assignment. If you want arbitrary assignment, just use -rankmap option.</span></p>
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<p class="x_xmsonormal"><span style="color:black">--</span></p>
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<p class="x_xmsonormal"><span style="color:black">Hui</span></p>
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<p class="x_xmsonormal"><b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:black">From:</span></b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:black"> Niyaz Murshed <Niyaz.Murshed@arm.com><br>
<b>Sent:</b> Monday, July 1, 2024 4:30 PM<br>
<b>To:</b> Zhou, Hui <zhouh@anl.gov>; discuss@mpich.org <discuss@mpich.org>; Jenke, Joachim <jenke@itc.rwth-aachen.de><br>
<b>Cc:</b> nd <nd@arm.com><br>
<b>Subject:</b> Re: Custom rank for processes</span> </p>
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<p class="x_xmsonormal"><span style="font-size:1.0pt; color:white">Sorry to bother you again with silly questions. How do I read the below : -rankmap (vector,1,1,0,0,0) I have 5 processes. 1 1 => means node1 will get first 2 processes ? -hosts 192.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">168.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">2.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">100:</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">2,192.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">168.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">2.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">200:</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">3
: this will give 2 process in </span></p>
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<p class="x_xxmsonormal"><span style="font-size:11.0pt">Sorry to bother you again with silly questions.</span></p>
<p class="x_xxmsonormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_xxmsonormal"><span style="font-size:11.0pt">How do I read the below :
</span></p>
<p class="x_xxmsonormal"><span style="color:black; background:white">-rankmap (vector,1,1,0,0,0)</span></p>
<p class="x_xxmsonormal"><span style="color:black; background:white"> </span></p>
<p class="x_xxmsonormal"><span style="color:black; background:white">I have 5 processes. 1 1 => means node1 will get first 2 processes ?
</span></p>
<p class="x_xxmsonormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_xxmsonormal"><span style="color:black">-hosts 192.168.2.100:2,192.168.2.200:3 : this will give 2 process in 100 and 3 in 200 .. Still won’t be able to specify which ranks goes to which node. Rank0 will be on node 100 .. what If I want Rank0 on node
200?</span></p>
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<p class="x_xxmsonormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">Zhou, Hui <zhouh@anl.gov><br>
<b>Date: </b>Monday, July 1, 2024 at 4:09</span><span style="font-family:"Arial",sans-serif; color:black"> </span><span style="color:black">PM<br>
<b>To: </b>Niyaz Murshed <Niyaz.Murshed@arm.com>, discuss@mpich.org <discuss@mpich.org>, Jenke, Joachim <jenke@itc.rwth-aachen.de><br>
<b>Cc: </b>nd <nd@arm.com><br>
<b>Subject: </b>Re: Custom rank for processes</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> root@ampere-altra-2-1:/# mpirun -n 5 -bind-to user:10,11,12,13 -hosts 192.168.2.200,192.168.2.100 /mpitutorial/tutorials/mpi-hello-world/code/mpi_hello_world</span></p>
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<p class="x_xxmsonormal"><span style="color:black">Hello world from processor ampere-altra-2-1, rank 1 out of 5 processors</span></p>
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<p class="x_xxmsonormal"><span style="color:black">Hello world from processor ampere-altra-2-1, rank 3 out of 5 processors</span></p>
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<p class="x_xxmsonormal"><span style="color:black">Hello world from processor dpr740, rank 0 out of 5 processors</span></p>
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<p class="x_xxmsonormal"><span style="color:black">Hello world from processor dpr740, rank 4 out of 5 processors</span></p>
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<p class="x_xxmsonormal"><span style="color:black">Hello world from processor dpr740, rank 2 out of 5 processors</span></p>
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<p class="x_xxmsonormal"><span style="color:black"> </span></p>
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<p class="x_xxmsonormal"><span style="color:black">> -bind-to user:10,11,12,13</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> This would mean on host 192.168.2.100</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> P0=>10 , P2=>11</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> This would mean on host 192.168.2.200</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> P0=>10 , P2=>11, P3=12</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> Is this correct understanding ? Is it also possible to say which rank process will be pinned to which core ?<br>
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Yes, that is correct. The ranks are assigned to hosts as shown in the hello world output.</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> About the rankmap:, trying to understand if I can select where a particular rank would be from > list of hosts. Currently, the first host in the list always get rank0.</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> Can I specify the below ranks?</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> mpirun -n 5 -bind-to user:10,11,12,13 -hosts 192.168.2.200,192.168.2.100 /mpitutorial/tutorials/mpi-hello-world/code/mpi_hello_world</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> </span></p>
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<p class="x_xxmsonormal"><span style="color:black">> Hello world from processor ampere-altra-2-1, rank 1 out of 5 processors => rank0</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> Hello world from processor ampere-altra-2-1, rank 3 out of 5 processors. => rank1</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> Hello world from processor dpr740, rank 0 out of 5 processors =>rank2</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> Hello world from processor dpr740, rank 4 out of 5 processors =>rank3</span></p>
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<p class="x_xxmsonormal"><span style="color:black">> Hello world from processor dpr740, rank 2 out of 5 processors =>rank4<br>
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Yes. You can use "-rankmap (vector,1,1,0,0,0)". Alternatively, you can use "-hosts 192.168.2.100:2,192.168.2.200:3", the colon syntax specifies how many processes you want to assign to each host.</span></p>
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<p class="x_xxmsonormal"><span style="color:black"> </span></p>
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<p class="x_xxmsonormal"><span style="color:black">--</span></p>
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<p class="x_xxmsonormal"><span style="color:black">Hui</span></p>
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