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Hi all, We have built the GPCNET 1.2 application against mvpaich2-2.3.7 (+ patch for Rockport). Frequently, when we run the network_load_test with MV2_USE_UD_ONLY=1, the application hangs. When we try to get back-traces of all the running applications,
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We have built the GPCNET 1.2 application against mvpaich2-2.3.7 (+ patch for Rockport). Frequently, when we run the network_load_test with MV2_USE_UD_ONLY=1, the application hangs. When we try to get back-traces of all the running applications,
the test unhangs and completes. We get the back-races by calling <b>gdb -batch -ex "attach $pid" -ex "bt" -ex "detach
</b>on every network_load_test process on every server.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We are looking for some guidance on how to debug this problem, for example, are there any other options that we should be setting, etc.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Note that the application runs with no issues if we us MV2_USE_UD_HYBRID=0 instead of MV2_USE_UD_ONLY=1. Also note that the results of the failed test seem reasonable. I’ve included output for the hang scenario as well as one where the
application run normally.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Tony Niro<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Example of run that hung/resumed:<o:p></o:p></p>
<p class="MsoNormal">________________________________________________<o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">user@dell-s13-h1[11:41:04] ~>/usr/bin/time --format="%e seconds" /opt/bm/hpc/mvapich2-2.3.7-wc-patched-ng/bin/mpiexec -np 1504 -f /home/user/mpi-host.cfg -env MV2_HOMOGENEOUS_CLUSTER=1 -env MV2_NDREG_ENTRIES_MAX=100000
-env MV2_NDREG_ENTRIES=50000 -env MV2_IBA_HCA=mlx5_0 -env MV2_SHMEM_COLL_NUM_COMM=64 -env MV2_UD_ZCOPY_NUM_RETRY=1000000 -env MV2_NUM_QP_PER_PORT=1 -env MV2_USE_UD_ONLY=1 /opt/bm/hpc/mvapich-GPCNET-1.2/network_load_test_tn<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[dell-s13-h21:mpi_rank_0][rdma_get_user_parameters] Cannot have more than one QP with UD_ONLY / Hybrid mode.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[dell-s13-h21:mpi_rank_0][rdma_get_user_parameters] Resetting MV2_NUM_QP_PER_PORT to 1.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">NetworkLoad Tests v1.2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Test with 1504 MPI ranks (47 nodes)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> 10 nodes running Network Tests<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> 37 nodes running Congestion Tests (min 9 nodes per congestor)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Legend<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> RR = random ring communication pattern<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Lat = latency<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> BW = bandwidth<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> BW+Sync = bandwidth with barrier<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+------------------------------------------------------------------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Isolated Network Tests |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Name | Avg | 99% | Units |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| RR Two-sided Lat (8 B) | 3.1 | 6.8 | usec |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| RR Two-sided BW+Sync (131072 B) | 282.1 | 189.9 | MiB/s/rank |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Multiple Allreduce (8 B) | 18.2 | 29.3 | usec |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+------------------------------------------------------------------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Network Tests running with Congestion Tests |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Name | Avg | 99% | Units |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| RR Two-sided Lat (8 B) | 3.7 | 11.5 | usec |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Courier New";color:#172B4D;background:#F4F5F7"><HANG>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Courier New";color:#172B4D;background:#F4F5F7"><attach debugger to all processes to get stack trace><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| RR Two-sided BW+Sync (131072 B) | 201.7 | 130.8 | MiB/s/rank |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Multiple Allreduce (8 B) | 21.0 | 38.1 | usec |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+------------------------------------------------------------------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Network Tests running with Congestion Tests - Key Results |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------------------------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Name | Congestion Impact Factor |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+----------------------+---------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| | Avg | 99% |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+----------------------+---------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| RR Two-sided Lat (8 B) | 1.2X | 1.7X |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+----------------------+---------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| RR Two-sided BW+Sync (131072 B) | 1.4X | 1.5X |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+----------------------+---------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Multiple Allreduce (8 B) | 1.2X | 1.3X |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+----------------------+---------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">4851.38 seconds<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">user@dell-s13-h1[13:07:00] ~><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Example of successful run<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">user@dell-s13-h1[11:20:50] ~>/usr/bin/time --format="%e seconds" /opt/bm/hpc/mvapich2-2.3.7-wc-patched-ng/bin/mpiexec -np 1504 -f /home/user/mpi-host.cfg -env MV2_HOMOGENEOUS_CLUSTER=1 -env MV2_NDREG_ENTRIES_MAX=100000
-env MV2_NDREG_ENTRIES=50000 -env MV2_IBA_HCA=mlx5_0 -env MV2_SHMEM_COLL_NUM_COMM=64 -env MV2_UD_ZCOPY_NUM_RETRY=1000000 -env MV2_NUM_QP_PER_PORT=1 -env MV2_USE_UD_ONLY=1 /opt/bm/hpc/mvapich-GPCNET-1.2/network_load_test_tn<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[dell-s13-h21:mpi_rank_0][rdma_get_user_parameters] Cannot have more than one QP with UD_ONLY / Hybrid mode.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[dell-s13-h21:mpi_rank_0][rdma_get_user_parameters] Resetting MV2_NUM_QP_PER_PORT to 1.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">NetworkLoad Tests v1.2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Test with 1504 MPI ranks (47 nodes)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> 10 nodes running Network Tests<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> 37 nodes running Congestion Tests (min 9 nodes per congestor)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Legend<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> RR = random ring communication pattern<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Lat = latency<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> BW = bandwidth<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> BW+Sync = bandwidth with barrier<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+------------------------------------------------------------------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Isolated Network Tests |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Name | Avg | 99% | Units |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| RR Two-sided Lat (8 B) | 3.0 | 6.8 | usec |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| RR Two-sided BW+Sync (131072 B) | 270.8 | 182.0 | MiB/s/rank |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Multiple Allreduce (8 B) | 19.0 | 29.8 | usec |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+------------------------------------------------------------------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Network Tests running with Congestion Tests |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Name | Avg | 99% | Units |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| RR Two-sided Lat (8 B) | 3.7 | 11.9 | usec |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| RR Two-sided BW+Sync (131072 B) | 188.0 | 122.5 | MiB/s/rank |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Multiple Allreduce (8 B) | 21.6 | 39.5 | usec |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------+--------------+--------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+------------------------------------------------------------------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Network Tests running with Congestion Tests - Key Results |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+--------------------------------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Name | Congestion Impact Factor |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+----------------------+---------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| | Avg | 99% |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+----------------------+---------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| RR Two-sided Lat (8 B) | 1.2X | 1.8X |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+----------------------+---------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| RR Two-sided BW+Sync (131072 B) | 1.4X | 1.5X |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+----------------------+---------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">| Multiple Allreduce (8 B) | 1.1X | 1.3X |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">+---------------------------------+----------------------+---------------------+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">204.81 seconds<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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