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<p class="MsoNormal">Sorry, my attachment with an .out extension was blocked. Here is the file with a .txt extension.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Mccall, Kurt E. (MSFC-EV41) <kurt.e.mccall@nasa.gov>
<br>
<b>Sent:</b> Thursday, February 17, 2022 2:36 PM<br>
<b>To:</b> discuss@mpich.org<br>
<b>Cc:</b> Mccall, Kurt E. (MSFC-EV41) <kurt.e.mccall@nasa.gov><br>
<b>Subject:</b> MPI_Init hangs under Slurm<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Things were working fine when I was launching 1 node jobs under Slurm 20.11.8, but when I launched a 20 node job, MPICH hangs in MPI_Init. The output of “mpiexec -verbose” is attached, and the stack trace at the point where it hangs is
below.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In the “mpiexec -verbose” output, I wonder why variables such as PATH_modshare point to our Intel MPI implementation, which I am no using. I am using MPICH 4.0 with a patch that Ken Raffenetti provided (which makes MPICH recognize the
“host” info key). My $PATH and $LD_LIBRARY_PATH variables definitely point to the correct MPICH installation.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I appreciate any help you can give.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here is the Slurm sbatch command:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">sbatch --nodes=20 --ntasks=20 --job-name $job_name --exclusive –verbose
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here is the mpiexec command:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">mpiexec -verbose -launcher ssh -print-all-exitcodes -np 20 -wdir ${work_dir} -env DISPLAY localhost:10.0 --ppn 1 <many more args…><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Stack trace at MPI_Init:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">#0 0x00007f6d85f499b2 in read () from /lib64/libpthread.so.0<o:p></o:p></p>
<p class="MsoNormal">#1 0x00007f6d87a5753a in PMIU_readline (fd=5, buf=buf@entry=0x7ffd6fb596e0 "", maxlen=maxlen@entry=1024)<o:p></o:p></p>
<p class="MsoNormal"> at ../mpich-slurm-patch-4.0/src/pmi/simple/simple_pmiutil.c:134<o:p></o:p></p>
<p class="MsoNormal">#2 0x00007f6d87a57a56 in GetResponse (request=0x7f6d87b48351 "cmd=barrier_in\n",<o:p></o:p></p>
<p class="MsoNormal"> expectedCmd=0x7f6d87b48345 "barrier_out", checkRc=0) at ../mpich-slurm-patch-4.0/src/pmi/simple/simple_pmi.c:818<o:p></o:p></p>
<p class="MsoNormal">#3 0x00007f6d87a29915 in MPIDI_PG_SetConnInfo (rank=rank@entry=0,<o:p></o:p></p>
<p class="MsoNormal"> connString=connString@entry=0x1bbf5a0 "description#n001$port#33403$ifname#172.16.56.1$")<o:p></o:p></p>
<p class="MsoNormal"> at ../mpich-slurm-patch-4.0/src/mpid/ch3/src/mpidi_pg.c:559<o:p></o:p></p>
<p class="MsoNormal">#4 0x00007f6d87a38611 in MPID_nem_init (pg_rank=pg_rank@entry=0, pg_p=pg_p@entry=0x1bbf850, has_parent=<optimized out>)<o:p></o:p></p>
<p class="MsoNormal"> at ../mpich-slurm-patch-4.0/src/mpid/ch3/channels/nemesis/src/mpid_nem_init.c:393<o:p></o:p></p>
<p class="MsoNormal">#5 0x00007f6d87a2ad93 in MPIDI_CH3_Init (has_parent=<optimized out>, pg_p=0x1bbf850, pg_rank=0)<o:p></o:p></p>
<p class="MsoNormal"> at ../mpich-slurm-patch-4.0/src/mpid/ch3/channels/nemesis/src/ch3_init.c:83<o:p></o:p></p>
<p class="MsoNormal">#6 0x00007f6d87a1b3b7 in init_world () at ../mpich-slurm-patch-4.0/src/mpid/ch3/src/mpid_init.c:190<o:p></o:p></p>
<p class="MsoNormal">#7 MPID_Init (requested=<optimized out>, provided=provided@entry=0x7f6d87e03540 <MPIR_ThreadInfo>)<o:p></o:p></p>
<p class="MsoNormal"> at ../mpich-slurm-patch-4.0/src/mpid/ch3/src/mpid_init.c:76<o:p></o:p></p>
<p class="MsoNormal">#8 0x00007f6d879828eb in MPII_Init_thread (argc=argc@entry=0x7ffd6fb5a5cc, argv=argv@entry=0x7ffd6fb5a5c0,<o:p></o:p></p>
<p class="MsoNormal"> user_required=0, provided=provided@entry=0x7ffd6fb5a574, p_session_ptr=p_session_ptr@entry=0x0)<o:p></o:p></p>
<p class="MsoNormal"> at ../mpich-slurm-patch-4.0/src/mpi/init/mpir_init.c:208<o:p></o:p></p>
<p class="MsoNormal">#9 0x00007f6d879832a5 in MPIR_Init_impl (argc=0x7ffd6fb5a5cc, argv=0x7ffd6fb5a5c0)<o:p></o:p></p>
<p class="MsoNormal"> at ../mpich-slurm-patch-4.0/src/mpi/init/mpir_init.c:93<o:p></o:p></p>
<p class="MsoNormal">#10 0x00007f6d8786388e in PMPI_Init (argc=0x7ffd6fb5a5cc, argv=0x7ffd6fb5a5c0)<o:p></o:p></p>
<p class="MsoNormal"> at ../mpich-slurm-patch-4.0/src/binding/c/init/init.c:46<o:p></o:p></p>
<p class="MsoNormal">#11 0x000000000040640d in main (argc=23, argv=0x7ffd6fb5ad68) at src/NeedlesMpiManagerMain.cpp:53<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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