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<p class=MsoNormal>We’re having a very odd problem with our fabric, where,
out of the entire cluster, machine “A” can’t run mvapich2
programs with machine “B”, and machine “C” can’t
run programs with machine “D” – even though “A”
can run with “D” and “B” can run with “C” –
and the rest of the fabric works fine.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>There are no IB errors anywhere on the fabric that I
can find, and the machines in question all work correctly with mvapich1 and
low-level IB tests.<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>The problem occurs whether using mpd or rsh.<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>3)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>If I attach to the running processes, both machines
appear to be waiting for a read operation to complete. (See below)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Can anyone make a suggestion on how to debug this? <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Stack trace for node 0:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>#0 0x000000361160abb5 in pthread_spin_lock () from
/lib64/libpthread.so.0<o:p></o:p></p>
<p class=MsoNormal>#1 0x00002aaaab08fb6c in mthca_poll_cq
(ibcq=0x2060980, ne=1,<o:p></o:p></p>
<p class=MsoNormal> wc=0x7fff9d835900) at src/cq.c:468<o:p></o:p></p>
<p class=MsoNormal>#2 0x00002aaaaab5d8d8 in MPIDI_CH3I_MRAILI_Cq_poll (<o:p></o:p></p>
<p class=MsoNormal> vbuf_handle=0x7fff9d8359d8, vc_req=0x0,
receiving=0, is_blocking=1)<o:p></o:p></p>
<p class=MsoNormal> at /usr/include/infiniband/verbs.h:934<o:p></o:p></p>
<p class=MsoNormal>#3 0x00002aaaaab177fa in MPIDI_CH3I_read_progress
(vc_pptr=0x7fff9d8359e0,<o:p></o:p></p>
<p class=MsoNormal> v_ptr=0x7fff9d8359d8, is_blocking=1) at
ch3_read_progress.c:143<o:p></o:p></p>
<p class=MsoNormal>#4 0x00002aaaaab17464 in MPIDI_CH3I_Progress
(is_blocking=1,<o:p></o:p></p>
<p class=MsoNormal> state=<value optimized out>) at
ch3_progress.c:202<o:p></o:p></p>
<p class=MsoNormal>#5 0x00002aaaaab5bc4e in MPIC_Wait
(request_ptr=0x2aaaaae19800)<o:p></o:p></p>
<p class=MsoNormal> at helper_fns.c:269<o:p></o:p></p>
<p class=MsoNormal>#6 0x00002aaaaab5c043 in MPIC_Sendrecv (sendbuf=0x217fc50,
sendcount=2,<o:p></o:p></p>
<p class=MsoNormal> sendtype=1275069445, dest=1, sendtag=7,
recvbuf=0x217fc58, recvcount=2,<o:p></o:p></p>
<p class=MsoNormal> recvtype=1275069445, source=1, recvtag=7,
comm=1140850688,<o:p></o:p></p>
<p class=MsoNormal> status=0x7fff9d835b60) at
helper_fns.c:125<o:p></o:p></p>
<p class=MsoNormal>#7 0x00002aaaaaafe387 in MPIR_Allgather
(sendbuf=<value optimized out>,<o:p></o:p></p>
<p class=MsoNormal> sendcount=<value optimized out>,
sendtype=1275069445, recvbuf=0x217fc50,<o:p></o:p></p>
<p class=MsoNormal> recvcount=2, recvtype=1275069445,
comm_ptr=0x2aaaaae1c1e0)<o:p></o:p></p>
<p class=MsoNormal> at allgather.c:192<o:p></o:p></p>
<p class=MsoNormal>#8 0x00002aaaaaafeff9 in PMPI_Allgather
(sendbuf=0xffffffffffffffff,<o:p></o:p></p>
<p class=MsoNormal> sendcount=2, sendtype=1275069445,
recvbuf=0x217fc50, recvcount=2,<o:p></o:p></p>
<p class=MsoNormal> recvtype=1275069445, comm=1140850688) at
allgather.c:866<o:p></o:p></p>
<p class=MsoNormal>---Type <return> to continue, or q <return> to
quit---<o:p></o:p></p>
<p class=MsoNormal>#9 0x00002aaaaab3b00b in PMPI_Comm_split
(comm=1140850688, color=0, key=0,<o:p></o:p></p>
<p class=MsoNormal> newcomm=0x2aaaaae1c2f4) at
comm_split.c:196<o:p></o:p></p>
<p class=MsoNormal>#10 0x00002aaaaab3cd84 in create_2level_comm
(comm=1140850688, size=2,<o:p></o:p></p>
<p class=MsoNormal> my_rank=<value optimized out>) at
create_2level_comm.c:142<o:p></o:p></p>
<p class=MsoNormal>#11 0x00002aaaaab6877d in PMPI_Init (argc=0x7fff9d835e7c,
argv=0x7fff9d835e70)<o:p></o:p></p>
<p class=MsoNormal> at init.c:146<o:p></o:p></p>
<p class=MsoNormal>#12 0x0000000000400b2f in main (argc=3, argv=0x7fff9d835fb8)
at bw.c:27<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Stack trace for node 1:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>#0 0x00002ac3cbdac2d2 in MPIDI_CH3I_read_progress
(vc_pptr=0x7fffdee81020,<o:p></o:p></p>
<p class=MsoNormal> v_ptr=0x7fffdee81018, is_blocking=1) at
ch3_read_progress.c:143<o:p></o:p></p>
<p class=MsoNormal>#1 0x00002ac3cbdabf44 in MPIDI_CH3I_Progress
(is_blocking=1,<o:p></o:p></p>
<p class=MsoNormal> state=<value optimized out>) at
ch3_progress.c:202<o:p></o:p></p>
<p class=MsoNormal>#2 0x00002ac3cbdf060e in MPIC_Wait
(request_ptr=0x2ac3cbfae2a0)<o:p></o:p></p>
<p class=MsoNormal> at helper_fns.c:269<o:p></o:p></p>
<p class=MsoNormal>#3 0x00002ac3cbdf0a03 in MPIC_Sendrecv
(sendbuf=0xf79028, sendcount=2,<o:p></o:p></p>
<p class=MsoNormal> sendtype=1275069445, dest=0, sendtag=7,
recvbuf=0xf79020, recvcount=4,<o:p></o:p></p>
<p class=MsoNormal> recvtype=1275069445, source=0, recvtag=7,
comm=1140850688,<o:p></o:p></p>
<p class=MsoNormal> status=0x7fffdee811a0) at
helper_fns.c:125<o:p></o:p></p>
<p class=MsoNormal>#4 0x00002ac3cbd92ddb in MPIR_Allgather
(sendbuf=<value optimized out>,<o:p></o:p></p>
<p class=MsoNormal> sendcount=<value optimized out>,
sendtype=1275069445, recvbuf=0xf79020,<o:p></o:p></p>
<p class=MsoNormal> recvcount=2, recvtype=1275069445,
comm_ptr=0x2ac3cbfb0c80)<o:p></o:p></p>
<p class=MsoNormal> at allgather.c:192<o:p></o:p></p>
<p class=MsoNormal>#5 0x00002ac3cbd93a45 in PMPI_Allgather
(sendbuf=0xffffffffffffffff,<o:p></o:p></p>
<p class=MsoNormal> sendcount=2, sendtype=1275069445,
recvbuf=0xf79020, recvcount=2,<o:p></o:p></p>
<p class=MsoNormal> recvtype=1275069445, comm=1140850688) at
allgather.c:866<o:p></o:p></p>
<p class=MsoNormal>#6 0x00002ac3cbdcf91b in PMPI_Comm_split
(comm=1140850688, color=1, key=0,<o:p></o:p></p>
<p class=MsoNormal> newcomm=0x2ac3cbfb0d94) at
comm_split.c:196<o:p></o:p></p>
<p class=MsoNormal>#7 0x00002ac3cbdd18f4 in create_2level_comm
(comm=1140850688, size=2,<o:p></o:p></p>
<p class=MsoNormal> my_rank=<value optimized out>) at
create_2level_comm.c:142<o:p></o:p></p>
<p class=MsoNormal>#8 0x00002ac3cbdfd0a5 in PMPI_Init
(argc=0x7fffdee814bc, argv=0x7fffdee814b0)<o:p></o:p></p>
<p class=MsoNormal> at init.c:146<o:p></o:p></p>
<p class=MsoNormal>---Type <return> to continue, or q <return> to
quit---<o:p></o:p></p>
<p class=MsoNormal>#9 0x0000000000400bcf in main (argc=3, argv=0x7fffdee815f8)
at bw.c:27<o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>--</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Michael
Heinz</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Principal
Engineer, Qlogic Corporation</span><span style='font-size:12.0pt;font-family:
"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>King
of Prussia, Pennsylvania</span><o:p></o:p></p>
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