[mvapich-discuss] Seeing segfault when CMA is disabled for CUDA device buffers

[Subramoni, Hari]

Hi, Akshay.

Can you try with "MV2_USE_EAGER_FAST_SEND=0"?

As you know, we do not recommend using basic MVAPICH2 for GPU-based testing or GPU-enabled applications. Please use MVAPICH2-GDR for this.


Regards,
Hari.

From: mvapich-discuss-bounces at cse.ohio-state.edu On Behalf Of Akshay Venkatesh
Sent: Wednesday, March 21, 2018 8:57 PM
To: mvapich-discuss at cse.ohio-state.edu <mvapich-discuss at mailman.cse.ohio-state.edu>
Subject: [mvapich-discuss] Seeing segfault when CMA is disabled for CUDA device buffers


Hi, Dr. Panda and Hari.



I'm using 2.3RC1 available here (http://mvapich.cse.ohio-state.edu/download/mvapich/mv2/mvapich2-2.3rc1.tar.gz) and trying to run osu_bcast with GPU buffers within a single node. I see the same error with osu_latency D D as well. CMA isn't available on the system so I'm disabling it.


$ mpirun_rsh -np 2 -hostfile hostfile MV2_SMP_USE_CMA=0 MV2_DEBUG_SHOW_BACKTRACE=1 ./get_local_rank mpi/collective/osu_bcast -d cuda

# OSU MPI-CUDA Broadcast Latency Test v5.4.1
# Size       Avg Latency(us)
[hsw0:mpi_rank_0][error_sighandler] Caught error: Segmentation fault (signal 11)
[hsw0:mpi_rank_0][print_backtrace]   0: $MPI_HOME/lib/libmpi.so.12(print_backtrace+0x2f) [0x7efc63d9d87f]
[hsw0:mpi_rank_0][print_backtrace]   1: $MPI_HOME/lib/libmpi.so.12(error_sighandler+0x63) [0x7efc63d9d9c3]
[hsw0:mpi_rank_0][print_backtrace]   2: /lib/x86_64-linux-gnu/libc.so.6(+0x354b0) [0x7efc61e9e4b0]
[hsw0:mpi_rank_0][print_backtrace]   3: /lib/x86_64-linux-gnu/libc.so.6(+0x14e02a) [0x7efc61fb702a]
[hsw0:mpi_rank_0][print_backtrace]   4: $MPI_HOME/lib/libmpi.so.12(mv2_smp_fast_write_contig+0x3fe) [0x7efc63d3dfce]
[hsw0:mpi_rank_0][print_backtrace]   5: $MPI_HOME/lib/libmpi.so.12(MPIDI_CH3_EagerContigShortSend+0xa5) [0x7efc63d24fa5]
[hsw0:mpi_rank_0][print_backtrace]   6: $MPI_HOME/lib/libmpi.so.12(MPID_Send+0x886) [0x7efc63d2e336]
[hsw0:mpi_rank_0][print_backtrace]   7: $MPI_HOME/lib/libmpi.so.12(MPIC_Send+0x57) [0x7efc63ccad47]
[hsw0:mpi_rank_0][print_backtrace]   8: $MPI_HOME/lib/libmpi.so.12(+0x7fe05) [0x7efc63a34e05]
[hsw0:mpi_rank_0][print_backtrace]   9: $MPI_HOME/lib/libmpi.so.12(MPIR_Bcast_intra+0x205) [0x7efc63a366d5]
[hsw0:mpi_rank_0][print_backtrace]  10: $MPI_HOME/lib/libmpi.so.12(MPIR_Bcast_index_tuned_intra_MV2+0x46b) [0x7efc63a9669b]
[hsw0:mpi_rank_0][print_backtrace]  11: $MPI_HOME/lib/libmpi.so.12(MPIR_Bcast_MV2+0xb9) [0x7efc63a94089]
[hsw0:mpi_rank_0][print_backtrace]  12: $MPI_HOME/lib/libmpi.so.12(MPIR_Bcast_intra+0x507) [0x7efc63a369d7]
[hsw0:mpi_rank_0][print_backtrace]  13: $MPI_HOME/lib/libmpi.so.12(MPIR_Bcast_index_tuned_intra_MV2+0x46b) [0x7efc63a9669b]
[hsw0:mpi_rank_0][print_backtrace]  14: $MPI_HOME/lib/libmpi.so.12(MPIR_Bcast_MV2+0xb9) [0x7efc63a94089]
[hsw0:mpi_rank_0][print_backtrace]  15: $MPI_HOME/lib/libmpi.so.12(MPIR_Bcast_impl+0x1b) [0x7efc63a3731b]
[hsw0:mpi_rank_0][print_backtrace]  16: $MPI_HOME/lib/libmpi.so.12(MPI_Bcast+0x601) [0x7efc63a37aa1]
[hsw0:mpi_rank_0][print_backtrace]  17: mpi/collective/osu_bcast() [0x401d43]
[hsw0:mpi_rank_0][print_backtrace]  18: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7efc61e89830]
[hsw0:mpi_rank_0][print_backtrace]  19: mpi/collective/osu_bcast() [0x402149]
[hsw0:mpispawn_0][readline] Unexpected End-Of-File on file descriptor 7. MPI process died?
[hsw0:mpispawn_0][mtpmi_processops] Error while reading PMI socket. MPI process died?
[hsw0:mpispawn_0][child_handler] MPI process (rank: 0, pid: 255621) terminated with signal 11 -> abort job
[hsw0:mpirun_rsh][process_mpispawn_connection] mpispawn_0 from node hsw0 aborted: Error while reading a PMI socket (4)

I'm using cuda-9.1 and configuring in the following way:

./configure --prefix=$PWD/install --enable-cuda --with-cuda=/usr/local/cuda-9.1

Please let me know if I'm missing a parameter or if there's a way to get around the problem.

Thanks
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