Alexander, Note the v2.0 series is no more supported, and you should upgrade to v3.1, v3.0 or v2.1
You might have to force the tcp buffers size to 0 for optimal performances iirc, mpirun —mca btl_tcp_sndbuf_size 0 —mca btl_tcp_rcvbuf_size 0 ... (I am afk, so please confirm both parameter names and default values with ompi_info —all) If you upgrade to the latest version, default parameter is already optimal. Last but not least, the btl/tcp component uses all the available interfaces by default, so you might want to first restrict to a single interface mpirun —mca btl_tcp_if_include 192.168.0.0/24 ... Hope this helps ! Gilles On Wednesday, June 6, 2018, Alexander Supalov <alexander.supa...@gmail.com> wrote: > Hi everybody, > > I noticed that sockets do not seem to work properly in the Open MPI > version mentioned above. Intranode runs are OK. Internode, over 100-MBit > Ethernet, I can go only as high as 32 KiB in a simple MPI ping-pong kind of > benchmark. Before I start composing a full bug report: is this another > known issue? > > Here are the diagnostics under Ubuntu 16.04 LTS: > > papa@pete:~/Documents/Projects/Books/Inside/MPI/Source/openmpi-2.0.2-plain$ > mpirun --prefix > /home/papa/Documents/Projects/Books/Inside/MPI/Source/openmpi-2.0.2-installed > -map-by node -hostfile mpi.hosts -n 2 $PWD/pingpong1 > r = 0 bytes = 0 iters = 1 time = 0.0156577 > lat = 0.00782887 bw = 0 > r = 1 bytes = 0 iters = 1 time = 0.011045 > lat = 0.00552249 bw = 0 > r = 0 bytes = 1 iters = 1 time = 0.000459942 > lat = 0.000229971 bw = 4348.37 > r = 1 bytes = 1 iters = 1 time = 0.000268888 > lat = 0.000134444 bw = 7438.04 > r = 0 bytes = 2 iters = 1 time = 0.000386158 > lat = 0.000193079 bw = 10358.5 > r = 1 bytes = 2 iters = 1 time = 0.000253175 > lat = 0.000126587 bw = 15799.3 > r = 0 bytes = 4 iters = 1 time = 0.000388046 > lat = 0.000194023 bw = 20616.1 > r = 1 bytes = 4 iters = 1 time = 0.000235434 > lat = 0.000117717 bw = 33979.8 > r = 0 bytes = 8 iters = 1 time = 0.000354141 > lat = 0.00017707 bw = 45179.8 > r = 1 bytes = 8 iters = 1 time = 0.000240324 > lat = 0.000120162 bw = 66576.8 > r = 0 bytes = 16 iters = 1 time = 0.000350701 > lat = 0.000175351 bw = 91245.8 > r = 1 bytes = 16 iters = 1 time = 0.000184242 > lat = 9.2121e-05 bw = 173685 > r = 0 bytes = 32 iters = 1 time = 0.000351037 > lat = 0.000175518 bw = 182317 > r = 1 bytes = 32 iters = 1 time = 0.00025953 > lat = 0.000129765 bw = 246600 > r = 0 bytes = 64 iters = 1 time = 0.000425288 > lat = 0.000212644 bw = 300973 > r = 1 bytes = 64 iters = 1 time = 0.000241162 > lat = 0.000120581 bw = 530764 > r = 0 bytes = 128 iters = 1 time = 0.000401526 > lat = 0.000200763 bw = 637568 > r = 1 bytes = 128 iters = 1 time = 0.000279226 > lat = 0.000139613 bw = 916820 > r = 0 bytes = 256 iters = 1 time = 0.000436665 > lat = 0.000218332 bw = 1.17252e+06 > r = 1 bytes = 256 iters = 1 time = 0.000269657 > lat = 0.000134829 bw = 1.89871e+06 > r = 0 bytes = 512 iters = 1 time = 0.000496634 > lat = 0.000248317 bw = 2.06188e+06 > r = 1 bytes = 512 iters = 1 time = 0.000291029 > lat = 0.000145514 bw = 3.51855e+06 > r = 1 bytes = 1024 iters = 1 time = 0.000405219 r = > 0 bytes = 1024 iters = 1 time = 0.000672843 lat = > 0.000336421 bw = 3.0438e+06 > lat = 0.000202609 bw = 5.05406e+06 > r = 0 bytes = 2048 iters = 1 time = 0.000874569 > lat = 0.000437284 bw = 4.68345e+06 > r = 1 bytes = 2048 iters = 1 time = 0.000489308 > lat = 0.000244654 bw = 8.37101e+06 > r = 1 bytes = 4096 iters = 1 time = 0.000853111 > lat = 0.000426556 r = 0 bytes = 4096 iters = 1 time = > 0.00142215 lat = 0.000711077 bw = 5.76027e+06 > bw = 9.6025e+06 > r = 0 bytes = 8192 iters = 1 time = 0.00239346 > lat = 0.00119673 bw = 6.84531e+06 > r = 1 bytes = 8192 iters = 1 time = 0.00132503 > lat = 0.000662515 bw = 1.2365e+07 > r = 0 bytes = 16384 iters = 1 time = 0.004443 > lat = 0.0022215 bw = 7.37519e+06 > r = 1 bytes = 16384 iters = 1 time = 0.00255605 > lat = 0.00127803 bw = 1.28198e+07 > r = 1 bytes = 32768 iters = 1 r = 0 bytes = 32768 > iters = 1 time = 0.00812741 lat = 0.0040637 bw = > 8.06358e+06 > time = 0.0046272 lat = 0.0023136 bw = 1.41632e+07 > [pete:07038] *** Process received signal *** > [pete:07038] Signal: Segmentation fault (11) > [pete:07038] Signal code: (128) > [pete:07038] Failing at address: (nil) > [pete:07038] [ 0] /lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[ > 0x7f716325a390] > [pete:07038] [ 1] /home/papa/Documents/Projects/Books/Inside/MPI/Source/ > openmpi-2.0.2-installed/lib/openmpi/mca_pml_ob1.so(mca_ > pml_ob1_send_request_put+0x1b)[0x7f715a32192b] > [pete:07038] [ 2] /home/papa/Documents/Projects/Books/Inside/MPI/Source/ > openmpi-2.0.2-installed/lib/openmpi/mca_btl_tcp.so(+ > 0x7eae)[0x7f715a52deae] > [pete:07038] [ 3] /home/papa/Documents/Projects/Books/Inside/MPI/Source/ > openmpi-2.0.2-installed/lib/libopen-pal.so.20(opal_ > libevent2022_event_base_loop+0x7f3)[0x7f7162975ef3] > [pete:07038] [ 4] /home/papa/Documents/Projects/Books/Inside/MPI/Source/ > openmpi-2.0.2-installed/lib/libopen-pal.so.20(opal_progress+0x101)[ > 0x7f71629361b1] > [pete:07038] [ 5] /home/papa/Documents/Projects/Books/Inside/MPI/Source/ > openmpi-2.0.2-installed/lib/openmpi/mca_pml_ob1.so(mca_ > pml_ob1_send+0x2b5)[0x7f715a312a95] > [pete:07038] [ 6] /home/papa/Documents/Projects/Books/Inside/MPI/Source/ > openmpi-2.0.2-installed/lib/libmpi.so.20(PMPI_Send+0x14b)[0x7f71634d5ffb] > [pete:07038] [ 7] /home/papa/Documents/Projects/Books/Inside/MPI/Source/ > openmpi-2.0.2-plain/pingpong1[0x400b25] > [pete:07038] [ 8] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[ > 0x7f7162e9f830] > [pete:07038] [ 9] /home/papa/Documents/Projects/Books/Inside/MPI/Source/ > openmpi-2.0.2-plain/pingpong1[0x400999] > [pete:07038] *** End of error message *** > -------------------------------------------------------------------------- > mpirun noticed that process rank 0 with PID 0 on node pete exited on > signal 11 (Segmentation fault). > -------------------------------------------------------------------------- > > Host list: > > 192.168.178.31 > 192.168.178.32 > > Platform: > > Intel, Ubuntu 16.04 LTS on one side, Ubuntu 14.04 LTS on the other, Open > MPI 2.0. or 2.1.0 on both, 100-Mbit Ethernet in between. > > Note that I have to map by node in order to get internode connectivity > tested, otherwise I get an intranode run. A bit unexpected, given the host > file. > > Best regards. > > Alexander > >
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