{"action":"created","comment":{"url":"https://api.github.com/repos/pytorch/pytorch/pulls/comments/190412581","pull_request_review_id":122782320,"id":190412581,"diff_hunk":"@@ -0,0 +1,281 @@\n+#include \"ProcessGroupMPI.hpp\"\n+\n+#include <iostream>\n+#include <map>\n+#include \"mpi-ext.h\" // Needed for CUDA-sware check\n+\n+namespace c10d {\n+\n+#define MPI_CHECK(cmd)                                                   \\\n+  do {                                                                   \\\n+    int mpiStatus = cmd;                                                 \\\n+    if (mpiStatus != MPI_SUCCESS) {                                      \\\n+      std::string err = \"MPI error in: \" + std::string(__FILE__) + \":\" + \\\n+          std::to_string(__LINE__) +                                     \\\n+          \", with error code: \" + std::to_string(mpiStatus);             \\\n+      std::cerr << err << std::endl;                                     \\","path":"torch/lib/c10d/ProcessGroupMPI.cpp","position":16,"original_position":16,"commit_id":"0f2296bb5ca6191632e76fda2b5c21b86de87a43","original_commit_id":"0f2296bb5ca6191632e76fda2b5c21b86de87a43","user":{"login":"pietern","id":9845,"avatar_url":"https://avatars3.githubusercontent.com/u/9845?v=4","gravatar_id":"","url":"https://api.github.com/users/pietern","html_url":"https://github.com/pietern","followers_url":"https://api.github.com/users/pietern/followers","following_url":"https://api.github.com/users/pietern/following{/other_user}","gists_url":"https://api.github.com/users/pietern/gists{/gist_id}","starred_url":"https://api.github.com/users/pietern/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pietern/subscriptions","organizations_url":"https://api.github.com/users/pietern/orgs","repos_url":"https://api.github.com/users/pietern/repos","events_url":"https://api.github.com/users/pietern/events{/privacy}","received_events_url":"https://api.github.com/users/pietern/received_events","type":"User","site_admin":false},"body":"Remove write to std::cerr?","created_at":"2018-05-23T22:00:29Z","updated_at":"2018-05-23T22:12:22Z","html_url":"https://github.com/pytorch/pytorch/pull/7783#discussion_r190412581","pull_request_url":"https://api.github.com/repos/pytorch/pytorch/pulls/7783","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/pytorch/pytorch/pulls/comments/190412581"},"html":{"href":"https://github.com/pytorch/pytorch/pull/7783#discussion_r190412581"},"pull_request":{"href":"https://api.github.com/repos/pytorch/pytorch/pulls/7783"}}},"pull_request":{"url":"https://api.github.com/repos/pytorch/pytorch/pulls/7783","id":189858173,"html_url":"https://github.com/pytorch/pytorch/pull/7783","diff_url":"https://github.com/pytorch/pytorch/pull/7783.diff","patch_url":"https://github.com/pytorch/pytorch/pull/7783.patch","issue_url":"https://api.github.com/repos/pytorch/pytorch/issues/7783","number":7783,"state":"open","locked":false,"title":"[WIP] [c10d] Bare minimum MPI Process Group Implementation","user":{"login":"teng-li","id":8120856,"avatar_url":"https://avatars2.githubusercontent.com/u/8120856?v=4","gravatar_id":"","url":"https://api.github.com/users/teng-li","html_url":"https://github.com/teng-li","followers_url":"https://api.github.com/users/teng-li/followers","following_url":"https://api.github.com/users/teng-li/following{/other_user}","gists_url":"https://api.github.com/users/teng-li/gists{/gist_id}","starred_url":"https://api.github.com/users/teng-li/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/teng-li/subscriptions","organizations_url":"https://api.github.com/users/teng-li/orgs","repos_url":"https://api.github.com/users/teng-li/repos","events_url":"https://api.github.com/users/teng-li/events{/privacy}","received_events_url":"https://api.github.com/users/teng-li/received_events","type":"User","site_admin":false},"body":"This provides a bare-minimum MPI Process Group implementation, the commit is on top of @pietern's Gloo Process Group PR.\r\n\r\nIncluded in the commit: (https://github.com/pytorch/pytorch/pull/7783/commits/91cdd104e7bac5e6ab545f85d72bae30b778e81e)\r\n```\r\nProcessGroupMPI.hpp\r\nProcessGroupMPI.cpp\r\ntest/ProcessGroupMPITest.cpp\r\nCMakeLists.txt changes\r\n```\r\n\r\nBuild: will automatically detect MPI lib and build if MPI is found\r\n```\r\ncmake ../ -DCMAKE_INSTALL_PREFIX=\"$PWD/../../tmp_install\"\r\n-- The C compiler identification is GNU 4.8.5\r\n-- The CXX compiler identification is GNU 4.8.5\r\n-- Check for working C compiler: /private/home/tengli/miniconda3/envs/cuda9/bin/cc\r\n-- Check for working C compiler: /private/home/tengli/miniconda3/envs/cuda9/bin/cc -- works\r\n-- Detecting C compiler ABI info\r\n-- Detecting C compiler ABI info - done\r\n-- Detecting C compile features\r\n-- Detecting C compile features - done\r\n-- Check for working CXX compiler: /private/home/tengli/miniconda3/envs/cuda9/bin/c++\r\n-- Check for working CXX compiler: /private/home/tengli/miniconda3/envs/cuda9/bin/c++ -- works\r\n-- Detecting CXX compiler ABI info\r\n-- Detecting CXX compiler ABI info - done\r\n-- Detecting CXX compile features\r\n-- Detecting CXX compile features - done\r\n-- Found MPI_C: /public/apps/openmpi/2.1.1/gcc.4.8.4/lib/libmpi.so\r\n-- Found MPI_CXX: /public/apps/openmpi/2.1.1/gcc.4.8.4/lib/libmpi.so\r\n-- MPI_LIBRARIES: /public/apps/openmpi/2.1.1/gcc.4.8.4/lib/libmpi.so\r\n-- Configuring done\r\n-- Generating done\r\n-- Build files have been written to: /private/home/tengli/pieter_pytorch/pytorch/torch/lib/c10d/build\r\n```\r\n\r\nTest: \r\n```\r\nmpirun --mca oob tcp -mca btl_base_warn_component_unused 0 -mca oob_tcp_if_exclude em1 -np 4 test/ProcessGroupMPITest\r\nTest successful\r\nTest successful\r\nTest successful\r\nTest successful\r\n```\r\nTODO: adding all other operators and 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