<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><div dir="ltr"><div>I cannot reproduce this. I am using Darwin 15.5.0 instead of 15.6.0, but the compiler is identical. I am using MPICH Git master from June 29.</div><div><br></div><div>At this point, it is unclear to me if the bug is in MPICH or Clang.</div><div><br></div><div>Jeff</div><div><br></div>
<p class=""><span class="">vsanthan-mobl1:BUGS jrhammon$</span><span class=""> /opt/mpich/dev/clang/default/bin/mpichversion </span></p>
<p class=""><span class="">MPICH Version: <span class=""> </span>3.2</span></p>
<p class=""><span class="">MPICH Release date:<span class=""> </span>unreleased development copy</span></p>
<p class=""><span class="">MPICH Device: <span class=""> </span>ch3:nemesis</span></p>
<p class=""><span class="">MPICH configure: <span class=""> </span>CC=clang CXX=clang++ FC=false F77=false --enable-cxx --disable-fortran --with-pm=hydra --prefix=/opt/mpich/dev/clang/default --enable-cxx --enable-wrapper-rpath --disable-static --enable-shared</span></p>
<p class=""><span class="">MPICH CC: <span class=""> </span>clang -O2</span></p>
<p class=""><span class="">MPICH CXX: <span class=""> </span>clang++ -O2</span></p>
<p class=""><span class="">MPICH F77: <span class=""> </span>false </span></p>
<p class=""><span class="">MPICH FC: <span class=""> </span>false </span></p>
<p class=""><span class="">vsanthan-mobl1:BUGS jrhammon$</span><span class=""> /opt/mpich/dev/clang/default/bin/mpicc -v</span></p>
<p class=""><span class="">mpicc for MPICH version 3.2</span></p>
<p class=""><span class="">Apple LLVM version 7.3.0 (clang-703.0.31)</span></p>
<p class=""><span class="">Target: x86_64-apple-darwin15.5.0</span></p>
<p class=""><span class="">Thread model: posix</span></p>
<p class=""><span class="">InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin</span></p>
<p class=""><span class="">clang: warning: argument unused during compilation: '-I /opt/mpich/dev/clang/default/include'</span></p><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jul 26, 2016 at 8:17 AM, Andreas Noack <span dir="ltr"><<a href="mailto:andreasnoackjensen@gmail.com" target="_blank">andreasnoackjensen@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><div style="font-size:12.8px">On my El Capitan macbook I get a segfault when running the program below with more than a single process but only when MPICH has been compiled with Clang.</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">I don't get that good debug info but here is some of what I got</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px"><div>(lldb) c</div><div>Process 61129 resuming</div><div>Process 61129 stopped</div><div>* thread #1: tid = 0x32c438, 0x00000003119d0432 libpmpi.12.dylib`MPID_Request_create + 244, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT)</div><div> frame #0: 0x00000003119d0432 libpmpi.12.dylib`MPID_Request_create + 244</div><div>libpmpi.12.dylib`MPID_Request_create:</div><div>-> 0x3119d0432 <+244>: movaps %xmm0, 0x230(%rax)</div><div> 0x3119d0439 <+251>: movq $0x0, 0x240(%rax)</div><div> 0x3119d0444 <+262>: movl %ecx, 0x210(%rax)</div><div> 0x3119d044a <+268>: popq %rbp</div></div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">My version of Clang is</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px"><div>Apple LLVM version 7.3.0 (clang-703.0.31)</div><div>Target: x86_64-apple-darwin15.6.0</div><div>Thread model: posix</div><div>InstalledDir: /Library/Developer/CommandLineTools/usr/bin</div></div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">and the bug has been confirmed by my colleague who is running Linux and compiling with Clang 3.8. The program runs fine with OpenMPI+Clang.</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px"><div>#include <mpi.h></div><div>#include <stdio.h></div><div>#include <stdlib.h></div><div><br></div><div>int main(int argc, char *argv[])</div><div>{</div><div> MPI_Init(&argc, &argv);</div><div><br></div><div> MPI_Comm comm = MPI_COMM_WORLD;</div><div> uint64_t *A, *C;</div><div> int rnk;</div><div><br></div><div> MPI_Comm_rank(comm, &rnk);</div><div> A = calloc(1, sizeof(uint64_t));</div><div> C = calloc(2, sizeof(uint64_t));</div><div> A[0] = rnk + 1;</div><div><br></div><div> MPI_Allgather(A, 1, MPI_UINT64_T, C, 1, MPI_UINT64_T, comm);</div><div><br></div><div> MPI_Finalize();</div><div> return 0;</div><div>}</div><div><br></div><div><br><span style="font-size:small">Best regards</span><span class=""><font color="#888888"><div style="font-size:small"><br></div><div style="font-size:small">Andreas Noack</div><div style="font-size:small">Postdoctoral Associate</div><div style="font-size:small">Computer Science and Artificial Intelligence Laboratory</div><div style="font-size:small">Massachusetts Institute of Technology</div></font></span></div></div></div></div>
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