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我有我的程序减少到下面的例子分段错误:为什么MPI_Barrier导致C++
#include <mpi.h>
int main(int argc, char * argv[]) {
int rank, size;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Barrier(MPI_COMM_WORLD);
MPI_Finalize();
return 0;
}
我编译和运行代码,并得到以下结果:
My-MacBook-Pro-2:xCode_TrapSim user$ mpicxx -g -O0 -Wall barrierTest.cpp -o barrierTestExec
My-MacBook-Pro-2:xCode_TrapSim user$ mpiexec -n 2 ./barrierTestExec
================================================================================== =
= BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
= PID 21633 RUNNING AT My-MacBook-Pro-2.local
= EXIT CODE: 11
= CLEANING UP REMAINING PROCESSES
= YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
===================================================================================
YOUR APPLICATION TERMINATED WITH THE EXIT STRING: Segmentation fault: 11 (signal 11)
This typically refers to a problem with your application.
Please see the FAQ page for debugging suggestions
如果我注释掉了MPI_Barrier,或者只在一个节点上运行程序,代码运行良好。我使用了以下编译:
My-MacBook-Pro-2:xCode_TrapSim user$ mpiexec --version
HYDRA build details:
Version: 3.2
Release Date: Wed Nov 11 22:06:48 CST 2015
CC: clang
CXX: clang++
F77: /usr/local/bin/gfortran
F90: /usr/local/bin/gfortran
Configure options: '--disable-option-checking' '--prefix=/usr/local/Cellar/mpich/3.2_1' '--disable-dependency-tracking' '--disable-silent-rules' '--mandir=/usr/local/Cellar/mpich/3.2_1/share/man' 'CC=clang' 'CXX=clang++' 'FC=/usr/local/bin/gfortran' 'F77=/usr/local/bin/gfortran' '--cache-file=/dev/null' '--srcdir=.' 'CFLAGS= -O2' 'LDFLAGS=' 'LIBS=-lpthread ' 'CPPFLAGS= -I/private/tmp/mpich-20160606-48824-1qsaqn8/mpich-3.2/src/mpl/include -I/private/tmp/mpich-20160606-48824-1qsaqn8/mpich-3.2/src/mpl/include -I/private/tmp/mpich-20160606-48824-1qsaqn8/mpich-3.2/src/openpa/src -I/private/tmp/mpich-20160606-48824-1qsaqn8/mpich-3.2/src/openpa/src -D_REENTRANT -I/private/tmp/mpich-20160606-48824-1qsaqn8/mpich-3.2/src/mpi/romio/include'
Process Manager: pmi
Launchers available: ssh rsh fork slurm ll lsf sge manual persist
Topology libraries available: hwloc
Resource management kernels available: user slurm ll lsf sge pbs cobalt
Checkpointing libraries available:
Demux engines available: poll select
My-MacBook-Pro-2:xCode_TrapSim user$ clang --version
Apple LLVM version 7.3.0 (clang-703.0.31)
Target: x86_64-apple-darwin15.5.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
这似乎是它应该是一个很重要的问题,但我似乎无法弄清楚。为什么MPI_Barrier会导致这个简单的代码发生故障?
我无法复制。您的代码在这里运行时不会崩溃。 – amaurea
我并不感到惊讶,这是MPI的一个简单的例子,但是无论我有什么编译器组合或什么都不合作。我只是希望有人可能以前见过这个。 – jboss
欢迎来到SO。虽然你的问题被问及,但仍难以重现,从而理解你的问题。可能的答案是*您的MPI安装有问题*,但这不是太有用。你可以添加一些关于你如何安装MPI的细节?最终向包提供商提供的错误报告(假设它来自存储库)可能会更有前途。 – Zulan