如何在mpi中运行c代码：无法连接到本地mpd（/tmp/mpd2.console\u karim）；可能的原因？

无法在使用ubuntu的终端上运行用c编写的mpi代码

karim@karim:~/Desktop/greetings$ mpicc main.c -o test
karim@karim:~/Desktop/greetings$ mpirun -np 3 test
mpiexec_karim: cannot connect to local mpd (/tmp/mpd2.console_karim); possible causes:
  1. no mpd is running on this host
  2. an mpd is running but was started without a "console" (-n option)
In case 1, you can start an mpd on this host with:
    mpd &

and you will be able to run jobs just on this host.
For more details on starting mpds on a set of hosts, see
the MPICH2 Installation Guide.

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搜索之后，我用这个代码解决了这个问题

mpd --ncpus=2 &
mpirun -np 2 --host localhost ./try.exe

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搜索之后，我用这个代码解决了这个问题

mpd --ncpus=2 &
mpirun -np 2 --host localhost ./try.exe

mpd --ncpus=2 &
mpirun -np 2 --host localhost ./try.exe