搭建mpi并行运算中遇到的问题与解决方案

搭建mpi并行运算中遇到的问题与解决方案

1，[root@localhost ~]# mpdtrace

configuration file /etc/mpd.conf is accessible by others

change permissions to allow read and write access only by you

解决：

[root@localhost ~]# chmod 600 /etc/mpd.conf

2，[root@localhost ~]# mpdboot -n 1 -f mpd.hosts

mpdboot_localhost.localdomain (handle_mpd_output 414): from mpd on localhost.localdomain, invalid port info:

no_port

解决：

是因为 mpd.conf 等文件权限问题造成的，需要设置为 600权限

3，[root@localhost ~]# mpdtrace

mpdroot: perror msg: No such file or directory

mpdroot: cannot connect to local mpd at: /tmp/mpd2.console_root

probable cause: no mpd daemon on this machine

possible cause: unix socket /tmp/mpd2.console_root has been removed

mpdtrace (__init__ 1204): forked process failed; status=255

解决：

mpdboot服务没有起来，mpdboot -n 1 -f mpd.hosts

4，在测试过程中，经常出现mpd进程无法与某个节点建立连接或者无法通信的问题，出现这种问题一是要检查该节点单独启动mpd是否成功，如果成功，则问题一般出现在防火墙的配置上

5，[root@localhost examples]# mpiexec -n 5 ./cpi

mpiexec_localhost.localdomain (mpiexec 392): no msg recvd from mpd when expecting ack of request

[root@localhost examples]# mpiexec -n 5 ./cpi

Process 3 of 5 is on localhost.localdomain

Process 4 of 5 is on localhost.localdomain

Process 0 of 5 is on localhost.localdomain

Process 1 of 5 is on localhost.localdomain

Process 2 of 5 is on localhost.localdomain

pi is approximately 3.1415926544231230, Error is 0.0000000008333298

wall clock time = 0.005338

[root@localhost examples]#

解决：可能是资源忙之类的，有的时候正常有的时候异常