请问单机四核用mpich编译和配置

长湾

cpu为废龙9550
我想把每个核当成一个节点，
如果9550能自动分配线程就不用把把每个核模拟成节点了。
又一问题：
  mpdrun -n 4 cpi
当我扒开网线的时候，

[root@n0 examples]# n0_50534 (mpd_sockpair 226): connect -2 Name or service not known
n0_50534 (mpd_sockpair 233): connect error with -2 Name or service not known
n0_mpdman_0: mpd_uncaught_except_tb handling:
  socket.error: (111, 'Connection refused')
                  …………

我编译的时候的选项是  --with-device=ch3:nemesis，
如何默认为shared memory而不是sockets阿。

长湾

原帖由 nntp 于 2009-4-16 03:17 发表


你这个结果完全不正常的，按照这样的逻辑，全天下的HPCC都要改win算了.微软也不会在这领域这么辛苦了.

换个非并行重新编译，
Enter the number of intervals: (0 quits) 1000000000
win2003_32位的是O2，7.73秒左右
rhel_64位的是O3，12秒左右

搞了半天，原来是gcc版本低的原因，不支持 -march=amdfam10。

[ 本帖最后由 长湾 于 2009-4-20 13:20 编辑 ]

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nntp

原帖由 长湾 于 2009-4-14 17:49 发表

32位win单核下10位计算pi的时间是4秒不到（今晚不知道怎么搞得，变了7秒了，难道装了个vs8就变成这样？之前的.net是2.0，现在的是3.5，不知道有没有关系呢？），64位rhel5。3单核的时间是41秒。
虚拟 ...

你这个结果完全不正常的，按照这样的逻辑，全天下的HPCC都要改win算了.微软也不会在这领域这么辛苦了.

长湾

难道阿冈大叔用的编译器特别牛？

长湾

在win下自己编译了mpich2中的例子，单核10位数要29秒多，四核要7秒多。
安装文件自带的程序居然快了4倍。
两个程序分别单核四核执行结果一样。但单核四核的结果是不同的。

C:\Documents and Settings\Administrator>mpiexec  "C:\Program Files\MPICH2\exampl
es\cpi.exe"
Enter the number of intervals: (0 quits) 1000000000
pi is approximately 3.1415926535899708, Error is 0.0000000000001776
wall clock time = 7.718792
Enter the number of intervals: (0 quits) 1000000000
pi is approximately 3.1415926535899708, Error is 0.0000000000001776
wall clock time = 7.717777
Enter the number of intervals: (0 quits) 0

C:\Documents and Settings\Administrator>mpiexec -n 4 "C:\Program Files\MPICH2\ex
amples\cpi.exe"
Enter the number of intervals: (0 quits) 1000000000
pi is approximately 3.1415926535897682, Error is 0.0000000000000249
wall clock time = 1.967235
Enter the number of intervals: (0 quits) 1000000000
pi is approximately 3.1415926535897682, Error is 0.0000000000000249
wall clock time = 1.954080
Enter the number of intervals: (0 quits) 1000000000
pi is approximately 3.1415926535897682, Error is 0.0000000000000249
wall clock time = 1.954707

C:\Documents and Settings\Administrator>mpiexec -n 4 "C:\Program Files\MPICH2\ex
amples\Release\cpi.exe"
Enter the number of intervals: (0 quits) 1000000000

1000000000
pi is approximately 3.1415926535897682, Error is 0.0000000000000249
wall clock time = 7.417078
Enter the number of intervals: (0 quits) 0

0

C:\Documents and Settings\Administrator>mpiexec  "C:\Program Files\MPICH2\exampl
es\Release\cpi.exe"
Enter the number of intervals: (0 quits) 1000000000

1000000000
pi is approximately 3.1415926535899708, Error is 0.0000000000001776
wall clock time = 29.516858

[ 本帖最后由 长湾 于 2009-4-14 21:02 编辑 ]

长湾

而且win下多进程等待输入时cpu占用为0，而lin下居然四个核都100％，不多于4个时，openmpi有一个核的cpu占用为0，
难道是lin下的进程通讯开销特别大？

长湾

32位win单核下10位计算pi的时间是4秒不到（今晚不知道怎么搞得，变了7秒了，难道装了个vs8就变成这样？之前的.net是2.0，现在的是3.5，不知道有没有关系呢？），64位rhel5。3单核的时间是41秒。
虚拟机个32位win，跑的时间是14秒，主机rhelcpu自动降频1.1G，就算虚拟机里面的系统100％运行，也不升到2.2G。


[ 本帖最后由 长湾 于 2009-4-14 20:28 编辑 ]

长湾

[root@n0 examples]# mpiexec  -n 100 ./ring_c
[n0:05891] [[15427,0],0] ORTE_ERROR_LOG: The system limit on number of pipes a process can open was reached in file base/iof_base_setup.c at line 108
[n0:05891] [[15427,0],0] ORTE_ERROR_LOG: The system limit on number of pipes a process can open was reached in file odls_default_module.c at line 203
[n0:05891] mca_oob_tcp_accept: accept() failed: Too many open files (24).
[n0:05891] mca_oob_tcp_accept: accept() failed: Too many open files (24).
--------------------------------------------------------------------------
Sorry!  You were supposed to get help about:
    orterun:sys-limit-pipe
from the file:
    help-orterun.txt
But I couldn't find any file matching that name.  Sorry!
--------------------------------------------------------------------------
[n0:05891] mca_oob_tcp_accept: accept() failed: Too many open files (24).
[n0:05891] mca_oob_tcp_accept: accept() failed: Too many open files (24).

mark

长湾

[root@n0 ~]# mpiexec -n 100 ./cpi
[n0:04278] [[15350,0],0] ORTE_ERROR_LOG: The system limit on number of pipes a process can open was reached in file base/iof_base_setup.c at line 108
[n0:04278] [[15350,0],0] ORTE_ERROR_LOG: The system limit on number of pipes a process can open was reached in file odls_default_module.c at line 203
--------------------------------------------------------------------------
mpiexec was unable to launch the specified application as it encountered an error:

Error: system limit exceeded on number of pipes that can be open
Node: n0

when attempting to start process rank 91.

This can be resolved by either asking the system administrator for that node to
increase the system limit, or by rearranging your processes to place fewer of them
on that node.

挖坑，这个是open mpi