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<div style="text-align: center;"><big style="font-weight: bold;"><big>實作八： MPICH 實作練習</big></big></div>
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[wiki:mpich 實作八] - [grid:raw-attachment:wiki:mpich:MPICH-1.3.ppt 課程投影片]

◢ <[wiki:YM_Course_2009/Lab7 實作七]> | <[wiki:YM_Course_2009 回課程大綱]> ▲ | <[wiki:YM_Course_2009/Lab9 實作九]> ◣

 * 使用你的帳號登入: ym**
{{{
login as: ym24
ym24@bio.classcloud.org's password: ******
ym24@bio001:~$ ssh-keygen -t rsa
}}}
 * 產生 SSH 認證金鑰
{{{
Generating public/private rsa key pair.
Enter file in which to save the key (/home/ym24/.ssh/id_rsa):  <<< 請按 Enter
Created directory '/home/ym24/.ssh'.
Enter passphrase (empty for no passphrase):            <<< 請按 Enter
Enter same passphrase again:                     <<< 請按 Enter
Your identification has been saved in /home/ym24/.ssh/id_rsa.
Your public key has been saved in /home/ym24/.ssh/id_rsa.pub.
The key fingerprint is:
2a:6c:05:f8:24:38:db:79:b9:4f:0c:74:da:c5:16:05 ym24@bio001
}}}
 * 進行金鑰交換
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ym24@bio001:~$ cp .ssh/id_rsa.pub .ssh/authorized_keys
}}}
 * 設定 MPD 設定檔跟 MPI 的執行檔路徑
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ym24@bio001:~$ echo "MPD_SECRETWORD=${user}$$" > ~/.mpd.conf
ym24@bio001:~$ chmod 600 .mpd.conf
ym24@bio001:~$ for ((i=2;i<=12;i++)); do echo "192.168.129.$i" >> mpd.hosts; done
ym24@bio001:~$ export PATH=$PATH:/opt/mpich2/bin
ym24@bio001:~$ which mpdboot
/opt/mpich2/bin/mpdboot
}}}
 * 設定 dsh (distributed shell)[http://packages.debian.org/stable/net/dsh *], 我們可以使用 dsh 指令逐台執行.
{{{
ym24@bio001:~$ mkdir -p .dsh/
ym24@bio001:~$ cp mpd.hosts .dsh/machines.list
ym24@bio001:~$ dsh -a hostname
}}}
 * 用使用者的身分執行 mpd
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ym24@bio001:~$ mpdboot -n 7
}}}
 * 用 mpdtrace 檢查 mpd 執行狀態
{{{
ym24@bio001:~$ mpdtrace 
bio002
bio006
bio012
bio011
bio005
bio004
bio003
bio010
bio009
bio008
bio007
}}}
 * 用 mpdringtest 做 mpd 訊息傳遞效能測試
{{{
ym24@bio002:~$ mpdringtest 1000
time for 1000 loops = 1.07995414734 seconds
}}}
 * 用 mpiexec 執行 cpi 範例程式
{{{
ym24@bio001:~$ mpiexec -n 3 /opt/mpich2/share/mpich2/examples/cpi
Process 0 of 1 is on bio001
pi is approximately 3.1415926544231341, Error is 0.0000000008333410
wall clock time = 0.000295
Process 0 of 1 is on bio001
pi is approximately 3.1415926544231341, Error is 0.0000000008333410
wall clock time = 0.000287
Process 0 of 1 is on bio001
pi is approximately 3.1415926544231341, Error is 0.0000000008333410
wall clock time = 0.000277
}}}
 * 貼上 test1.c
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ym24@bio001:~$ cat << EOF > test1.c
#include <stdio.h>
#include <mpi.h>
main (int argc, char **argv)
{
  int rank, size, len;
  char name[MPI_MAX_PROCESSOR_NAME];
  MPI_Init(&argc, &argv);
  int myid, numprocs;

  /* 取得 node 總數 */
  MPI_Comm_size(MPI_COMM_WORLD,&numprocs);
  /* 取得本身 node id / rank */
  MPI_Comm_rank(MPI_COMM_WORLD,&myid);
  /* 取得本身 host name */
  MPI_Get_processor_name(name, &len);
  printf("This is machine %d of %d name = %s\n", myid, numprocs, name);

  MPI_Finalize();
}
EOF
}}}
 * 用 mpicc 編譯 test1.c
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ym000@bio001:~$ mpicc -o test1 test1.c
}}}
 * 用 mpiexec 執行 test1 程式
{{{
ym000@bio001:~$ mpiexec -n 1 ./test1
This is machine 0 of 1 name = bio001
ym000@bio001:~$ mpiexec -n 12 ./test1
}}}