User Manual

Rev 2.0-3.0.0
Mellanox Technologies
101
These MPI implementations, along with MPI benchmark tests such as OSU BW/LAT, Intel MPI
Benchmark, and Presta, are installed on your machine as part of the Mellanox OFED for Linux
installation. Table 7 lists some useful MPI links.
This chapter includes the following sections:
• Section 5.2.2,“Prerequisites for Running MPI,” on page 99
• Section 5.2.3,“MPI Selector - Which MPI Runs,” on page 100
• Section 5.2.4,“Compiling MPI Applications,” on page 100
5.2.2 Prerequisites for Running MPI
For launching multiple MPI processes on multiple remote machines, the MPI standard provides a
launcher program that requires automatic login (i.e., password-less) onto the remote machines.
SSH (Secure Shell) is both a computer program and a network protocol that can be used for log-
ging and running commands on remote computers and/or servers.
5.2.2.1 SSH Configuration
The following steps describe how to configure password-less access over SSH:
Step 1. Generate an ssh key on the initiator machine (host1).
Step 2. Check that the public and private keys have been generated.
Table 7 - Useful MPI Links
MPI Standard
http://www-unix.mcs.anl.gov/mpi
Open MPI
http://www.open-mpi.org
MVAPICH 2 MPI
http://mvapich.cse.ohio-state.edu/
MPI Forum
http://www.mpi-forum.org
host1$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/<username>/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/<username>/.ssh/id_rsa.
Your public key has been saved in /home/<username>/.ssh/id_rsa.pub.
The key fingerprint is:
38:1b:29:df:4f:08:00:4a:0e:50:0f:05:44:e7:9f:05 <username>@host1
host1$ cd /home/<username>/.ssh/
host1$ ls
host1$ ls -la
total 40
drwx------ 2 root root 4096 Mar 5 04:57 .
drwxr-x--- 13 root root 4096 Mar 4 18:27 ..
-rw------- 1 root root 1675 Mar 5 04:57 id_rsa