13. LAM/MPI

13.1. Resources

• www.lam-mpi.org
  • User Guide (PDF)
  • Installation Guide (PDF)
  • Downloads
  
  
• Some Good Examples from Boston University (scroll down to the section called Basic MPI Routines Through Examples).
  
  
• User's Guide for MPI can be found in several places, in Postscript form, including from the appropriate link from here --- "here" is a page advertising the author's book, an expanded version of the free article.

13.2. Download, Configuration and Installation

Downloaded the source code from from the above link (lam-7.0.tar.gz), scanned the installation doc (see above link), exported some things...

    export CC=/usr/bin/gcc
    export CXX=/usr/bin/g++
    export FC=/usr/bin/g77

    ./configure --prefix=/usr/local/lam-7.0 --with-rsh="ssh"
    make
    make install

13.3. Copying to Other Nodes

Use SCP to copy /usr/local/lam-7.0 and /home/simonh/lam-7.0 to all nodes.

13.4. System Configuration

The LAM stuff is run as simonh, so ensure its all in the user's path by adding export PATH=$PATH=/usr/local/lam-7.0/bin to ~/.bashrc on all nodes.

Edit a file called, say lamboot.nodes on the "master" machine (in our case 130.88.149.97) with the IP addresses of the nodes:

    130.88.149.97
    130.88.149.98
    130.88.149.99
    130.88.149.100
    130.88.149.101
    130.88.149.102

Ensure user simonh can authenticate from master to all nodes via SSH without passwords (use public keys, a la above).

13.5. Stopping and Starting

Start the LAM daemon (lamd) on all nodes:

    lamboot -v -ssi boot rsh lamboot.nodes 

13.6. Testing --- The Examples

Start the daemon on all the machines. Then run an example or two:

    mpirun N /home/simonh/lam-7.0/examples/alltoall/alltoall

13.7. Formal Testing

Start the daemon on all the machines. Download the tests, lamtests-7.0.tar.gz from the download page (see link above), then

    ./configure
    make -k check MODES="tcp"    

13.8. Issues Raised

Need all machines to mount same disk-space for users who will use this. Probably could have eUMIST usernames LDAP-authenticated and mounting Cosmos/Eric space on all machines.