Which mpd mpich2

Under ubuntu feisty: sudo apt-get install build-essential. You need a shared directory for all nodes. In the following steps it is assumed that the home directory is shared. This path must be added to the linking search path of FPC. There are two common possibilities:.

It should contain one line:. If your home is not shared, it must be copied to all cluster nodes. Check that you can login via ssh without password to all cluster nodes:. Bring up the ring:. If the current machine is not part of the cluster not in the mpd.

The number of proccess here: 5 can exceed the number of hosts. The distribution of user processes is according to the granted slot allocation. The two other processes can be found on the other node:. The important thing is, that the started script including the mpiexec and the program mpihello are under full SGE control. If we start the daemons on our own, we have to select a free port. Although it maybe not safe in all cluster setups, the included formula in startmpich2.

According to the MPICH2 team, this will not have any speed impact because the level of debugging is set to 0 , but only prevent the daemons from forking. Having this setup in a proper way, we can submit the demonstration job:. The forked-off qrsh-commands by the startmpich2. Important is, that the working tasks of the mpihello are bound to the process chain, so that the accounting will be correct, and also a controlled shutdown of the daemons is possible.

If all is running fine, you may comment out these lines to shorten the output a little bit and avoid any confusion to the user. This will prevent a proper shutdown, although this environment variable is already set during the start and stop of the daemons in the appropriate scripts of the PE. The cluster consists of four compute nodes and a head node. To use the cluster log onto the head node and launch jobs to run on the compute nodes.

Assuming you follow the above generic instructions you should be fine. Here are some specifics on how things should be done for this cluster. For the mpd. The 8 means that they have 8 cores each and the first 8 jobs will go to the first host list, the second 8 to the next host and so on.

Since there are four compute nodes with eight cores each the argument to the -n option to mpiexec should not exceed 32 and be sure to run with the -1 option so jobs will not run on the head node.