[mpich-discuss] Add an mpd to existing mpdring?

[Darius Buntinas]

The -h and -p parameters to mpd allow you to connect a new mpd to an
existing ring.  First use mpdtrace -l to show you the existing mpds
along with the hosts where they are running and the ports where each is
listening.  E.g., when you call mpdtrace from one of the hosts in the ring:

% mpdtrace -l
node01_58046 (XXX.XXX.XXX.XXX)

This says there is one mpd in your ring on host "node01" listening on
port 58046.  Then on the host that you want to add to the ring start a
new mpd and tell it to connect to one of the mpds already in the ring:

% mpd -h node01 -p 58046 &

If you need, you can add the --ncpus=XX option to mpd.

Now mpdtrace should show that the new host has been added.

-d


On 11/19/2008 07:53 AM, Sangamesh B wrote:
> Hello MPICH2 users,
> 
>      Is it possible to add a node(or mpd) to the already booted mpd's mpdring.
> 
> The scenario is there are 5 nodes(dual core dual processor - 20 slots
> total), in which mpd is booted on 4 nodes with mpdboot command. Now
> can I boot mpd on 5th node and add it to the existing ring, so that an
> 8 core job can be fired on 4th & 5th node.
> 
> Thanks,
> Sangamesh