[mpich-discuss] importance of /tmp/mpd2.console_root?

[Sangamesh B]

Hi,

  In my case, the mpd was not running. mpdboot was giving problem with
mpd2.console_root file on that particular node.
Tried to delete it. But it couldn't.

You r telling it will delete??

  Rebooted that node. The strange thing happened is the node failed to boot
and stuck at GRUB prompt.

 Then we reinstalled it. I'm not sure what is the exact cause for this.

Thanks,
Sangamesh
On Sat, Oct 4, 2008 at 8:16 AM, Rajeev Thakur <thakur at mcs.anl.gov> wrote:

>
> From: Ralph Butler
> Sent: Friday, October 03, 2008 5:43 PM
> Subject: Re: [mpich-discuss] importance of /tmp/mpd2.console_root?
>
> A file in /tmp named mpd2.console_XXXX is a Unix socket.  It is used by
> mpiexec (and other pgms) to connect to mpd.  Typically XXXX is the name of
> a
> particular user who started the mpd and the socket can only be connected to
> by that user.  However, if XXXX is root, and mpd was installed correctly,
> then other users may connect to the socket and run jobs.  The socket should
> be removed when the mpd exits gracefully, e.g. via mpdallexit.  However, it
> may be left when an mpd fails.  But an old file should be removed when a
> new
> mpd starts.
>
>
> ________________________________
>
>        From: owner-mpich-discuss at mcs.anl.gov
> [mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Sangamesh B
>        Sent: Friday, October 03, 2008 1:22 AM
>        To: MPICH ML
>        Subject: [mpich-discuss] importance of /tmp/mpd2.console_root?
>
>
>        Hi all,
>
>             I want to know the importance of "mpd2.console_root" file.
>
>             This file gets created after launching the mpd's in /tmp
> directory.
>
>        srwxrwxrwx 1 root   root      0 Oct  3 11:21 mpd2.console_root
>
>             When mpd's are stopped, this file get deleted automatically.
>
>        I'm curious to know about this because, recently I faced a problem
> with mpdboot. mpdboot was not happening and gave error with a particular
> node. I googled the error, then I came to know that its problem with the
> above file.
>
>        Eventhough, there was no mpd(as user root) running on that node, the
> file /tmp/mpd2.console_root was present. I tried to delete. But it couldn't
> delete.
>
>        So why this file is required? In the above case what's the wayout?
>
>        Thanks,
>        Sangamesh
>
>
>
>
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