[Beowulf] running out of rsh ports

[Robert G. Brown]

On Wed, 3 May 2006, Clements, Brent M (SAIC) wrote:

> I second pdsh

And there is nothing wrong with the "use ssh" solution either, for most
reasonably designed parallel applications that use a remote shell to
e.g. fork off remote copies of pvmd or an application that will run for
any time long compared to the 0.1 second or so associated with ssh
startup.

There are exceptions.  Discussions of same are in the list archives,
somewhere.

    rgb

>
> Brent Clements
>
>
>
>
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> ________________________________
>
> From: beowulf-bounces at beowulf.org on behalf of Joe Landman
> Sent: Wed 5/3/2006 1:14 PM
> To: Dan Stromberg
> Cc: Kipp Cannon; beowulf at beowulf.org
> Subject: Re: [Beowulf] running out of rsh ports
>
>
>
> Dan Stromberg wrote:
>> On Wed, 2006-05-03 at 12:16 -0500, Bruce Allen wrote:
>>> rsh typically uses ports in the 513-1023 range.  With a 640 node cluster
>>> we are running out of ports.  This leads to messages such as:
>>> "rcmd: socket: All ports in use"
>>>
>>> Are there any standard solutions to this other than 'use ssh'?  We already
>>> have net.ipv4.tcp_tw_recycle = 1 in /etc/sysctl.conf
>>
>> http://dcs.nac.uci.edu/~strombrg/loop.html
>
> Hmmm.... we use pdsh for our (customers) clusters.  Works quite well.
> Your example
>
>        pdsh uname -a
>
> does the same thing if it is setup right.
>
>
> --
>
> Joseph Landman, Ph.D
> Founder and CEO
> Scalable Informatics LLC,
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-- 
Robert G. Brown	                       http://www.phy.duke.edu/~rgb/
Duke University Dept. of Physics, Box 90305
Durham, N.C. 27708-0305
Phone: 1-919-660-2567  Fax: 919-660-2525     email:rgb at phy.duke.edu