On Wed, May 03, 2006 at 02:14:31PM -0400, Joe Landman wrote: > 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.
Except that it probably won't help with the problem, which I'm guessing is caused by a given host attempting more than 1024 RSH connections to a given server in less than TCP TIME WAIT seconds (minutes, whatever). If the original correspondent doesn't want to use SSH for RSH, which would fix things SSH isn't restricted to low-numbered ports, he could try to re-implement his application in MPI. DS > > > -- > > Joseph Landman, Ph.D > Founder and CEO > Scalable Informatics LLC, > email: [EMAIL PROTECTED] > web : http://www.scalableinformatics.com > phone: +1 734 786 8423 > fax : +1 734 786 8452 or +1 866 888 3112 > cell : +1 734 612 4615 > > _______________________________________________ > Beowulf mailing list, [email protected] > To change your subscription (digest mode or unsubscribe) visit > http://www.beowulf.org/mailman/listinfo/beowulf > _______________________________________________ Beowulf mailing list, [email protected] To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
