Greetings! Jose Marin <[EMAIL PROTECTED]> writes:
> On Fri, 3 Mar 2000, Mark Brown wrote: > > > MPICH is hard-coded to use /usr/bin/rsh, although it is not particularly > > concerned about what's there and could probably be modified relatively > > easily. It's certainly trivial to do at compile time. As far as I > > remember, the upstream authors take the view that the performance of ssh > > is such that you probably don't want to use it in HPC applications. > > But isn't it the case that the ssh connection is only used to execute > shell commands, and that once they're started the mpi binaries do all > their communications independently of the rsh/ssh connection? (i.e. no > encryption on the SEND(), RECV(), etc.) > > In other words, one may see a slower start-up of the application, but once > it's running you shouldn't see any difference (unless you do a lot of i/o > to stdout, but why would you?) > I think you're right here, judging from the netstat port numbers pertaining to my running Beowulf process. But, as you note, there is a difference at startup, possibly also with standard output. Take care, > Jose > -- > Jose L Marin [EMAIL PROTECTED] > Dept of Mathematics [EMAIL PROTECTED] > Heriot-Watt University > Edinburgh EH14 4AS, U.K. > Phone: +44 131 451 3893 > Fax: +44 131 451 3249 > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] -- Camm Maguire [EMAIL PROTECTED] ========================================================================== "The earth is but one country, and mankind its citizens." -- Baha'u'llah
