RSH scaling problems...

[Mike S Galicki]

Can't seem to get rsh to scale past like 63 nodes with mpi jobs.  SSH 
scales much higher, but the performance is a lot worse in customer 
benchmark tests.  I'm guessing that I'm running out of pty's or tty's or 
something on the headnode. Anyone have some ideas?  I believe the default 
pty's in 2.4.20 is 1024, but when I list /dev/pty I only see 256 entries. 
MAKEDEV -m 1024 didn't seem to do anything past 256.

Mike Galicki
Technical Consultant
Linux Services Team
San Francisco, CA
Internet ID: mgalicki at us.ibm.com
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