Newsgroups: comp.parallel.mpi
From: rcs@parcom.ernet.in (Ramesh Chandrashekar)
Subject: MPI fails after 27 nodes
Organization: Centre for Development of Advanced Computing (C-DAC), Pune, INDIA.
Date: Thu, 2 Nov 1995 09:06:08 GMT
Message-ID: <DHEryB.F04@parcom.ernet.in>

We have MPI v.1.1.10 running on a cluster of SunSparcWorkstations, 24 of them
running SOLARIS 2.3, and 8 of them running SOLARIS 2.4
These are connected with a hi-speed propietary network, and 28 of these are
diskless clients (Each server serves 7 diskless clients).
I am able to run parallel (MPI) applications on this configuration upto 27 nodes
(Any 27). However, for more than 27, I get an error

	accept: Too many open files

which seems to be a socket-accept prob. Even if I increase the max. value
of descriptors in the env. to 1048 (from 64), there is no change.
Is there any change to be made in the MPI or p4 sources to allow me to increase
the max. no of connections. I couldn't find any doc. on this, nor any help

Ramesh



--

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Living on Earth may be expensive, but it includes an annual free trip
    around the Sun.

			Ramesh Chandrasekhar
			CDAC, Pune Univ. Campus,
			Ganeshkhind, Pune - 411 007.
			INDIA.

		email: rcs@parcom.ernet.in, rcs@seismic.parcom.ernet.in

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

