Newsgroups: comp.parallel
From: pvm@hp720.dibe.unige.it ()
Subject: PVM vs NETWORK HELP!!!
Organization: Univ. of Genoa, Italy
Date: Tue, 21 Feb 1995 17:44:32 GMT
Message-ID: <3i2eqt$p22@alpha.cisi.unige.it>

HI
I need to send 1500x1500 (and over) matrix of double between 
a RISC6000 (with 64 Mbyte RAM) and a POWER25 (with 16 Mbyte RAM).
These machines are interconnected by a ETHERNET network (with rate above 
10 Mbit/sec). Note also that I use PVM version 3.3.6 and PvmDirectRoute 
and PvmDataInPlace options. The problem is that 
net rate get lower when I do more than one trasmission.
At first transmission the net works at 8.9 Mbit/sec (OK) but
at following pvm_send the net rate decrease down to 0.7 Mbit/sec
(I free RAM with free() and send/receive buffer with pvm_freebuf()
at every iteration).
I have the sospect that there is some resource that go to saturation.
It is correct? What is this resource?
Is it a PVM bug? Is it a machine (IBM) bug? What is the solution?

THANKS TO EVERYBODY
	Marco


