Newsgroups: comp.parallel.pvm
From: wjiang@apollo.hp.com (Weicheng Jiang)
Subject: Re: dropped messages
Organization: Hewlett-Packard Company, Chelmsford, MA
Date: Wed, 7 Aug 1996 22:17:22 GMT
Message-ID: <DvsGKy.CMD@apollo.hp.com>

In article <32067072.1CFB@lmsc.lockheed.com>,
Pat O'Neal  <oneal@lmsc.lockheed.com> wrote:
>Has anyone else out there lost messages sent thru PVM?
>
>I'm setting up a simulation able to add and integrate new
>tasks dynamically. As you might expect, there's a flurry of
>messages sent each time a new task joins. Start up of the
>entire simulation tends to magnify this effect. Everything
>worked fine until I began increasing the number of tasks.
>Now I notice that some tasks are sending the appropriate
>messages, but the messages aren't being received at the
>other end. This effect doesn't seem to be tied to any
>specific task or computer. In fact, sometimes it seems
>to work just fine. Also, PVM isn't flaging any errors.
>
>PVM is reliable, right? So clobbered messages should
>automatically be resent. Even so, I buffered the start
>up with sleep commands to ease network traffic. No help.
>
>Any ideas?
>
>BTW I'm using mostly IRIX5 machines with PVM 3.3.11.
>
>-- 
>Pat O'Neal
>oneal@lmsc.lockheed.com

How many machines/tasks are you using? PVM is known to have problems with
a large number of hosts.

If you want to investigate how the messages got lost, turn on the trace
function with
    setenv PVMTASKDEBUG 3

--
Weicheng Jiang, Ph.D.            Chelmsford System Software Lab.
PVM Specialist                   Network Computing Division
Tel: 508-436-4613                Hewlett-Packard Company


-- 
Weicheng Jiang, Ph.D.            Chelmsford System Software Lab.
PVM Specialist                   Network Computing Division
Tel: 508-436-4613                Hewlett-Packard Company

