Newsgroups: comp.parallel.pvm
From: paulja@cs.kun.nl (Paul Janssen)
Subject: Q: how to interpret "host_sync" trace events
Summary: how to interpret "host_sync" trace events ?
Keywords: trace XPVM PVM
Organization: University of Nijmegen, The Netherlands
Date: Mon, 20 Jun 1994 10:42:49 GMT
Message-ID: <Croz3F.J41@sci.kun.nl>

Hi,

	I'am writing a gawk script's to detect tachyons (messages received
before they are send) and to compute some overall statistics (per process,
per message type). Thanks to the comments in the tracefiles generated by 
PVM 3.3.0,
I've come up with something quit fast. But ....

I don't know how to interpret the "host_sync" trace events.
I've thought of the following options:

1.	The delta time is already added to the time stamps following the
	last "host_sync" trace event. This would mean I could simply ignore
	"host_sync" trace events.

2. 	The delta time has to be added to the time stamps following the
	last "host_sync". This, however raises a second question:
	(2a)The "Host Clock Synchronization Delta Seconds" seams to be signed,
	and I suspect that the "Host Clock Synchronization Delta Microseconds"
	is unsigned. This would mean that the total delta time would be
	total delta = delta sec + (delta usec / 1000000). Am I right or
	Am I wrong ?
	(2b) I was wrong. Then wat is the correct formula?

Can anybody please answer the above questions, thanks in advance .....

Paul Janssen, graduate at Nijmegen University
Email: paulja@sci.kun.nl
 

