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From: sharieh@bind.cs.fsu.edu (a sharieh)
Newsgroups: comp.parallel
Subject: Question: Ratio of communication to calculation time
Message-ID: <1991Apr11.190317.23509@hubcap.clemson.edu>
Date: 11 Apr 91 15:30:09 GMT
Sender: fpst@hubcap.clemson.edu (Steve Stevenson)
Reply-To: bind!sharieh@swrinde.nde.swri.edu (a sharieh)
Organization: Florida State Universiy Computer Science Department
Lines: 16
Approved: parallel@hubcap.clemson.edu


Dear thinkers,

I am running a Fortran code on the Intel iPSC/2.
If I define T_com to be the time to send a data unit of type
                  floating point from one processor to another, and
            T_stu to be the time to start up a message( sending a message of
                  length 0), and 
            T_cal to be the time to do one floating point operations such as
                  a=b*c or a=b+c,
then what are the values of the following ratios:
            T_com/T_cal, T_stu/T_cal?

Thank you in advance.
                             
A. Sharieh
 

-- 
=========================== MODERATOR ==============================
Steve Stevenson                            {steve,fpst}@hubcap.clemson.edu
Department of Computer Science,            comp.parallel
Clemson University, Clemson, SC 29634-1906 (803)656-5880.mabell