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From: "Jonas Nygren" <ehsjony@ehs.ericsson.se>
Subject: Ada versus Java - Tasking
Date: 1997/01/16
Message-ID: <01bc03ee$594dc520$829d6482@joy.ericsson.se>#1/1
X-Deja-AN: 210279024
organization: Ericsson
newsgroups: comp.lang.ada
Date: 1997-01-16T00:00:00+00:00
List-Id: <comp.lang.ada>



I have written a small producer-consumer type of program
both in Ada and Java. To my astonishment the Java code
executes faster than the Ada code.

My test starts 50 producer-consumer pairs that run in
parallell. Each pair produces/consumes 1000 messages
of 50 bytes. I get the following timing on my P133,
16M, and running Win95:

Ada  (Gnat 3.04a)  : ~30 s
Java (MS SDK-Java) : ~15 s

This result was very much to my surprise!

I have tried to check over and over and I can not find
any errors in my code. Furthermore, with Java I managed
to start 400 producer-consumer pairs but the Ada version
stopped working already when 63 pairs were started
(62 pairs would run).

What is a reasonable explanation to this result. Both
Gnat and Java run on top of Win95's threads so there must
be something else that differs. It might be that Gnat 3.04a
is a bit dated and that the implementation in Win95 isn't
so good. It could also be that Ada tasking is inherently
'heavier' than Java's and that this accounts for the
differences.

I would be interested to understand this better if you have
any idea what is happening here. 

/jonas