Message from discussion
Optimise my ray tracer
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Message-ID: <42aad330$0$2038$ed2e19e4@ptn-nntp-reader04.plus.net>
From: Jon Harrop <use...@jdh30.plus.com>
Subject: Re: Optimise my ray tracer
Newsgroups: comp.lang.java.programmer
Date: Sat, 11 Jun 2005 13:03:02 +0100
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Organization: Flying Frog Consultancy Ltd.
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Tor Iver Wilhelmsen wrote:
> Jon Harrop <use...@jdh30.plus.com> writes:
>> Can you elaborate on this? All of my tests indicate that Java is many
>> times slower than most other modern languages, even stereotypically slow
>> languages like SML and OCaml.
>
> Since Java code (unless forced to run interpreted) runs 98% of its
> time as run-time optimized native code, how can it be slower than
> compile-time optimized C code?
Many possible reasons:
1. Java's optimiser isn't as good.
2. The time spent optimising is longer than the time saved executing.
3. Deficiencies in the language (of which there are many in Java, e.g.
run-time checks due to OO, boxing).
4. Poor implementations of performance critical constructs by the compiler,
e.g. recursion.
> Are you perchance taking startup time into consideration?
I have taken startup time into consideration. Java is still consistently
many times slower than most other languages.
--
Dr Jon D Harrop, Flying Frog Consultancy
http://www.ffconsultancy.com
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