From: Isaac Gouy <igouy@...>
Date: 2006-08-05T12:00:16+09:00
Subject: Re: For performance, fix the Java program


Jon Harrop wrote:
-snip-
> These languages are not the same. However, using "ordinary" IO via
> System.out.println or cout or print_endline is the "vanilla" way of
> outputting in all of these languages. Of these languages, only Java gives
> appalling performance unless you switch to buffers.

I guess you'd fail a Java exam :-)

(I'm not interested enough to find out, but I suspect stdout is at
minimum line-buffered.)


> Even when you do use buffers in Java, it is still slower than unbuffered
> C++, OCaml etc. on my machine.

No where near an order of magnitude slower - iirc you reported 1.85x C


> I was using Sun's J2SE 1.5. I also tried GNU's GIJ, which is even slower
> than OCaml's bytecode.

You failed the Java exam again :-)
For Java without JIT use the -Xint command line option with the Sun JVM
like this

   time java -Xint Latin > /dev/null


And if the program ran for any amount of time we of course be using

   time java -server Latin > /dev/null