Jikes and NetRexx

[Mike Cowlishaw-2]

Jikes had a couple of problems with NetRexx files: first it didn't
handle a line of the form /* .. *//* .. */ (as generated by NetRexx
if -format is not specified) and second it didn't handle names with
a '$' in them.

Both of these have been fixed; the first was a simple bug; the latter
trickier -- I believe that you need to specify a '-$' option to make
this work.  If you don't like that, I'm sure they'd appreciate your
feedback.

On HPJ -- I'm told that it gives a very useful speedup when running
NetRexxC.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Mike Cowlishaw, IBM Fellow, IBM UK Laboratories
mailto:[hidden email]   [http://www2.hursley.ibm.com]
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[Dr Tony Dahlman]

Let's see, without JIT compiler Java runs 20+ times slower than
native.

With JIT it runs 3-5 times slower, or so.

With Jikes are we there, or nearly so?

And someday could we get a JIT implemented in hardware, for
example something to plug into one of those USB ports?

- Tony Dahlman

BTW please accept apologies for my previous multiple post to
this group.  


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[mcbrides]

>Jikes had a couple of problems with NetRexx files: first it didn't
>handle a line of the form /* .. *//* .. */ (as generated by NetRexx
>if -format is not specified) and second it didn't handle names with
>a '$' in them.
>
>Both of these have been fixed; the first was a simple bug; the latter
>trickier -- I believe that you need to specify a '-$' option to make
>this work.  If you don't like that, I'm sure they'd appreciate your
>feedback.
>

I'll go track down a copy of Jikes. Thanks for the info, Mike.

>On HPJ -- I'm told that it gives a very useful speedup when running
>NetRexxC.
>

The speed enhancements are quite noticable. However, if it a fast OS/2 native
app that I want, I'd have written it in a different language. Java via NetRexx
has the BIG advantage of running on EVERYTHING that has a JVM...

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[mcbrides]

>Let's see, without JIT compiler Java runs 20+ times slower than
>native.
>
>With JIT it runs 3-5 times slower, or so.
>

Some of the apps that I work with run almost on par with native code... The
March 4th update really speeds things along...

>With Jikes are we there, or nearly so?
>

Well, Jikes is a Java Code to Java Class compiler, it has nothing to do with
running performance...

>And someday could we get a JIT implemented in hardware, for
>example something to plug into one of those USB ports?
>

Now that IBM has licensed the JavaChip technology from Sun, I'd say it's very
possible that you'll see it turn up somewhere. On a PC card ( ala' JAVABLASTER)
I don't know, but I'd buy a dozen... no questions asked...

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| Jerry McBride                       |
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