RE: Java performance on the i ? Good? bad? OK?

Chris,

I think the JVM *IS* buried in MI...

http://publib.boulder.ibm.com/infocenter/iseries/v5r4/topic/rzaha/jnmipe
rf.htm

Java Native Method Invocation performance considerations

Native method invocation on an iSeries(tm) server may not perform as
well as native method invocation on other platforms.

Java(tm) on the System i5(tm) has been optimized by moving the Java
virtual machine below the machine interface (MI). Native method
invocation requires a call to above MI code and may require expensive
Java Native Interface (JNI) calls back into the Java virtual machine.
Native methods should not carry out small routines, which you can easily
write in Java. Only use native methods to start system functions that
are relatively long running and are not available directly in Java.

-Eric

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Chris Bipes
Sent: Thursday, February 04, 2010 4:13 PM
To: Midrange Systems Technical Discussion
Subject: RE: Java performance on the i ? Good? bad? OK?

Any generic Virtual Machine that is ported to all possible OS' sucks.
JAVA is a brown liquid that is meant to be consumed, Not to consume all
of your computer resources.

As a employee of a privately owned company, I would not program in JAVA
for any of our systems. I try to stay away from 3rd party applications
that are written generically. Native is always better than VM.

Now if IBM integrates JAVA into the MI layer, that would be a whole new
ball game.

Chris Bipes
Director of Information Services
CrossCheck, Inc.


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Scott Klement
Sent: Thursday, February 04, 2010 1:44 PM
To: Midrange Systems Technical Discussion
Subject: Re: Java performance on the i ? Good? bad? OK?

The proper response is: "Java, in general, sucks. Here's a spatula!"


On 2/4/2010 3:25 PM, Booth Martin wrote:

Java performance on the i ? Good? Bad? OK?

I am being told that "Java on the i sucks." What is the proper

response?