I think this question has to be granular enough to cover which JVM's are
in place as well as what hardware platform. We have used Java for well
over 10 years on the platform. In the pre-POWER4 days (classic 64bit
JVM) the performance was adequate with a few problematic areas. When
comparing to WINTEL in a single user or small users scenario there was
some major differences. As the number of users increased the
performance curve on the i changed very little. Eventually, the system
could prove itself.
As we moved up the POWER curve (POWER5, POWER5+, POWER6) the low end
performance differences became less and less. I think POWER6 is a huge
equalizer.
Having said that I also think that the J9 JVM is a huge differentiator.
Much as I bought into the 'architecture' of the classic JVM I firmly
believe that J9 is the way to go. Not only for performance but for
consistency within IBM products.
Generally speaking I believe that J9 and POWER6 can in most cases answer
that question with YES.
Michael Crump
Manager, Computing Services
SGCI
1509 S. Macedonia Ave.
Muncie, IN 47302
765.741.7696
765.741.7012 f
Elitism
It's lonely at the top. But it's comforting to look down upon everyone
at the bottom.
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-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Joe Pluta
Sent: Monday, February 08, 2010 5:09 PM
To: Midrange Systems Technical Discussion
Subject: Re: Java performance on the i ? Good? bad? OK?
Scott Klement wrote:
But... performance is just not one of it's advantages.
Had you said anything like that, or even simply "RPG performs better",
then I doubt anyone would have taken you to task for it. The truth is
that Java performs perfectly well for plenty of things, especially when
paired with RPG for database access. With database access, it's not
Java that really underperforms, it's the SQL-based data access that
demands immense overhead to do simple fetches.
In any case, the issue is not simply which performs best. We all know
RPG is the winner hands down; I've done plenty of benchmarks on that
over the years.
No, the real issue is :is it fast enough, and it is for so many things,
especially web application serving. And more important, it is fast to
market, making it so that you don't have to reinvent the wheel on so
many things.
Okay, 'nuff said. The phrase "Java, in general, sucks" was a poor
choice of words. I've made plenty of those in my day. Moving on now...
Joe
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