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Re: Java Performance in MAC OS X

Subject: Re: Java Performance in MAC OS X
From: Bill Wagner <email@hidden>
Date: Mon, 17 Jul 2006 20:12:05 -0400
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Exclude the test results for the XP box from the equation, and exclude 1.6 because it is really "done" yet, and his test results for the iBook with the same CPU and (I assume OS X version) show the following:

Time of execution for StringBuffer test:
In the Mac with VM 1.3
 20 ms
Same execution now with VM 1.4.2_12:
 17 ms
Using VM 1.5.0_07:
 26 ms

In 1.3, we get 20ms, then in 1.4 it improves to 17ms, then in 1.5 the execution time goes up to 26ms, which means that processing time using 1.5 has degraded by slightly over 50% with respect to 1.4. If you go back to his e-mail with all the test results you show a consisitent performance improvement as the JVM versions go up with the Pentium based machine. The article, if I recall it correctly, was intended to show some of the optimization improvements on Sun releases as we go from 1.4->1.5->1.6.

It would seem to me that this indicates those performance improvements have not been implemented in 1.5, which is an official release now.

Best wishes,

Bill Wagner

Greg Guerin wrote:

Bill Wagner wrote:

This really renders any comparison between iBook and Pentium invalid, but
as you run these tests from JVM version to JVM version on the same
architecture the tests do show some problems.

Though probably not of the magnitude the raw numbers would indicate.

I can't quote the Java 6 DP release notes, because they're NDA'ed.  So all
I can say is Read The Fine Release Notes, especially with regard to the JIT
compiler on PPC.  It should provide adequate reason for 136 ms.
Alternatively, run the P4+XP test with the command-line option -Xint.

  -- GG


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References:
	>Re: Java Performance in MAC OS X (From: Greg Guerin <email@hidden>)

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