Test performance: Java 1.5 vs. 1.4

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3 total messages Started by Petar Popara Wed, 05 Oct 2005 13:24

#308

Author: Petar Popara
Date: Wed, 05 Oct 2005 13:24

3 lines
1070 bytes

Is there any public and indepenent test of performance between 1.4.x and 
1.5? My tests shows that 1.4 is much faster.

Re: Test performance: Java 1.5 vs. 1.4

#309

Author: Shankar Unni
Date: Wed, 05 Oct 2005 18:41

10 lines
1529 bytes

Petar Popara wrote:
> Is there any public and indepenent test of performance between 1.4.x and 
> 1.5? My tests shows that 1.4 is much faster. 

There's no one "speed of 1.5" vs "speed of 1.4". Many things have been 
sped up. Other things have also changed. Depending on your application's 
exact usage patterns, certain things may have sped up, and certain 
things may have slowed down, with (in your case) a net negative effect.

Exactly what "tests" did you run, anyway?

Re: Test performance: Java 1.5 vs. 1.4

#313

Author: Shankar Unni
Date: Fri, 07 Oct 2005 19:12

11 lines
1683 bytes

Shankar Unni wrote:

> There's no one "speed of 1.5" vs "speed of 1.4". Many things have been 
> sped up. Other things have also changed. Depending on your application's 
> exact usage patterns, certain things may have sped up, and certain 
> things may have slowed down, with (in your case) a net negative effect.

PS There's one open issue I saw on the JDC regarding the performance of 
String.toLowerCase(), which now (in 1.5) does an unnecessary 
String.intern() which is quite expensive. Apparently certain (e.g. 
Spring Framework based) apps have been affected quite seriously.

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