[ nice-Bugs-875682 ] extended for loop performance

Bugs item #875682, was opened at 2004-01-12 22:20
Message generated for change (Comment added) made by arjanb
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=112788&aid=875682&group_id=12788

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Isaac Gouy (igouy)
Assigned to: Nobody/Anonymous (nobody)
Summary: extended for loop performance

Initial Comment:
Lies, damn lies & benchmarks!

Probably I'm making an obvious mistake and comparing 
entirely different things.  These numbers seem a little 
strange. (average of 10, code attached)

19653.2ms extended for, range
12951.5ms foreach, range

83364.1ms extended for, int[]
66637.5ms foreach, int[]
11343.7ms while, int[]

22995.3ms extended for, ArrayList<int>
15753.1ms foreach, ArrayList<int>
17650.0ms while, ArrayList<int>

309.4ms empty while loop

The extended for statement is very convenient - why 
the performance penalty compared to foreach?

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>Comment By: Arjan Boeijink (arjanb)
Date: 2004-01-12 22:49

Message:
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user_id=688815

Surprising benchmarks I would say. The int array is doing 
badly because it's converted to an object array and I know 
that foreach and extended for aren't tuned yet. But I will try 
to improve the numbers for Nice a bit.

BTW I don't see an attachment with the code.

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Comment By: Isaac Gouy (igouy)
Date: 2004-01-12 22:23

Message:
Logged In: YES 
user_id=536291

Warning: this takes 30 minutes or so on P4 2GHz WinXP

java version "1.4.2_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 
1.4.2_01-b06)
Java HotSpot(TM) Client VM (build 1.4.2_01-b06, mixed mode)

Nice compiler version 0.9.6 prerelease (build 2004.01.10, 
17:42:12 UTC)

----------------------------------------------------------------------

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