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From robert engels <reng...@ix.netcom.com>
Subject Re: [jira] Created: (LUCENE-1257) Port to Java5
Date Wed, 09 Apr 2008 00:44:10 GMT
The test intentionally creates very little garbage, just in the  
System.out I would assume.

I am running on a Mac, so of course it will be faster :)



On Apr 8, 2008, at 7:21 PM, Yonik Seeley wrote:

> On Tue, Apr 8, 2008 at 7:48 PM, robert engels  
> <rengels@ix.netcom.com> wrote:
>> That is opposite of my testing:...
>>
>>  The 'foreach' is consistently faster.
>
> It's consistently slower for me (I tested java5 and java6 both with
> -server on a P4).
> I'm a big fan of testing different methods in different test runs
> (because of hotspot, gc, etc).
>
> Example results:
> $ c:/opt/jdk16/bin/java -server t 100000000 10 foreach
> N = 10
> method=foreachlen=1000000000 indexed time = 8734
>
> Yonik@spidey /cygdrive/h/tmp
> $ c:/opt/jdk16/bin/java -server t 100000000 10 iter
> N = 10
> method=iterlen=1000000000 indexed time = 7062
>
>
> Here's my test code (a modified version of yours):
>
> public class t {
>    public static void main(String[] args) {
>        int I = Integer.parseInt(args[0]); // 1000000
>        int N = Integer.parseInt(args[1]); // 10
>        String method = args[2].intern();  // foreach or iter
>
>        String[] strings = new String[N];
>
>        for (int i = 0; i < N; i++) {
>            strings[i] = Integer.toString(i);
>        }
>
>        System.out.println("N = " + N);
>
>        long len = 0;
>        long start = System.currentTimeMillis();
>
>        if (method=="foreach")
>          for (int i = 0; i < I; i++) {
>              for (String s : strings) {
>                  len += s.length();
>              }
>          }
>        else
>          for (int i = 0; i < I; i++) {
>              for (int j = 0; j < N; j++) {
>                  len += strings[j].length();
>              }
>          }
>
>            System.out.println("method="+method + "len="+len+" indexed
> time = " + (System.currentTimeMillis() - start));
>      }
> }
>
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