On Tue, Apr 8, 2008 at 7:48 PM, robert engels <[EMAIL PROTECTED]> 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
[EMAIL PROTECTED] /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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