On Sep 1, 7:18 pm, WoodManEXP <[email protected]> wrote:
> In any event the Android seems really slow becasue a block like
>
> for(int i=0; i<1000000;i++) {
> c[i] = b[i]
>
> }
>
> takes like 20-25 seconds to execute (On Intel Pentium, eq #, such a
> thing executes in a flash).
On a G1, I can do twice that many in well under a second:
Filling...
Copying...
Done in 484.527591 ms.
Complete code is:
public class Foo {
public static final int SIZE = 2 * 1000 * 1000;
public static void main(String[] args) {
byte[] bigByte = new byte[SIZE];
char[] bigChar = new char[SIZE];
long startWhen, endWhen;
int i;
System.out.println("Filling...");
for (i = 0; i < SIZE; i++)
bigByte[i] = (byte) i;
System.out.println("Copying...");
startWhen = System.nanoTime();
for (i = 0; i < SIZE; i++) {
bigChar[i] = (char) (bigByte[i] & 0xff);
}
endWhen = System.nanoTime();
System.out.println("Done in " + (endWhen - startWhen) /
1000000.0
+ " ms.");
}
}
(Instructions for running stand-alone tests on the G1 can be found in
dalvik/docs/hello-world.html)
http://android.git.kernel.org/?p=platform/dalvik.git;a=blob_plain;f=docs/hello-world.html;hb=HEAD
Changing it to merge pairs of bytes into a short:
char[] bigChar = new char[SIZE/2];
...
for (i = 0; i < SIZE/2; i++) {
bigChar[i] = (char)
(bigByte[i << 1] & 0xff | bigByte[(i << 1)+1] << 8);
}
increased the time to 780.5 ms. Nowhere near the 20+ seconds you're
seeing.
Is there a chance that your code is running so slowly because
something else in your app or in the system is thrashing?
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