quick JAVA question!

[gopunk]

what does it mean when your program terminates with something like this:

18.510u 0.030s 0:18.63 99.5% 0+0k 0+0io 1587pf+0w


this is clearly the result of the "time" command, but i don't know why it would be displaying this. it's a really simple loop that just increments from 0 by 1 until it reaches N. i set N to be 1,000,000,000. for smaller values like 10,000,000, it does not do this.

thanks 🙂

 

[notfred]

never seen that before.. .care to post code?

 

[gopunk]

class Loop1
{
public static void main(String[] args)
{
int sum = 0;
int max = Integer.parseInt(args[0]);
long otime = System.currentTimeMillis();
for(int i=0; i < max; i++)
{
sum++;
}
long ntime = System.currentTimeMillis();
System.out.println(ntime - otime);
}
}

take it easy, i'm a java newbie 😛

as you can see, this program just returns an approximate running time in milliseconds. the time output i showed you earlier is not part of the ntime-otime stuff.



and here are my runs:

fiji% java Loop1 12000000
220
fiji% java Loop1 20000000
398
fiji% java Loop1 30000000
542
fiji% java Loop1 40000000
725
fiji% java Loop1 60000000
1082
fiji% java Loop1 70000000
1423
fiji% java Loop1 80000000
1472
fiji% java Loop1 90000000
1618
fiji% java Loop1 1000000000
17857
18.510u 0.030s 0:18.63 99.5% 0+0k 0+0io 1587pf+0w

the last one is the one i'm talking about here... notice how none of the other ones have the extra stuff.

 

[Yomicron]

hmm... it runs fine on my machine, what platform are you running on? and what version of the Java Runtime Environment are you using?

 

[gopunk]

Originally posted by: Yomicron
hmm... it runs fine on my machine, what platform are you running on? and what version of the Java Runtime Environment are you using?

fiji% java -version
java version "1.4.1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-b21)
Java HotSpot(TM) Client VM (build 1.4.1-b21, mixed mode)
fiji% uname -srv
Linux 2.4.18-6smp.1 #10 SMP Tue Sep 24 12:13:28 PDT 2002


i think it is something to do with csh or something.... check this out:

fiji% bash
bash-2.05a$ java Loop1 1000000000
17858
bash-2.05a$ exit
exit
18.570u 0.060s 0:54.76 34.0% 0+0k 0+0io 1953pf+0w

 

[notfred]

No idea, looks like a bug in the currentTimeMillis method. Either that or an overflow or something.

 

[Ameesh]

waht does this have to do with java? its your loonicx box thats outpputting the process stats.

 

[gopunk]

Originally posted by: notfred
No idea, looks like a bug in the currentTimeMillis method. Either that or an overflow or something.

yea i'm thinking it's something like that.... drat. oh well, not my box 😀

Originally posted by: Ameesh
waht does this have to do with java? its your loonicx box thats outpputting the process stats.

yea, you're probably right.