JDK1.4 hprof takes very few CPU sampling.
Using Merlin build 78, hprof takes only about 39 CPU sampling on my sample
test case (see below).
Using Ladybird build 24, hprof takes about 750 CPU sampling instead.
Sample test case:
import java.io.*;
public class CPUSampling {
public static void main(String[] args) {
long t0 = System.currentTimeMillis();
int n = 0;
for (int i = 0; i < 0x7FFFFFF0; i++) {
n += i;
}
long t1 = System.currentTimeMillis();
System.out.println("Real time: " + (t1 - t0));
}
}
I have seen this problem on Solaris Sparc but we shall also try on other
platform to see if it's a problem.
Using Merlin build 78, hprof takes only about 39 CPU sampling on my sample
test case (see below).
Using Ladybird build 24, hprof takes about 750 CPU sampling instead.
Sample test case:
import java.io.*;
public class CPUSampling {
public static void main(String[] args) {
long t0 = System.currentTimeMillis();
int n = 0;
for (int i = 0; i < 0x7FFFFFF0; i++) {
n += i;
}
long t1 = System.currentTimeMillis();
System.out.println("Real time: " + (t1 - t0));
}
}
I have seen this problem on Solaris Sparc but we shall also try on other
platform to see if it's a problem.
- relates to
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JDK-4467269 Poor performance on Solaris while using a profiler.
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- Resolved
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- Closed
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- Closed
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- Closed
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