Mustang b71/b73 + YP 5.1: 1000s of JNI Local GC roots
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Mustang b71/b73 + YP 5.1: 1000s of JNI Local GC roots
Environment:
-Win32
-Mustang b73
-YP 5.1
-Tomcat 5.5.15
A typical snapshot contains 1000s or even 10000s of GC roots of type JNI Local.
Is it a JVM regression, or is YP to blame?
-Win32
-Mustang b73
-YP 5.1
-Tomcat 5.5.15
A typical snapshot contains 1000s or even 10000s of GC roots of type JNI Local.
Is it a JVM regression, or is YP to blame?
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- Posts: 6172
- Joined: Wed Aug 11, 2004 8:37 am
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- Posts: 314
- Joined: Thu Jun 02, 2005 8:36 pm
I tried the following Mustang build:
69, 70, 71, 73
I tried different versions of Tomcat: 5.5.9 and 5.5.15
Version of YourKit used was always 5.1
All combination exhibit the same symptoms: excessive amounts of JNI Local GC roots. In our application, the number of reported GC roots was around 15000.
I'll try to verify this again on a completely clean system.
p.s. What is the "Held by JVM" GC root type? I often see this for classloader instances.
69, 70, 71, 73
I tried different versions of Tomcat: 5.5.9 and 5.5.15
Version of YourKit used was always 5.1
All combination exhibit the same symptoms: excessive amounts of JNI Local GC roots. In our application, the number of reported GC roots was around 15000.
I'll try to verify this again on a completely clean system.
p.s. What is the "Held by JVM" GC root type? I often see this for classloader instances.
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- Posts: 314
- Joined: Thu Jun 02, 2005 8:36 pm
I've used 1.6 b74 and b64 for testing. (Using JVMTI)
Target application was a simple 4K Java game:
http://javaunlimited.net/games/view.php?id=102
YourKit 5.1 shows +/- 1300 JNI Local GC roots.
I'm pretty sure that 5.0.x releases did not exhibit this problem. Are these releases archived somewhere?
Target application was a simple 4K Java game:
http://javaunlimited.net/games/view.php?id=102
YourKit 5.1 shows +/- 1300 JNI Local GC roots.
I'm pretty sure that 5.0.x releases did not exhibit this problem. Are these releases archived somewhere?
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- Posts: 314
- Joined: Thu Jun 02, 2005 8:36 pm
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- Posts: 6172
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- Posts: 6172
- Joined: Wed Aug 11, 2004 8:37 am