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Java Mission Control 7.1 shows too few method profiling samples
The Next CEO of Stack OverflowJava Mission Control says “few profiling samples”, why, and what are my other options?Java Mission Control Heap ProfileWhat are the differences between JVisualVM and Java Mission Control?Java Flight Recorder / Java Mission Control custom events for TomcatCustom JFR Java mission control eventsMagnify Y axis in Java Mission Control chartsHow to profile thown exception in Java Mission Control?Java Mission Control Listener?Java Mission Control says “few profiling samples”, why, and what are my other options?How to interpret lambda in memory view of Java Mission ControlMonitoring Locks with Java Flight Recorder and Java Mission Control
A similar question was asked here.
I'm profiling an Open JDK 11.0.2 application using JMC 7.1.0 which I've built according to the instructions.
The application is utilizing about 3 cores, there is no excessive gc and only a small portion of the time threads are doing native method calls that actually utilize CPU.
I'm using the default method sampling interval of 10ms.
I enabled debug meta data outside of safepoints by using:
-XX:+UnlockDiagnosticVMOptions -XX:+DebugNonSafepoints
The number of samples taken is much less then I expect.
Assuming conservatively that there is 1 on cpu thread running non native code at each sampling point, I would expect 100 samples / second. Yet I'm seeing only 1 sample / second.
The machine itself is usually 50% idle, so the sampling thread is not starved.
What can be causing the number of samples to be that low?
jfr java-mission-control
edited Mar 20 at 6:48
Kire Haglin
3,9361420
asked Mar 7 at 14:56
Amir HadadiAmir Hadadi
1449
add a comment |
A similar question was asked here.
I'm profiling an Open JDK 11.0.2 application using JMC 7.1.0 which I've built according to the instructions.
The application is utilizing about 3 cores, there is no excessive gc and only a small portion of the time threads are doing native method calls that actually utilize CPU.
I'm using the default method sampling interval of 10ms.
I enabled debug meta data outside of safepoints by using:
-XX:+UnlockDiagnosticVMOptions -XX:+DebugNonSafepoints
The number of samples taken is much less then I expect.
Assuming conservatively that there is 1 on cpu thread running non native code at each sampling point, I would expect 100 samples / second. Yet I'm seeing only 1 sample / second.
The machine itself is usually 50% idle, so the sampling thread is not starved.
What can be causing the number of samples to be that low?
jfr java-mission-control
edited Mar 20 at 6:48
Kire Haglin
3,9361420
asked Mar 7 at 14:56
Amir HadadiAmir Hadadi
1449
add a comment |
A similar question was asked here.
I'm profiling an Open JDK 11.0.2 application using JMC 7.1.0 which I've built according to the instructions.
The application is utilizing about 3 cores, there is no excessive gc and only a small portion of the time threads are doing native method calls that actually utilize CPU.
I'm using the default method sampling interval of 10ms.
I enabled debug meta data outside of safepoints by using:
-XX:+UnlockDiagnosticVMOptions -XX:+DebugNonSafepoints
The number of samples taken is much less then I expect.
Assuming conservatively that there is 1 on cpu thread running non native code at each sampling point, I would expect 100 samples / second. Yet I'm seeing only 1 sample / second.
The machine itself is usually 50% idle, so the sampling thread is not starved.
What can be causing the number of samples to be that low?
jfr java-mission-control
edited Mar 20 at 6:48
Kire Haglin
3,9361420
asked Mar 7 at 14:56
Amir HadadiAmir Hadadi
1449
A similar question was asked here.
I'm profiling an Open JDK 11.0.2 application using JMC 7.1.0 which I've built according to the instructions.
The application is utilizing about 3 cores, there is no excessive gc and only a small portion of the time threads are doing native method calls that actually utilize CPU.
I'm using the default method sampling interval of 10ms.
I enabled debug meta data outside of safepoints by using:
-XX:+UnlockDiagnosticVMOptions -XX:+DebugNonSafepoints
The number of samples taken is much less then I expect.
Assuming conservatively that there is 1 on cpu thread running non native code at each sampling point, I would expect 100 samples / second. Yet I'm seeing only 1 sample / second.
The machine itself is usually 50% idle, so the sampling thread is not starved.
What can be causing the number of samples to be that low?
jfr java-mission-control
jfr java-mission-control
edited Mar 20 at 6:48
Kire Haglin
3,9361420
asked Mar 7 at 14:56
Amir HadadiAmir Hadadi
1449
edited Mar 20 at 6:48
Kire Haglin
3,9361420
asked Mar 7 at 14:56
Amir HadadiAmir Hadadi
1449
edited Mar 20 at 6:48
Kire Haglin
3,9361420
edited Mar 20 at 6:48
Kire Haglin
3,9361420
edited Mar 20 at 6:48
Kire Haglin
3,9361420
3,9361420
asked Mar 7 at 14:56
Amir HadadiAmir Hadadi
1449
asked Mar 7 at 14:56
Amir HadadiAmir Hadadi
1449
asked Mar 7 at 14:56
Amir HadadiAmir Hadadi
1449
1449
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
This is probably due to a bug introduced in JDK 11 which appear in applications with many threads. It has been fixed in JDK 12 and backported to 11.0.3.
For details see:
https://bugs.openjdk.java.net/browse/JDK-8215727
Regarding the sampling interval. The default rate is 20 ms, but it doesn't mean there will be 50 samples / seconds. It is the interval the JVM tries to samples one or more threads.
answered Mar 20 at 6:39
Kire HaglinKire Haglin
3,9361420
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
This is probably due to a bug introduced in JDK 11 which appear in applications with many threads. It has been fixed in JDK 12 and backported to 11.0.3.
For details see:
https://bugs.openjdk.java.net/browse/JDK-8215727
Regarding the sampling interval. The default rate is 20 ms, but it doesn't mean there will be 50 samples / seconds. It is the interval the JVM tries to samples one or more threads.
answered Mar 20 at 6:39
Kire HaglinKire Haglin
3,9361420
add a comment |
This is probably due to a bug introduced in JDK 11 which appear in applications with many threads. It has been fixed in JDK 12 and backported to 11.0.3.
For details see:
https://bugs.openjdk.java.net/browse/JDK-8215727
Regarding the sampling interval. The default rate is 20 ms, but it doesn't mean there will be 50 samples / seconds. It is the interval the JVM tries to samples one or more threads.
answered Mar 20 at 6:39
Kire HaglinKire Haglin
3,9361420
add a comment |
This is probably due to a bug introduced in JDK 11 which appear in applications with many threads. It has been fixed in JDK 12 and backported to 11.0.3.
For details see:
https://bugs.openjdk.java.net/browse/JDK-8215727
Regarding the sampling interval. The default rate is 20 ms, but it doesn't mean there will be 50 samples / seconds. It is the interval the JVM tries to samples one or more threads.
answered Mar 20 at 6:39
Kire HaglinKire Haglin
3,9361420
This is probably due to a bug introduced in JDK 11 which appear in applications with many threads. It has been fixed in JDK 12 and backported to 11.0.3.
For details see:
https://bugs.openjdk.java.net/browse/JDK-8215727
Regarding the sampling interval. The default rate is 20 ms, but it doesn't mean there will be 50 samples / seconds. It is the interval the JVM tries to samples one or more threads.
answered Mar 20 at 6:39
Kire HaglinKire Haglin
3,9361420
edited Mar 20 at 6:53
answered Mar 20 at 6:39
Kire HaglinKire Haglin
3,9361420
answered Mar 20 at 6:39
Kire HaglinKire Haglin
3,9361420
answered Mar 20 at 6:39
Kire HaglinKire Haglin
3,9361420
3,9361420
add a comment |
add a comment |
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