[Bug] JVMService-produce high cpu 100% #9309
Replies: 3 comments 20 replies
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We can't do an analysis from a CPU usage, especially you just post a stack showing queue blocked. |
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so What data do I need to provide here |
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There is a related discussion here, which is a little similar to this problem |
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We gave a very clear response Diagnosis is not community's responsibility. You need to do research first. If you don't know what is happening, how should we? |
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Community is not doing tech support. Don't trust us as a customer service provider. You have all the source codes, at least, you should use many existing tools to diagnose. Community could help if you have a certain question in a very clear scenario, but we wouldn't debug for you. |
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Well, I just feed back a problem. If you think you don't need to deal with it, it's OK, but I believe I'm not alone. I've seen some people meet it before. |
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@wu-sheng hello wu，I think I found the problem，this code use cpu 100% ，when i have 5000 threads in my process and JDK < 17。
As shown in the figure，When I have a lot of thread， getThreadMetrics will use more cpu。because jdk lookup thread info is slow。 |
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I don't want to adjust Tomcat or business threading model，This will bring great programming difficulty。It can't be said that I need to modify the threading model to adapt because of using SkyWalking. I believe someone will encounter such a situation in the future |
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No code was found in skywalking9, there is in8. What version of jdk? Can changing jdk solve this problem?or upgread your skywalking. |
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Is there any temporary plan? In fact, I have also encountered this problem |
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You can choose a temporary plan : 1.You can Upgrade jdk version to 11 to solve this problem perfectly。 |
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Thanks a lot |
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Maybe you can try: java -Dskywalking.jvm.metrics_collect_period=60 |
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This may be a solution that can alleviate the problem, but it will result in a loss of accuracy |
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Search before asking
Apache SkyWalking Component
Java Agent (apache/skywalking-java)
What happened
After the service runs for a period of time, SkywalkingAgent-5-JVMService-produce-0 will occupy 100% CPU
"SkywalkingAgent-5-JVMService-produce-0" #9 daemon prio=5 os_prio=0 cpu=199370183.56ms elapsed=606196.06s tid=0x00007feb31359800 nid=0x7c5 runnable [0x00007feae9e99000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x0000000700399d28> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
What you expected to happen
nothing
How to reproduce
Not all services will happen, only one can be seen。
environment：
jdk: openjdk version "1.8.0_312"
runtime: k8s-container
Anything else
No response
Are you willing to submit PR?
Code of Conduct
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