Ever increasing number of threads in the metrics plugin

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      During performance testing, we see that the number of thread that always increases, when it should not as the number of concurrent user is stable (= 1) and the job queue is also a fixed number.

      Looking at thread dump, hundred of thread are:

      "QueueSubTaskMetrics [#6]" Id=350 Group=main WAITING on hudson.model.queue.FutureImpl@6f7dbdac"QueueSubTaskMetrics [#6]" Id=350 Group=main WAITING on hudson.model.queue.FutureImpl@6f7dbdac at java.lang.Object.wait(Native Method) -  waiting on hudson.model.queue.FutureImpl@6f7dbdac at java.lang.Object.wait(Object.java:502) at hudson.remoting.AsyncFutureImpl.get(AsyncFutureImpl.java:79) at jenkins.metrics.impl.JenkinsMetricProviderImpl.lambda$asSupplier$3(JenkinsMetricProviderImpl.java:1142) at jenkins.metrics.impl.JenkinsMetricProviderImpl$$Lambda$670/282561367.get(Unknown Source) at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1604) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Number of locked synchronizers = 1 - java.util.concurrent.ThreadPoolExecutor$Worker@22c49544

      an unbounded thread pool is suspected here: https://github.com/jenkinsci/metrics-plugin/blob/21e83be64f85d343c3c9b0e0b0956021d74ade95/src/main/java/jenkins/metrics/impl/JenkinsMetricProviderImpl.java#L836-L839

      jstack and top -H output see attachments.

       

        1. jstack2.txt
          3.41 MB
        2. top-dash-h.txt
          277 kB

            Assignee:
            Jesse Glick
            Reporter:
            megathaum
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              Created:
              Updated:
              Resolved: