Hi,

Since upgrade to Jenkins 2 (LTS 2.7.2, 2.7.3 and also with 2.22) there's a performance-issue at the Jenkins-master after about 2-4 days: The UI hangs (loading needs 5 or more minutes) and the Java-process needs about 50-99 percent CPU. It's necessary to kill the affected Java-process and to restart the Jenkins-service to re-establish our Jenkins (-farm).

By "Debugging" the Java-process (with Visual Studio native remote-debugging) I have seen, that there are 1-2 *) WIN32-Threads with highest priority, which are running without noticeable yield/sleep (and occupy almost one core - of two).
*) Sometimes there is only one of this running thread and the jenkins-master will response with respond with a delay of minutes; In other cases, there are two this (CPU-occupying) threads and jenkins is unusable ...

Currently, we are using Jenkins 2.22 with following installed plugins:

• active-directory 1.48
• all-changes 1.4
• analysis-core 1.79
• antisamy-markup-formatter 1.5
• artifactdeployer 0.33
• audit-trail 2.2
• bouncycastle-api 2.16.0
• build-failure-analyzer 1.17.1
• build-monitor-plugin 1.10+build.201608030223
• build-pipeline-plugin 1.5.4
• build-timeout 1.17.1
• build-token-root 1.4
• buildresult-trigger 0.17
• claim 2.8
• clone-workspace-scm 0.6
• cloudbees-folder 5.12
• conditional-buildstep 1.3.5
• copy-to-slave 1.4.4
• copyartifact 1.38.1
• credentials 2.1.4
• cron_column 1.4
• dashboard-view 2.9.10
• delivery-pipeline-plugin 0.9.12
• display-upstream-changes 0.1
• display-url-api 0.3
• downstream-buildview 1.9
• downstream-ext 1.8
• email-ext 2.47
• emailext-template 1.0
• envinject 1.92.1
• extra-columns 1.17
• flexible-publish 0.15.2
• groovy-postbuild 2.3.1
• htmlpublisher 1.11
• icon-shim 2.0.3
• javadoc 1.4
• jenkinswalldisplay 0.6.30
• job-parameter-summary 0.3
• job-poll-action-plugin 1.0
• jobConfigHistory 2.15
• jquery 1.11.2-0
• junit 1.18
• locale 1.2
• lockable-resources 1.8-SNAPSHOT (private-08/24/2015 10:54-jenkins)
• log-parser 2.0
• mailer 1.18
• mapdb-api 1.0.9.0
• matrix-auth 1.4
• matrix-groovy-execution-strategy 1.0.4
• matrix-project 1.6
• matrix-reloaded 1.1.3
• Matrix-sorter-plugin 1.1
• maven-plugin 2.13
• modernstatus 1.2
• nodelabelparameter 1.7.2
• ownership 0.8
• parameterized-trigger 2.32
• plot 1.9
• postbuildscript 0.17
• powershell 1.3
• preSCMbuildstep 0.3
• promoted-builds 2.27
• publish-over-ftp 1.12
• rebuild 1.25
• role-strategy 2.3.2
• run-condition 1.0
• scm-api 1.3
• script-security 1.22
• show-build-parameters 1.0
• ssh-credentials 1.12
• structs 1.5
• subversion 2.5.7
• template-project 1.5.2
• throttle-concurrents 1.9.0
• timestamper 1.8.5
• token-macro 1.12.1
• validating-string-parameter 2.3
• warnings 4.56
• windows-slaves 1.2
• workflow-step-api 2.3
• ws-cleanup 0.29
• xunit 1.102
• zentimestamp 4.2

Today, I was able to create a thread-dump (see attachment); at this time, the UI was "only" extremely slow has shown no running jobs, but the java-process has consumed 50-70% CPU.

Best regards from Salzburg,
Markus