[JIRA] [http_request] (JENKINS-18130) Extreamly slow UI after migration to v1.509.1

[jaroslaw.swi...@cgm.com (JIRA)]

Jaroslaw Swierk created JENKINS-18130 Extreamly slow UI after migration to v1.509.1 Issue Type: Bug Affects Versions: current Assignee: Unassigned Attachments: thread_dump1.txt Components: http_request Created: 29/May/13 12:26 PM Description: We are running a set of Jenkins instances - 1 master and 8 slave nodes with version 1.505. Recently decided to rather with to LTS releases and on 28th May we upgraded to 1.509.1 Unfortunately after the migration the UI of Jenkins became extremly slow - over 1 minute to get the page with the jobs (the "All" view contains 295 jobs at the moment). We figured out that the pages where the number of shown jobs is smaller do load significantly faster, still much slower than before the upgrade (including the maintenance screens of the jobs and Jenkins itself). We also doublechecked the load and on all nodes (master and slaves) it was <50% total CPU. We did add the parameter mentioned in JENKINS-16474 --httpKeepAliveTimeout=1000 but it did not make any difference. Eventually we did a simple test: restart the master open couple of browser windows navigating to main Jenkins page (with all jobs) captured the thread-dump The Thread-dump is attached. We noticed several blocked threads "Handling GET /jenkins/ : RequestHandlerThread[#28]" Id=17767 Group=main BLOCKED on hudson.model.RunMap@733eeab4 owned by "Handling GET /jenkins/ : RequestHandlerThread[#33]" Id=17778 For us it looks like there is some severe issue with reading jobs configurations (perhaps from slave nodes) but for sure that's just a guess. Also the startup time increased noticeably 1.505 approx 1 minute 1.509.1 over 10 minutes Environment: Ubuntu 12.04.1 LTS Project: Jenkins Priority: Major Reporter: Jaroslaw Swierk

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