Jenkins ui not loading sometimes

[Rumesh Bandara]

Hi All,

We have a Jenkins setup with 1 master + 4 worker nodes and more than 250 jobs, which would run up to a maximum of 10 executors at a given time.

However sometimes Jenkins ui doesn't load at all due to heavy load on master server.

Can we do any java tuneups or OS optimizations to avoid ui accessibility issues?

Thanks,

Rumesh

[Daniel Beck]

Do this and provide the information:
https://wiki.jenkins-ci.org/display/JENKINS/Obtaining+a+thread+dump

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[Re@lබණ්ඩා™]

Hi Daniel,

I sent you the thread dump. Please have a look.

Thanks,

Rumesh

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Re@lBanda

[Baptiste Mathus]

IIUC you sent the thread dump to Daniel privately. I doubt very much this is what he was meaning. More probably: generate that thread dump, paste it somewhere and post the link here.

Another thing wrt this: do diagnose it the first step is even to look at your gc behaviour. For that your generally enable gc logs and use a tool to analyse them and see what it gives. Looking for things like: how often does the gc chime in, how many full gc in proportion, max observed pause...

If you can generate a gc log, and post it too that could help(in that case give precise details as to when you see issues in the UI to correlate timestamps).

HTH
PS: gc logs should always be enabled, even in production.

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[Re@lබණ්ඩා™]

You may find the thread dump here - http://pasted.co/b767d9d4

Password - jenk!@#

Thanks,

Rumesh

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Re@lBanda

[Björn Pedersen]

Hi,

I see lots of

"Handling POST /jenkins/view/Dashboard/timeline/data/ from <ip> : http-bio-8080-exec-643" Id=40861 Group=main 
BLOCKED on hudson.model.RunMap@1e73d746 owned by "Handling POST /jenkins/view/Dashboard/timeline/data/ from <ip> : http-bio-8080-exec-547" Id=40663

in the dump. That indictaes getting the timeline data is slow and stalls ui updates.

What could be done:
1) reduce the amount of stored jobs (->configure deletion of old jobs)
2) faster disks

Björn

[Re@lබණ්ඩා™]

Hi Björn,

Thanks for the reply. Can you describe bit about what do you mean by "timeline data and stalls ui updates"?

Does the timeline data related to a plugin?

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Re@lBanda