Viewing Performance Plugin Result Graphs slows down jenkins

[Kay J]

Hello everyone,

I'm using latest jenkins LTS as well as up to date plugins. Plugins installed are nothing fancy: Pipeline, Github PR, Git and additional tools like timestamper etc.

Problem: When viewing performance test result graphs, created by performance plugin, we sometimes get very high cpu usage for jenkins, even after the actual graphs are rendered. CPU usage keeps going for some minutes then and speeds up. This does not always happen. I have narrowed down our reports to only contain a few hundred, max 1-2k entries. csv-files are +200kByte, so nothing really huge. Today I have noticed something very odd: When viewing the results for a specific build the text was loaded but NO graphs at all were shown and Chrome kept saying "waiting for available socket". When opening any other jenkins page, e.g. main page, other's jobs page, configs or even monitoring, It didn't load an the same socket-message was shown at the bottom of Chrome. Using another browser or an incognito windows the other pages loaded (though that specific build's perf-page had the same issues there).

When loading the page in question I get this 12x on jenkins log:

March 28th 2019, 13:52:09.498

com.squareup.okhttp.internal.Platform$JdkWithJettyBootPlatform

getSelectedProtocol

INFO

ALPN callback dropped: SPDY and HTTP/2 are disabled. Is alpn-boot on the boot class path?

Does anyone know how to fix this or what may cause this? I have search this group and via google and whatsoever, but didn't find anything.

Thanks and kind regards,

Kay