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Spike: Investigate high TTFB for page views in mobile skin
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Description

TTFB appears to take 4-5s for the Barack Obama article on the beta cluster and production for a 2G connection.
I'd like to understand where the server side work is happening to make this so high as this accounts for the majority of first paint time.

Duration: 4hrs
Output: report (preferably for beta cluster environment) listing where time in code is spent organised by function.

Event Timeline

Jdlrobson raised the priority of this task from to High.
Jdlrobson updated the task description. (Show Details)
Danny_B set Security to None.

Is this a new perf regression relative to some time in the past? Is it only on cache misses?

Jdlrobson added a comment.EditedFeb 17 2016, 3:30 AM

@BBlack nothing new just keen to understand where all the processing is happening to identify ways to improve it.

Jdlrobson updated the task description. (Show Details)
Jdlrobson added a project: Performance-Team.
ori added a comment.Mar 7 2016, 7:04 PM

Here's a profiled request of https://en.m.wikipedia.org/wiki/Barack_Obama :

https://performance.wikimedia.org/xhgui/run/view?id=56ddcfdc7ed6ccf85595c206

Note that this was captured on mw1017, which is configured for very verbose logging, so the time spent in logging-related code is inflated.

Jdlrobson lowered the priority of this task from High to Normal.Jun 1 2016, 9:46 PM
Jdlrobson updated the task description. (Show Details)
Jdlrobson closed this task as Declined.Jul 12 2016, 11:48 PM

Doesn't look like there is anything actionable here.