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[Research] T106966 caused doubling for many module builds
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Observed in the module builds graph at

Last 30 days:

Focused on spike:

Affected modules:

  • mediawiki.toolbar
  • startup
  • skins.minerva.beta.styles
  • skins.minerva.base.styles (and most other mobile modules)

Correlates with this SAL entry [1]:

19:48 logmsgbot: ori Synchronized wmf-config: I0990ac5b: Update URL configuration for mobile when entering mobile mode (duration: 00m 12s)

Which relates to T106966.

Event Timeline

Krinkle created this task.Aug 6 2015, 5:18 AM
Krinkle raised the priority of this task from to Needs Triage.
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I suspect same issue as before given these are all style modules (LESS compilation...)?

But why would that url configuration change affect how often MediaWiki app servers are compiling those modules? (Which happens when there is a Varnish miss for a load.php url requesting that module.)

Krinkle triaged this task as Low priority.Aug 11 2015, 2:01 AM
Krinkle moved this task from Inbox to Backlog: Small & Maintenance on the Performance-Team board.
Krinkle closed this task as Declined.Sep 4 2015, 2:04 AM
Krinkle claimed this task.

Doesn't seem important enough to investigate. For now we can only assume that we didn't so much degrade cache performance, but rather extended use of existing modules. Perhaps it wasn't working properly on mobile so we were missing a piece of data that is now included.