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[Bug 1513450] Re: ActivityIndicators cause very high cpu usage for unity8/mir even when visible: false

 

Looking at callgrind output on the desktop, there are no obvious mir
hotspots we could single out and optimize. It's similar to the output of
perf, in that quite a bit time is just spent in the GL + dri driver
code.

One more point, using the interactive governor (which we should be
defaulting to anyway) the N4 cpu usage reported by top is around 23%.

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https://bugs.launchpad.net/bugs/1513450

Title:
  ActivityIndicators cause very high cpu usage for unity8/mir even when
  visible: false

Status in Canonical System Image:
  In Progress
Status in canonical-pocket-desktop:
  New
Status in Mir:
  In Progress
Status in QtMir:
  New
Status in Online Accounts setup for Ubuntu Touch:
  New
Status in Ubuntu UI Toolkit:
  New
Status in ubuntu-system-settings package in Ubuntu:
  In Progress
Status in unity8 package in Ubuntu:
  Invalid

Bug description:
  running in window mode, open u-s-s, run top
  unity8 running at ~40% cpu on N7 cpu freq ~1GHz

  no monitor attached

  note: testing with silo 18 of mir containing
  lp:~albaguirre/mir/fix-1499039 (equivalent for 0.17)

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References