unity-api-bugs team mailing list archive

[Ted Gould <ted@xxxxxxxx>]

Overview
========

I took all of the pending merges for upstart-app-launch and created a
mega-merge branch.  This is what trunk should look like after all the
code reviews are done.  And started to get some results on that.  It
includes most of the optimizations that were suggested in the previous
post except the change to libclick, which isn't available yet.  Overall
the before and after:

First start::   Was: 750ms   Mega-merge: 228ms
Second start::  Was: 738ms   Mega-merge: 143ms

Analysis
========

While most of the gains were as expected, we also got an additional
delay that was known, but not included in the previous tests.  In the
previous results we didn't have the handshake with Unity to ensure that
Unity knows an appid is starting before allowing it to execute.  This
handshake seems to be adding an additional 58ms to the first start up of
an application.  I've passed this along to the Unity team so they can
investigate further.

Further Work
============

I don't see any other hot spots in upstart-app-launch that can be worked
on currently.  When we drop surface flinger I expect about a 30ms
increase and perhaps the unity callback can be optimized as well to
decrease startup time.  Not dicussed here is the click path which will
be greatly improved with libclick.

NOTE: All results on a Galaxy Nexus, N4 is likely to be much faster.

-- 
You received this bug notification because you are a member of Unity API
bugs, which is subscribed to Upstart Application Launcher.
https://bugs.launchpad.net/bugs/1257076

Title:
  Slow app startup time

Status in Upstart Application Launcher:
  Confirmed
Status in “unity-mir” package in Ubuntu:
  Confirmed
Status in “unity8” package in Ubuntu:
  Confirmed
Status in “upstart-app-launch” package in Ubuntu:
  Confirmed

Bug description:
  Since upgrading to trusty, applications have been taking longer and
  longer to load. While on the one hand, there is feature work and
  investigation to do, see:
  https://blueprints.launchpad.net/ubuntu/+spec/appdev-1311-sdk-apps-
  performance on the other hand, this is a regression and should be
  handled via a bug report for that reason.

To manage notifications about this bug go to:
https://bugs.launchpad.net/upstart-app-launch/+bug/1257076/+subscriptions