Firefox OS/Performance/Boot Sequence Optimization: Difference between revisions

Firefox OS/Performance/Boot Sequence Optimization (view source)

262 bytes removed , 31 July 2014

Update based on findings

Confirmed users

125

edits

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 * B2G starts after roughly 8s of mysterious "stuff", impenetrable to bootchart
 * Based on kmsg, it is likely that time between 5s and 8s is init script execution up until <code>|class_start main|</code> in the init.rc (which launches B2G service)
-* Vertical comes up around 16s, however it does not seem to actually do anything until many seconds after that.
+* Vertical is shown as coming up around 16s, however it is actually just the preallocated process at this point, which later becomes vertical (around 22s-23s).
- <!-- although I feel like some time as been lost... (by stopwatch it seems longer than that) | is what i thought earlier, but it could just be idle
-      I should stopwatch time beginning of vertical again -->
 * As well it seems we are only at the init entry point around 4 seconds in anyway (based on inserted kernel log output)
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 **  &nbsp;7-8s = B2G
 **  &nbsp;~14s = (Nuwa)
-**  &nbsp;~16s = Vertical
+**  &nbsp;~16s = Preallocated
+**  &nbsp;~22s = Homescreen app?
 **  &nbsp;~25s = UI presented to user
 </code>
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 Of course, there is more concrete data, but that is the general trend of things.
-Note the discrepancy between the vertical process coming up and actual availability, this will be the focus of a future investigation.
 [http://people.mozilla.org/~jbailey/v121-2-premainb2g/ Experiment #1]