Public bug reported:
top reports the unity8 process is consuming about 1% CPU even when the
phone is idle (screen on):
11688 phablet 20 0 482184 101352 44872 S 1.0 5.4 0:37.10
unity8
This makes unity8 the top consumer of CPU. 1% on modern CPUs like you
find in phones is actually a very large amount of work going on (~10
million clock ticks spent executing instructions per second on a 1GHz
core).
$ system-image-cli -i
current build number: 272
device name: mako
channel: ubuntu-touch/devel-proposed/ubuntu
last update: 2015-07-29 05:53:01
version version: 272
version ubuntu: 20150729
version device: 20150708
version custom: 20150729
Running eventstat shows this CPU time is being used in 5 events per
second:
Event/s PID Task Init Function Callback
36.36 0 [swapper/0] hrtimer_start_range_ns tick_sched_timer
5.05 11688 unity8 hrtimer_start_range_ns hrtimer_wakeup
So it sounds like QtMir's frame dropper is the culprit.
** Affects: qtmir
Importance: Undecided
Status: New
** Affects: ubuntu-power-consumption
Importance: Undecided
Status: New
** Affects: qtmir (Ubuntu)
Importance: Undecided
Status: New
** Affects: unity8 (Ubuntu)
Importance: Undecided
Status: New
** Tags: power-management
** Also affects: ubuntu-power-consumption
Importance: Undecided
Status: New
** Also affects: qtmir (Ubuntu)
Importance: Undecided
Status: New
** Also affects: qtmir
Importance: Undecided
Status: New
** Description changed:
top reports the unity8 process is consuming about 1% CPU even when the
phone is idle (screen on):
11688 phablet 20 0 482184 101352 44872 S 1.0 5.4 0:37.10
unity8
This makes unity8 the top consumer of CPU. 1% on modern CPUs like you
find in phones is actually a very large amount of work going on (~10
million clock ticks spent executing instructions per second on a 1GHz
core).
$ system-image-cli -i
current build number: 272
device name: mako
channel: ubuntu-touch/devel-proposed/ubuntu
last update: 2015-07-29 05:53:01
version version: 272
version ubuntu: 20150729
version device: 20150708
version custom: 20150729
Running eventstat shows this CPU time is being used in 5 events per
second:
- Event/s PID Task Init Function Callback
- 36.36 0 [swapper/0] hrtimer_start_range_ns tick_sched_timer
- 5.05 11688 unity8 hrtimer_start_range_ns hrtimer_wakeup
+ Event/s PID Task Init Function Callback
+ 36.36 0 [swapper/0] hrtimer_start_range_ns tick_sched_timer
+ 5.05 11688 unity8 hrtimer_start_range_ns hrtimer_wakeup
- So it sounds like QtMir's frame dropper is the culprint.
+ So it sounds like QtMir's frame dropper is the culprit.
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https://bugs.launchpad.net/bugs/1479250
Title:
unity8 process using CPU when the phone is idle
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