Canonical System Image

camera_service eats lots of CPU even when in photo roll

Bug #1481558 reported by Michi Henning on 2015-08-05

This bug affects 3 people

Affects		Status	Importance	Assigned to	Milestone
	Canonical System Image	Fix Released	Medium	Bill Filler	Canonical System Image backlog
	camera-app (Ubuntu)	Fix Released	Medium	Florian Boucault

Bug Description

I have about a dozen photos and videos on my mako.

When I run the camera app and look at the app log, I see loads of messages like this:

libust[6087/6105]: Error: Error opening shm /lttng-ust-wait-5 (in get_wait_shm() at lttng-ust-comm.c:958)
libust[6087/6106]: Error: Error opening shm /lttng-ust-wait-5-32011 (in get_wait_shm() at lttng-ust-comm.c:958)
ext1: 1, ext2: 0
ext1: 1, ext2: 0
ext1: 1, ext2: 0
ext1: 1, ext2: 0
ext1: 1, ext2: 0
ext1: 1, ext2: 0
ext1: 1, ext2: 0
ext1: 1, ext2: 0
ext1: 1, ext2: 0
ext1: 1, ext2: 0
ext1: 1, ext2: 0
ext1: 1, ext2: 0
ext1: 1, ext2: 0
ext1: 1, ext2: 0
ext1: 1, ext2: 0

These messages are continuously being written to the log, whether I'm in the view finder or the photo roll. With the app just sitting on the photo roll page doing nothing, top reports around 40% CPU usage.

Related branches

lp://staging/~fboucault/camera-app/no_cpu_usage_in_photo_roll

Merged into lp://staging/camera-app/staging at revision 621

Ugo Riboni (community): Needs Information on 2015-12-08

Revision history for this message

Michi Henning (michihenning) wrote on 2015-08-05:

BTW, that's with the latest rc-proposed image:

$ system-image-cli -i
current build number: 205
device name: mako
channel: ubuntu-touch/rc-proposed/ubuntu
last update: 2015-08-05 02:21:57
version version: 205
version ubuntu: 20150804
version device: 20150210
version custom: 20150804

Revision history for this message

Michi Henning (michihenning) wrote on 2015-08-28:

I'm still seeing this with the latest mako image from dc-proposed at version 226. Permanently eating half a CPU is a serious bug.

Changed in camera-app:
importance:	Undecided → Critical

Revision history for this message

Florian Boucault (fboucault) wrote on 2015-11-18:

While the view finder is shown the camera is going to use CPU continuously, there is no way around that.
While in the photo roll, I do not see the camera app using much CPU however camera_service is. This needs to be investigated and fixed.

Changed in camera-app:
status:	New → Confirmed
importance:	Critical → High
summary:	- Camera app eats lots of CPU + camera_service eats lots of CPU even when in photo roll

Revision history for this message

Michi Henning (michihenning) wrote on 2015-11-19:

Hmmm... This is not what I'm seeing on Mako. When looking at the photo roll, it is camera-app that's eating all the CPU, at 35-40%. camera-service is using about 1.6%.

Revision history for this message

Bill Filler (bfiller) wrote on 2015-11-30:

on latest rc-proposed on krillin I'm seeing camera-app use 20-25% and camera-service using 7-10% when on the photo roll
we should definitely fix this - when on photo roll camera-app should not be consuming any cpu

Changed in camera-app:
assignee:	nobody → Florian Boucault (fboucault)
Changed in canonical-devices-system-image:
milestone:	none → ww02-2016
assignee:	nobody → Bill Filler (bfiller)
importance:	Undecided → High
status:	New → Confirmed

Florian Boucault (fboucault) on 2015-12-02

Changed in camera-app:
status:	Confirmed → In Progress
Changed in canonical-devices-system-image:
status:	Confirmed → In Progress

Jean-Baptiste Lallement (jibel) on 2016-01-15

Changed in canonical-devices-system-image:
milestone:	ww02-2016 → ww08-2016

Revision history for this message

Florian Boucault (fboucault) wrote on 2016-01-15:

We fixed camera-app usage in photo roll, now 0% but not camera-service which is still eating the same amount as before.

Changed in camera-app:
status:	In Progress → Triaged
Changed in canonical-devices-system-image:
status:	In Progress → Confirmed
Changed in camera-app:
status:	Triaged → Confirmed

Florian Boucault (fboucault) on 2016-01-20

Changed in camera-app (Ubuntu):
status:	New → Confirmed
importance:	Undecided → High
assignee:	nobody → Florian Boucault (fboucault)

Bill Filler (bfiller) on 2016-01-26

Changed in canonical-devices-system-image:
milestone:	ww08-2016 → backlog
importance:	High → Medium
Changed in camera-app:
importance:	High → Medium
Changed in camera-app (Ubuntu):
importance:	High → Medium
no longer affects:	camera-app

Bill Filler (bfiller) on 2016-02-24

Changed in camera-app (Ubuntu):
status:	Confirmed → Fix Released
Changed in canonical-devices-system-image:
status:	Confirmed → Fix Released

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