[Sugar-devel] Web activity example that uses html5 canvas

[James Cameron]

Summary: this Clock activity consumes significantly less CPU on XO-4
and XO-1 when implemented in Javascript.

On Tue, Apr 30, 2013 at 08:42:18PM -0300, Manuel Qui?ones wrote:
> 2013/4/30 James Cameron <quozl at laptop.org>:
> > On Tue, Apr 30, 2013 at 08:58:50AM -0300, Manuel Qui?ones wrote:
> >> Should work on other browsers now:
> >>
> >> http://manuq.github.io/clockjs/
> >
> > Agreed, works well, reasonably low CPU utilisation.  Thanks.
> 
> Excellent.  Thanks for checking the CPU consumption.

Here's a more detailed check.  Method is to run only the activity
under test, and use the serial port to run the Linux top command
configured for a 30 second sample time.

--

On XO-4 using 13.1.0:

- using Javascript, the Browse-149 process consumes 7.5% CPU, and the
  X process 3.2% CPU.  Total of 10.7% CPU.

- not using Javascript, the Clock-12 process consumes 2.7% CPU, and
  the X process 13.2% CPU.  Total of 15.9% CPU.

(Were there any changes to the algorithm?  e.g. is the Sugar activity
drawing more frequently than the Javascript activity?)

--

On XO-1 using 13.2.0, build 32004o0,

- using Javascript, the Browse-149.2 process consumes 9.8%, the X
  process 7.4%, a total of 17.2%,

- not using Javascript, the Clock-12 process consumes 10.4% and X
  process consumes 18.4%, a total of 30.8%.

--

On XO-1 using 11.3.0, build 883,

- using Javascript, the Browse 129.1 does not render the script,

- not using Javascript, the Clock-6 consumes 7.0%, and X consumed
  9.0%, a total of 16%.

-- 
James Cameron
http://quozl.linux.org.au/