optimizing efl - events.static.linuxfound.org

1Samsung Open Source Group

Optimizing EFL

All You Must Know on Boosting CPU, Memory and Battery Usage Performance

Cedric BAIL – Senior Open Source Developer

Samsung Open Source Group

[email protected]

2


Enlightenment Foundation Libraries

Quick what is this “Enlightenment Foundation Libraries” ?

Benchmarking over the course of time with expedite

Impact of preloading and shared cache infrastructure

Impact of shared instance

Energy consumption analysis with ACME

Questions ?

3



What is this “Enlightenment Foundation Libraries” ?

• Toolkit created for Enlightenment 17

4



Enlightenment Foundation Libraries ?

• GUI toolkit targetting embedded device

• Designed for creating a WM, ended up ready for any kind of applications

• Licensed under a mix of LGPL and BSD license

• Optimized to reduce CPU, GPU, memory and battery usage

• Support international language requirement (LTR/RTL, UTF8)

• Support all variation of screen and input device (scale factor)

• Full themability (layout of the application included)

• Profile support

• Could be made to fit in 8MB with a minimal set of dependencies included

• Modular design

5



X11

OpenGL

EINAMEMPOOL

EVAS

JPEG

PNG

GIF

TIFF

EET

SVG

MORE...

XRENDER

OPENGL/ES

X11 (SOFTWARE)

FB (SOFTWARE)

MORE...

EET

EMBRYO

EDJE

ELEMENTARY E-DBUS DBUS

ECOREFILE

X11

CON

IPC

FB

EVAS

QUARTZ

INPUT

JOB

SDL

WIN32/CE

MORE...

EFREET

MEMORY (RAM) (DATA STRUCTURES)

DATA IN STORAGE (DISK/FLASH ETC.)

PIXELS ON A DISPLAY

IMAGE FILES IN STORAGE

OTHER APPLICATIONS AND SERVICES

USER INTERACTION AND FEEDBACK

INPUT DEVICES AND OTHER SYSTEM SERVICES AND COMPONENTS

ABSTRACTED UI COMPONENTS FROM STORAGE

FREEDESKTOP.ORG STANDARDS LAYER

FAST VIRTUAL MACHINE FOR LOGIC AUGMENTATION

6



Evas :

• The brain of EFL

• Scene graph library with more than 10 years of optimization in it

• Glytch free rendering

• Reduce overdrawing

• Reduce waste of memory by deduplicating as much as possible

• Compressed glyph rendering

• Portable (SDL, X11, Wayland, FB, DRM, Windows, Mac OS X, ...)

• Optimized software renderer (MMX, SSE*, Neon)

• Optimized use of GPU (optional)▪ Support partial update if driver do

▪ Reduce context and texture switch as much as possible

▪ Reduce memory overhead

7



8



Elementary :

• Widgets toolkit

• Use Edje and Evas infrastructure

• Screen and input independence achieved by :▪ Scale factor

▪ Finger size

• Profile support (define configuration on a per Window basis)

• Fully themable

• Support touchscreen

9



10


Benchmarking over the course of time with Expedite

Optimization :Before optimizing anything, you need numbers !

Any benchmark is a partial view of an application

Try to reveal the biggest cost of all application into one

Never perfect, never going to be a complete perfect picture

You need reference point that are valid from one test to another

11



Expedite :EFL application trying to force as much frame on screen

Currently tests only Evas primitive directly

Work with all previous EFL version

Tests specific path in our rendering pipeline

If EFL support a target, expedite will work

Give you a picture on how powerful a hardware is

12



expedite score0

50

100

150

200

250

300

350

400

Software i7

GL i7

RPi

13



0

100

200

300

400

500

600

700

1.8

1.9

1.10

1.11

1.12

14



1.8 1.9 1.10 1.11 1.12300

310

320

330

340

350

360

EVAS SPEED (WEIGHTED)

15



Conclusion :Benchmarking in a reliable way is difficult

Even with multiple round

Require some human intervention to understand what is going on

Give an overall idea of what is going on

Need more complex code

Need to improve logic to determine when the mesure is correct

16



EFL is designed for the embedded world, but is used on the desktop

Multiple application running at the same time

The more application can fully run at the same time the better

Time to first frame is critical

Scenario with no swap common

17



Reducing memory usage per application helpHaving a software backend help (GL consume more than 10MB)

Letting the kernel deal when to throw away data help (mmap)

Reducing memory duplication per process is a first step

• String share

• Eet

• Image/Font cache

• Copy On Write

18



Reducing memory usage globally is necessaryEvery application that is using EFL as at least one thing in common

EFL !Meaning that part of libraries initialisation could be shared

Welcome quicklaunch !

If application use the system theme, they have visually a lot in common

Image/Glyph/Font geometry are costly to load and consume memory

Sharing is doable, but tricky

Welcome Cserve2 !

19



Pros of quicklaunch :Libraries are preloaded in memory

Link is done once

Partial initialisation done once

Preload library in memory at boot time

Cons of quicklaunch :Tools need to read the updated argv[0]

Quicklaunch does some of the job of systemd –user

20



Pros of CServe2 :Decode image/glyph once

Share pixels data

Faster startup time, reduced memory usage

Cons of quicklaunch :Propagate security credential not implemented, only user level

No integration with kernel to act in OOM situation

Difficult to do restart on crash without crashing client

Need client to have the same theme !!!

21



RPi Free memory RPi Cached memory0

10000

20000

30000

40000

50000

60000

70000

80000

None

Quicklaunch

CServe2

Quicklaunch + CServe2

22



ELM_FIRST_FRAME=t elemines0

0,5

1

1,5

2

2,5

3

3,5

4

4,5

None

Quicklaunch

CServe2

Quicklaunch + CServe2

23



Power consumption :Normal = 2W * 4.20s

Quicklaunch = 2W * 2.97s

Cserve2 = 2W * 4.26s

Quicklaunch + Cserve2 = 2W * 3.10s

(Energy consumption is an average)

24



ConclusionPreloading and partial initialisation of EFL does payoff

Could be improved by preconnecting to X and preloading theme

Need to find a proper fix to integrate with systemd user session

25



Alternative to preloading: single instance

Use case, one process, multiple window : Terminology

Doesn't apply to all applications

Doesn't provide process separation...

One goes down, everyone goes down !

26



27



RPi Free memory RPi Cached memory0

10000

20000

30000

40000

50000

60000

70000

80000

Multi process

Single instance

28



Conclusion :It does improve cost especially for big desktop application

Would be a good potential for systemd –user session

Has limitation that can't be overcome, so not a generic solution

29



All energy mesurement where done with Open Source tools

Require a specific hardware based on BeagleBone Black

Great potential for automatic testing

Easy to read sensor without using the provided tool

Still a lot of change going on

Nice web interface and native user interface

Not perfect yet, but it's open source, so we can get it to do what we need !

Still lacking a benchmark mode

30



31



You can find more information at :

https://baylibre.com/acme/

32



EFL community cares about performance

So does Samsung for all its product line

There is always room for improvements

Evas scenegraph logic is more than 10 years old, refactoring and cleaning is necessary

Improving our tests suites and especially our benchmark is a permanent task

Never ending story ! Always something to improve !

33



WE ARE HIRING !Twitter: @SamsungOSGEmail: [email protected]


Questions ?


Thank you.

optimizing efl - events.static.linuxfound.org

Documents