Optimizing EFL All You Must Know on Boosting CPU, Memory and Battery - - PowerPoint PPT Presentation

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Optimizing EFL

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

Cedric BAIL – Senior Open Source Developer Samsung Open Source Group cedric@osg.samsung.com

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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 ?

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Enlightenment Foundation Libraries

What is this “Enlightenment Foundation Libraries” ?

• Toolkit created for Enlightenment 17

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Enlightenment Foundation Libraries

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

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Enlightenment Foundation Libraries

X11 OpenGL EINA

EVAS

EET EMBRYO EDJE ELEMENTARY E-DBUS DBUS ECORE

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

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Enlightenment Foundation Libraries

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

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Enlightenment Foundation Libraries

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Enlightenment Foundation Libraries

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

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Enlightenment Foundation Libraries

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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

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Benchmarking over the course of time with Expedite

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

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Benchmarking over the course of time with Expedite

expedite score 50 100 150 200 250 300 350 400 Software i7 GL i7 RPi

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Benchmarking over the course of time with Expedite

100 200 300 400 500 600 700 1.8 1.9 1.10 1.11 1.12

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Benchmarking over the course of time with Expedite

1.8 1.9 1.10 1.11 1.12 300 310 320 330 340 350 360 EVAS SPEED (WEIGHTED)

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Benchmarking over the course of time with Expedite

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

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Impact of preloading and shared cache infrastructure

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

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Impact of preloading and shared cache infrastructure

Reducing memory usage per application help

Having 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

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Impact of preloading and shared cache infrastructure

Reducing memory usage globally is necessary

Every 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 !

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Impact of preloading and shared cache infrastructure

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

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Impact of preloading and shared cache infrastructure

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 !!!

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Impact of preloading and shared cache infrastructure

RPi Free memory RPi Cached memory 10000 20000 30000 40000 50000 60000 70000 80000 None Quicklaunch CServe2 Quicklaunch + CServe2

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Impact of preloading and shared cache infrastructure

ELM_FIRST_FRAME=t elemines 0,5 1 1,5 2 2,5 3 3,5 4 4,5 None Quicklaunch CServe2 Quicklaunch + CServe2

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Impact of preloading and shared cache infrastructure

Power consumption :

Normal = 2W * 4.20s Quicklaunch = 2W * 2.97s Cserve2 = 2W * 4.26s Quicklaunch + Cserve2 = 2W * 3.10s (Energy consumption is an average)

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Impact of preloading and shared cache infrastructure

Conclusion

Preloading 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

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Impact of shared instance

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 !

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Impact of shared instance

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Impact of shared instance

RPi Free memory RPi Cached memory 10000 20000 30000 40000 50000 60000 70000 80000 Multi process Single instance

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Impact of shared instance

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

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Energy consumption analysis with ACME

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

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Energy consumption analysis with ACME

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Energy consumption analysis with ACME

You can find more information at :

https://baylibre.com/acme/

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Enlightenment Foundation Libraries

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 !

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Samsung Open Source Group

WE ARE HIRING !

Twitter: @SamsungOSG Email: osg@samsung.com

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Questions ?

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Thank you.