Intel NDK x86A few Benchmarks

Francesca Tosi - Alberto Mancini13 Febbraio 2013

?!?● Ma che ci fanno

Alberto e Francesca!??!?!

?!?● Ma che ci fanno

Alberto e Francesca!??!?!

● Ma non erano quelli fissati con le app web!??!?!

Inte

l

Francesco BaldassarriItalian Community ManagerIntel Software and Services Group

email: francescoX.baldassarri@intel.comtwitter: @francesco_1985facebook: www.facebook.com/francesco1985linkedin: it.linkedin.com/in/fbaldassarri/

Inte

l Dev

ices I devices Intel sono compatibili con l’

ecosistema Android*.

- Android* Dalvik* apps

- These will directly work, Dalvik has beenoptimized for Intel® platforms.

- Android NDK apps

- Most will run without any recompilation on consumer platforms.

- Android NDK provides an x86 toolchain since 2011

- A simple recompile using the Android NDK yields the best performance

- If there is specific processor dependent code, porting may be necessary

Inte

l Dev

ices Intel Investe molto in tool di sviluppo per

Android

- Faster Android Emulator on Intel (Intel HAXM)

- Intel Threading Building Blocks (TBB)

- Intel Graphics Performance Analyzer (GPA)

- Intel Integrated Performance Primitives (IPP)

- Intel Optimizing Compiler (C++)

- Intel Beacon Mountain

- Project Anarchy

Inte

l Dev

ices Cosa sta facendo intel per Android

Inte

l Dev

ices Intel devices on the market with Intel Inside

Libr

erie

nat

ive

3rd party Libraries with x86 support

???

Ma voi due che c’entrate con le app

native !?!?

ND

KA noi interessa sperimentare la

rapidità/potenzialità della NDK

App NDK

Applicazione Android che usa librerie native

Ben

chm

arks

e testarne le performance

Benchmark

C/Java/Javascript

AR

on

mob

ile Nei lavori che facciamo una operazione semplice ma costosa è fare il grayscale sulle immagini

picshare.jooink.com

GW

T-B

oofc

vGWT-Boofcv sample at:http://goo.gl/3IJQgs

Ben

chm

arks -

Test

are

na Galaxy Tab3

Intel Atom CPU Z25602 core - 1.60 GHz Android 4.4.2Architettura i686

Rul

es RGB jbyte[1024*1024*3]

Average on 1000 runs

grayjbyte[1024*1024]

1

0.299*R+0.587*G+0.114*B → Y2

3

Com

petit

ors Benchmarks on:

Chrome <Uint8Array>Firefox <Uint8Array>Aurora <Uint8Array>Java <byte> NDK <jbyte>IPP <Ipp8u>

Det

ails

(HA

XM) Bundled in BeaconMountain

http://software.intel.com/en-us/android/articles/intel-hardware-accelerated-execution-manager

cambia la vita con le immagini x86

Attenzione pianta OSX, maverickinstallare lo hotfix

Cod

ice

(Jav

a) Java:

void compute(byte[] in, byte[] out) { for(int i=0, j=0; i< out.length; i++, j+=3) out[i] =

(byte)(0.299 * in[j] + 0.587 * in[j+1] + 0.114 * in[j+2]); }

Det

ails

(ND

K) https://developer.android.com/tools/sdk/ndk/index.html

La documentazione non e’ il suo forte ...

https://github.com/jooink/ndk-cpuid

● start the (intel) avd (url)● enter in the jni folder & execute 'ndk-build'● from the CPUIDApp root dir execute 'ant debug'● adb install -r bin/CPUIdApp-debug.apk

Cod

ice

(C, j

ni) void JNICALL … jbyteArray in, jbyteArray out) {

jsize len_out = (*env)->GetArrayLength(env, out); ... jbyte *body_out = (*env)->GetByteArrayElements(env, out, 0); for(i=0, j=0; i< len_out; i++, j+=3) body_out[i] = (jbyte)(0.299 * body_in[j] + … );

(*env)->ReleaseByteArrayElements(env, in, body_in, 0); ... }

Det

ails

(IPP

) Bundled in BeaconMountain beh … la ‘preview’

http://software.intel.com/en-us/intel-ipp

… ed avete la IPP per android x86 !!!

Scaricate la versione per linux ( la evaluation, or 199$ :( )

Installatela ( vi serve una macchina linux )

Copiate le librerie (*.a) e gli include (*.h) (32bit statici non-threaded)

Cod

ice

(IPP)

… jni ...

IppiSize srcRoi = { 1024, 1024 }; Ipp8u* pSrc = body_in; Ipp8u* pDst = body_out; ippiRGBToGray_8u_C3C1R(pSrc ,1024, pDst, 1024, srcRoi);

… jni ...

Res

ults

nat

ive

Res

ults

nat

ive

minmaxavg

Cod

ice

(js) var len_out = outb.length;

var i,j;for(i=0, j=0; i< len_out; i++, j+=3)

outb[i] = (0.299 * inb[j] + 0.587 * inb[j+1] + 0.114 *inb[j+2]);

var buffer_in = new ArrayBuffer(size*3);var buffer_out = new ArrayBuffer(size);

var inb = new Uint8Array(buffer_in);var out = new Uint8Array(buffer_out);

Res

ults

jsminmaxavg

Gra

zie Francesca Tosi

francesca@jooink.com

Alberto Mancini alberto@jooink.com

Github: github.com/jooink/

www.jooink.comjooink.blogspot.com