Gpgpu with ARM

GPGPU ON ARM Tom Gall [email protected]

SESSION GOALS

• What

activity should Linaro pursue?

• What

open source projects should we work with?

BOUNDARIES

• Lets

not do any PHD dissertations

• Output

must be open source

• Optimized

stack should of course advance member goals

PARALLEL COMPUTING

Grid OpenStack

MPI/OpenMPI

OpenMP/pthreads

Multi-machine

NEON

Single machine

•

Granularity

OPEN CL • Originally

proposed by Apple

• API

for using your resources including the GPU as a general purpose power house

• Khronos • Open

standard (holders of OpenGL)

Compute Language

• ANSI-C99 • Open

w additions

= anyone can implement

HSA • Heterogeneous

System Architecture

• hsafoundation.com • HSA •A

standards out for review

better OpenCL

• Better

debug, HSAIL

QUALITIES IN A CANDIDATE • Task

parallelism

• Break • Data

parallelism

• Same • Big

up task over threads

operation over lots of data

wins for computationally significant data parallel algs

• Bad • Lots

of pointer chasing

• Calculations

that require lots of communication or result dependent

PROJECTS

• Libjpeg

vs libjpeg turbo

• SQLite • Hadoop • HipHop?

- map reduce

LIBJPEG

• Software, NEON, OpenCL • Android

comparison possible

& Linux

• code.google.com/p/jpeg-opencl/source/checkout

SQLITE • Cuda

(nVidia only)

• Implemented

subset of SQLite vm on gpu

• Pbbakkum.com/db • Claim

of 20x-70x

• Source

available, we could port to OpenCL

HADOOP • MapReduce

is a major piece of Hadoop

• http://ieeexplore.ieee.org/xpl/articleDetails.jsp?

reload=true&arnumber=6227786 • Measured • Used

1.6-2x improvement

jocl (java bindings for OpenCL)

• Source?

PIGLIT • Mesa

test suite

• Includes • Should

a number of OpenCL tests

be fairly straight forward to add to LAVA

• Linux • Android

GRAND CENTRAL

• libdispatch

- open source

• http://libdispatch.macosforge.org • Can

go hand in hand with OpenCL

• Needs

llvm, libkqueue, blocks runtime

MORE?