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GPGPU ON ARM
Tom Gall
tom.gall@linaro.org
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
Granularity
•
NEON
Grid
OpenStack
MPI/OpenMPI OpenMP/pthreads
Multi-machine Single machine
OPEN CL
• Originally proposed by Apple
• API for using your resources including the GPU as a general
purpose power house
• Khronos standard (holders of OpenGL)
• Open Compute Language
• ANSI-C99 w additions
• Open = anyone can implement
HSA
• Heterogeneous System Architecture
• hsafoundation.com
• HSA standards out for review
• A better OpenCL
• Better debug, HSAIL
QUALITIES IN A CANDIDATE
• Task parallelism
• Break up task over threads
• Data parallelism
• Same operation over lots of data
• Big 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 - map reduce
• HipHop?
LIBJPEG
• Software, NEON, OpenCL comparison possible
• Android & 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 1.6-2x improvement
• Used jocl (java bindings for OpenCL)
• Source?
PIGLIT
• Mesa test suite
• Includes a number of OpenCL tests
• Should 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?

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LCA13: Exploiting ARM GPU resources in Open Source Software

  • 1. GPGPU ON ARM Tom Gall tom.gall@linaro.org
  • 2. SESSION GOALS • What activity should Linaro pursue? • What open source projects should we work with?
  • 3. BOUNDARIES • Lets not do any PHD dissertations • Output must be open source • Optimized stack should of course advance member goals
  • 5. OPEN CL • Originally proposed by Apple • API for using your resources including the GPU as a general purpose power house • Khronos standard (holders of OpenGL) • Open Compute Language • ANSI-C99 w additions • Open = anyone can implement
  • 6. HSA • Heterogeneous System Architecture • hsafoundation.com • HSA standards out for review • A better OpenCL • Better debug, HSAIL
  • 7. QUALITIES IN A CANDIDATE • Task parallelism • Break up task over threads • Data parallelism • Same operation over lots of data • Big wins for computationally significant data parallel algs • Bad • Lots of pointer chasing • Calculations that require lots of communication or result dependent
  • 8. PROJECTS • Libjpeg vs libjpeg turbo • SQLite • Hadoop - map reduce • HipHop?
  • 9. LIBJPEG • Software, NEON, OpenCL comparison possible • Android & Linux • code.google.com/p/jpeg-opencl/source/checkout
  • 10. 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
  • 11. HADOOP • MapReduce is a major piece of Hadoop • http://ieeexplore.ieee.org/xpl/articleDetails.jsp? reload=true&arnumber=6227786 • Measured 1.6-2x improvement • Used jocl (java bindings for OpenCL) • Source?
  • 12. PIGLIT • Mesa test suite • Includes a number of OpenCL tests • Should be fairly straight forward to add to LAVA • Linux • Android
  • 13. GRAND CENTRAL • libdispatch - open source • http://libdispatch.macosforge.org • Can go hand in hand with OpenCL • Needs llvm, libkqueue, blocks runtime
  • 14. MORE?