第5回SCDN - Ruby Summer of Code: NArray on OpenCL

Ruby Summer of Code: NArray on OpenCL Kazu @ktanimur https://github.com/kazuyukitanimura

Who is @ktanimur
Ph.D. Student in computer science at UC Irvine
Research
Embedded Systems / CAD / Security
Programing Languages
Ruby+OpenCL
Today's topic
JavaScript (Node.js)
Designo: twitter client
Demo: designo.pictshare.me
Code: https://github.com/kazuyukitanimura
Verilog-HDL, VHDL
C, C++
etc...

Electric Design Automation
Source: EE Times

DAC 2011
Keynote:
Steve Wozniak
Fusion-io

Why Ruby?
One of my senpai is a rubyist
Ruby for making simulation framework of my research
Easy to make prototypes
Ruby != Rails
Ruby cannot handle muti-core CPUs
Wanted to contribute the Ruby community

2010 Summer
Ruby version of Google Summer of Code
Students propose projects
70 applicants
20 selected
3 mentors / student
$5,000 salary
Sponsored by Ruby communities

NArray
N-dimensional Numerical Array for Ruby
https://github.com/masa16/narray
Fixed-type data
sint, int, sloat, scomplex, float, complex
Fast !!
Loop in C
Applications
Dennou Ruby, etc...
Single Thread
Do not scale in the multicore era

OpenCL
Open Standard for parallel programming of heterogeneous systems by Khronos group
Similar to Nvidia CUDA
OpenCL is a specification, not a technology
Online & Offline compile
Hardware agnostic
CPU, GPU, ASIP, FPGA, etc...
AMD, Nvidia, Apple, Foxc
Intel started the OpenCL support recently

Proposed Project
NArray on OpenCL
Want to use Ruby with NArray
No need to worry about memory
It takes time to learn OpenCL
Need to worry about memory model
Main Idea: Translate NArray into OpenCL!!
Programmers can utilize the power of Multicore/GPU using Ruby
Why OpenCL?
Hardware agnostic
Exploit the available hardware e.g. GPU, CPU
pthread, OpenMP cannot run on GPU

Results
Mac mini mid 2010, CPU:Intel Core 2 Duo 2.4GHz, Memory:DDR3 1067MHz 2GB
Successfully received $5,000
https://github.com/kazuyukitanimura/narray/wiki
Original $ ruby bench/bench.rb scomplex atanh 1000000 1000 Ruby NArray type=scomplex size=1000000 op=atanh repeat=1000 Time: 98.95 sec OpenCL $ ruby bench/bench.rb scomplex atanh 1000000 1000 Ruby NArray type=scomplex size=1000000 op=atanh repeat=1000 Time: 42.46 sec

Future Work
Currently Multicore CPUs only
GPU Support is delayed
Explicit data transportation between main memory and GPU memory
Overhead
Applications
Hope: AMD Fusion (APU) and Intel's GPU in Sandy Bridge
Shared GPU/CPU memoery
Post an article to the Ruby Magazine

Q & A Thank you!

第5回SCDN - Ruby Summer of Code: NArray on OpenCL

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