More Related Content Similar to これからのコンピューティングの変化とJava-JJUG CCC 2015 Fall Similar to これからのコンピューティングの変化とJava-JJUG CCC 2015 Fall (20) 18. FPGA
● Field Programmable Gate Array
– Field 現場で
– Programmable プログラム可能な
– Gate 論理素子が
– Array いっぱい並んだやつ
● 現場でプログラムできる論理回路
28. JavaでCPU(並列)
● Stream
int elementCount = 1_444_477;
float[] inputA = new float[elementCount];
float[] inputB = new float[elementCount];
float[] output = new float[elementCount];
IntStream.range(0, elementCount).parallel().forEach(i -> {
output[i] = inputA[i] * inputB[i];
});
29. JavaでGPU
● Aparapi
– JavaコードをOpenCLに変換
● OpenCLを呼び出す
– OpenCL:並列計算フレームワーク
● AMD始め、IntelやNVIDIAなどが参加
– JOCL(jogamp.org)
– JOCL(jocl.org)
– JavaCL
● Project Sumatra
– Stream処理を自動的にGPUで行う
– Java VMに組み込む
31. Aparapiコード
public class AparapiKernel extends Kernel{
float[] inputA;
float[] inputB;
float[] output;
@Override
public void run() {
int gid = getGlobalId();
output[gid] = inputA[gid] * inputB[gid];
}
public static void main(String[] args) {
AparapiKernel kernel = new AparapiKernel();
int elementCount = 1_444_477;
kernel.inputA = new float[elementCount];
kernel.inputB = new float[elementCount];
kernel.output = new float[elementCount];
fillBuffer(kernel.inputA);
fillBuffer(kernel.inputB);
kernel.execute(elementCount);
}
}
33. JOCLのコード
String KERNEL_CODE =
"kernel void add(global const float* inputA,"
+ " global const float* inputB,"
+ " global float* output,"
+ " uint numElements){"
+ " size_t gid = get_global_id(0);"
+ " if(gid >= numElements){"
+ " return;"
+ " }"
+ " output[gid] = inputA[gid] + inputB[gid];"
+ "}";
CLContext ctx = CLContext.create();
CLDevice device = ctx.getMaxFlopsDevice();
CLCommandQueue queue = device.createCommandQueue();
CLProgram program = ctx.createProgram(KERNEL_CODE).build();
int elementCount = 1_444_477;
int localWorkSize = Math.min(device.getMaxWorkGroupSize(), 256);
int globalWorkSize = ((elementCount + localWorkSize - 1) /
localWorkSize) * localWorkSize;
CLBuffer<FloatBuffer> clBufferA = ctx.createFloatBuffer(
elementCount, CLMemory.Mem.READ_ONLY);
CLBuffer<FloatBuffer> clBufferB = ctx.createFloatBuffer(
elementCount, CLMemory.Mem.READ_ONLY);
CLBuffer<FloatBuffer> clBufferC = ctx.createFloatBuffer(
elementCount, CLMemory.Mem.READ_WRITE);
fillBuffer(clBufferA.getBuffer());
fillBuffer(clBufferB.getBuffer());
CLKernel kernel = program.createCLKernel("add");
kernel
.putArgs(clBufferA, clBufferB, clBufferC)
.putArg(elementCount);
queue.putWriteBuffer(clBufferA, false)
.putWriteBuffer(clBufferB, false)
.put1DRangeKernel(kernel, 0, globalWorkSize, localWorkSize)
.putReadBuffer(clBufferC, true);
43. と思ったら
● 「Sumatra is not in active development for
now.(2015/5/1) 」
http://mail.openjdk.java.net/pipermail/sumatra-dev/2015-May/000310.html
45. Synthesijer
● みよしさんが作ってるオープンソース
http://synthesijer.github.io/web/
public class Test {
public boolean flag;
private int count;
public void run(){
while(true){
count++;
if(count > 5_000_000){
count = 0;
flag = !flag;
}
}
}
}
@synthesijerhdl
public class Top {
private final Test test = new Test();
@auto
public boolean flag(){
return test.flag;
}
@auto
public void main(){
test.run();
}
}
46. Synthesijerが出力したコード
module Test
(
input clk,
input reset,
input flag_in,
input flag_we,
output flag_out,
output run_busy,
input run_req
);
wire clk_sig;
wire reset_sig;
wire flag_in_sig;
wire flag_we_sig;
wire flag_out_sig;
reg run_busy_sig = 1'b1;
wire run_req_sig;
reg class_flag_0000 = 1'b0;
wire class_flag_0000_mux;
wire tmp_0001;
reg signed [32-1 : 0] class_count_0001 = 0;
reg signed [32-1 : 0] unary_expr_00005 = 0;
reg binary_expr_00007 = 1'b0;
reg unary_expr_00011 = 1'b0;
wire run_req_flag;
reg run_req_local = 1'b0;
wire tmp_0002;
localparam run_method_IDLE = 32'd0;
localparam run_method_S_0000 = 32'd1;
localparam run_method_S_0001 = 32'd2;
localparam run_method_S_0002 = 32'd3;
localparam run_method_S_0003 = 32'd4;
localparam run_method_S_0004 = 32'd5;
すごく長い
54. Unsafeの代替
利用例 代替
並列化プリミティブ JEP 193 Variable Handles
シリアライズ JEP 187 Serialization
メモリ管理 Project Panama
Project Valhalla
Arrays 2.0
JVM外とのやりとり Project Panama
JEP 191 FFI
82. 既存コードは省略形
● iload → vload :I
● daload → vaload :D
– さらにinvokeinterface Array.getElementの略に
できるかも！
83. Arrays 2.0
● 配列をインターフェイスに！
public interface Array<any X extends Ordinal, any E> {
X arrayLength();
E getElement(X n);
void setElement(X n, E e);
Array<X,E> clone();
Array<X,E> freeze();
Array<X,E> slice(X from, X to); // creates shared view
Array<X,E> copyOf(X length); // Arrays.copyOf
Array<X,E> copyOfRange(X from, X to); // Arrays.copyOfRange
boolean arrayEquals(Array<E> that); // Arrays.equals
int arrayHashCode(); // Arrays.hashCode
String arrayToString(); // Arrays.toString
85. という夢をみました
● Java VM Language Summit 2015
http://www.oracle.com/technetwork/java/javase/community/jlssessions-2015-2633029.html
