JavaCLTutorial.java
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package org.testcl;
import static java.lang.Math.cos;
import static java.lang.Math.sin;
import static org.bridj.Pointer.allocateFloats;
import java.io.IOException;
import java.nio.ByteOrder;
import org.bridj.Pointer;
import com.nativelibs4java.opencl.CLBuffer;
import com.nativelibs4java.opencl.CLContext;
import com.nativelibs4java.opencl.CLEvent;
import com.nativelibs4java.opencl.CLKernel;
import com.nativelibs4java.opencl.CLMem.Usage;
import com.nativelibs4java.opencl.CLProgram;
import com.nativelibs4java.opencl.CLQueue;
import com.nativelibs4java.opencl.JavaCL;
import com.nativelibs4java.util.IOUtils;
public class JavaCLTutorial {
public static void main(String[] args) throws IOException {
CLContext context = JavaCL.createBestContext();
CLQueue queue = context.createDefaultQueue();
ByteOrder byteOrder = context.getByteOrder();
int n = 1024;
Pointer<Float>
aPtr = allocateFloats(n).order(byteOrder),
bPtr = allocateFloats(n).order(byteOrder);
for (int i = 0; i < n; i++) {
aPtr.set(i, (float)cos(i));
bPtr.set(i, (float)sin(i));
}
// Create OpenCL input buffers (using the native memory pointers aPtr and bPtr) :
CLBuffer<Float>
a = context.createBuffer(Usage.Input, aPtr),
b = context.createBuffer(Usage.Input, bPtr);
// Create an OpenCL output buffer :
CLBuffer<Float> out = context.createFloatBuffer(Usage.Output, n);
// Read the program sources and compile them :
String src = IOUtils.readText(JavaCLTutorial.class.getResource("TutorialKernels.cl"));
CLProgram program = context.createProgram(src);
// Get and call the kernel :
CLKernel addFloatsKernel = program.createKernel("add_floats");
addFloatsKernel.setArgs(a, b, out, n);
CLEvent addEvt = addFloatsKernel.enqueueNDRange(queue, new int[] { n });
Pointer<Float> outPtr = out.read(queue, addEvt); // blocks until add_floats finished
// Print the first 10 output values :
for (int i = 0; i < 10 && i < n; i++)
System.out.println("out[" + i + "] = " + outPtr.get(i));
}
}
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TutorialKernels.cl
__kernel void add_floats(__global const float* a, __global const float* b, __global float* out, int n)
{
int i = get_global_id(0);
if (i >= n)
return;
out = a + b;
}
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This is code from JavaCL tutorial. It uses javacl-1.0.0-RC3-shaded.jar library
CodeXL ignore all breakpoints and step/break button. I can see only Debugged process event list.
Kernel dispatched on GPU
