static FloatBuffer getUnifiedFloatBuffer(Pointer pinnedMemory, CUdeviceptr devicePtr, long size) {
JCudaDriver.cuMemHostAlloc(pinnedMemory, size, JCudaDriver.CU_MEMHOSTALLOC_DEVICEMAP);
final ByteBuffer byteBuffer = pinnedMemory.getByteBuffer(0, size);
byteBuffer.order(ByteOrder.nativeOrder());
JCudaDriver.cuMemHostGetDevicePointer(devicePtr, pinnedMemory, 0);
return byteBuffer.asFloatBuffer();
}
public static int[] getUnifiedIntArray(Pointer pinnedMemory, CUdeviceptr devicePtr, int size) {
int[] values = new int[size];
JCudaDriver.cuMemHostAlloc(pinnedMemory, size, JCudaDriver.CU_MEMHOSTALLOC_DEVICEMAP);
final ByteBuffer byteBuffer = pinnedMemory.getByteBuffer(0, size);
byteBuffer.order(ByteOrder.nativeOrder());
JCudaDriver.cuMemHostGetDevicePointer(devicePtr, pinnedMemory, 0);
return values;
}
public static boolean init() {
synchronized (cudaEngines) {
System.err.println("---------Initializing Cuda----------------");
try {
extractAndLoadNativeLibs();
JCudaDriver.setExceptionsEnabled(true);
JCudaDriver.cuInit(0);
compileKernelsPtx();
// Obtain the number of devices
int deviceCountArray[] = {0};
JCudaDriver.cuDeviceGetCount(deviceCountArray);
availableDevicesNb = deviceCountArray[0];
if (availableDevicesNb == 0) return false;
availableDevicesNb = NB_OF_DEVICE_TO_USE; // TODO
initialization = Executors.newCachedThreadPool();
System.out.println("Found " + availableDevicesNb + " GPU devices");
for (int i = 0 /*-NB_OF_DEVICE_TO_USE*/; i < availableDevicesNb; i++) {
final int index = i;
Future<?> initJob =
initialization.submit(
new Runnable() {
public void run() {
System.err.println("Initializing device n°" + index);
cudaEngines.put(index, new CudaEngine(index));
}
});
initJob.get();
initialization.shutdown();
}
} catch (InterruptedException
| ExecutionException
| IOException
| CudaException
| UnsatisfiedLinkError e) {
e.printStackTrace();
System.err.println("---------Cannot initialize Cuda !!! ----------------");
return false;
}
Runtime.getRuntime()
.addShutdownHook(
new Thread() {
@Override
public void run() {
CudaEngine.stop();
}
});
System.out.println("---------Cuda Initialized----------------");
return true;
}
}
private void initFunction(CUmodule module, Kernel name) {
CUfunction function = new CUfunction();
JCudaDriver.cuModuleGetFunction(function, module, name.name());
kernels.put(name, function);
}
static void initModules(CUmodule module) {
JCudaDriver.cuModuleLoad(module, new File(ioTmpDir, PHEROMONES_CU + ".ptx").getAbsolutePath());
}
