private CudaEngine(final int deviceId) {
exe = Executors.newSingleThreadExecutor(); // mandatory: Only one cuda thread per context
Id = deviceId;
try {
exe.submit(
new Runnable() {
@Override
public void run() {
CUdevice device = new CUdevice();
JCudaDriver.cuDeviceGet(device, deviceId);
int array[] = {0};
JCudaDriver.cuDeviceGetAttribute(
array, CU_DEVICE_ATTRIBUTE_MAX_THREADS_PER_BLOCK, device);
maxThreads = (int) Math.sqrt(array[0]);
context = new CUcontext();
// JCudaDriver.cuCtxCreate(context, CUctx_flags.CU_CTX_SCHED_BLOCKING_SYNC,
// device);
JCudaDriver.cuCtxCreate(context, 0, device);
CUmodule m = new CUmodule();
initModules(m);
for (Kernel k : Kernel.values()) {
initFunction(m, k);
}
// JCudaDriver.cuCtxSetCacheConfig(CUfunc_cache.CU_FUNC_CACHE_PREFER_NONE);>
//
// JCudaDriver.cuCtxSetSharedMemConfig(CUsharedconfig.CU_SHARED_MEM_CONFIG_EIGHT_BYTE_BANK_SIZE);
}
})
.get();
} catch (InterruptedException | ExecutionException e) {
throw new RuntimeException(e.getMessage());
}
neigborsPtrs = new HashMap<>();
}
public static void start() {
if (started) return;
// start code
pool = Executors.newFixedThreadPool(poolSize);
System.out.println("downloader start!!");
for (DownloadTask task : tasks) pool.execute(task);
started = true;
}
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;
}
}
public class FileDescLoader {
private static final Logger log = LoggerFactory.getLogger(FileDescLoader.class);
private static final ExecutorService exec = Executors.newCachedThreadPool();
public static void load(Collection<FileDesc> files, Path root, int blocSize, Pattern pattern)
throws IOException {
root = root.toAbsolutePath().normalize();
Visitor visitor = new Visitor(root, blocSize, pattern);
Files.walkFileTree(root, visitor);
for (Future<FileDesc> future : visitor.futures()) {
try {
files.add(future.get());
} catch (Exception e) {
log.error("", e);
}
}
}
/** @return matching bloc B bloc -> A bloc */
public static Map<Integer, Integer> diff(FileDesc a, FileDesc b) {
Map<Integer, List<IndexedHash>> blocA = new HashMap<Integer, List<IndexedHash>>();
int i = 0;
for (Bloc bloc : a.blocs) {
List<IndexedHash> l = blocA.get(bloc.roll);
if (l == null) {
l = new ArrayList<IndexedHash>();
blocA.put(bloc.roll, l);
}
l.add(new IndexedHash(i++, bloc.hash));
}
Map<Integer, Integer> map = new HashMap<Integer, Integer>();
loop:
for (i = 0; i < b.blocs.length; i++) {
Bloc blocB = b.blocs[i];
List<IndexedHash> list = blocA.get(blocB.roll);
if (list != null) {
for (IndexedHash bloc : list) {
if (blocB.hash.equals(bloc.h)) {
map.put(i, bloc.i);
continue loop;
}
}
}
}
return map;
}
public static FileDesc loadFile(Path root, Path file, int blocSize)
throws NoSuchAlgorithmException, FileNotFoundException, IOException {
MessageDigest md = MessageDigest.getInstance("SHA-512");
MessageDigest fileMd = MessageDigest.getInstance("SHA-512");
FileDesc desc = new FileDesc(file.toString(), null, null);
List<Bloc> list = new ArrayList<Bloc>();
try (FileInputStream fis = new FileInputStream(root.resolve(file).toString())) {
byte[] buf = new byte[blocSize];
byte[] h;
int s;
while ((s = fis.read(buf)) != -1) {
int c;
while (s < buf.length && (c = fis.read()) != -1) buf[s++] = (byte) c;
fileMd.update(buf, 0, s);
// padding
byte p = 0;
while (s < buf.length) buf[s++] = ++p;
h = md.digest(buf);
Bloc bloc = new Bloc(RollingChecksum.compute(buf), new Hash(h));
list.add(bloc);
}
h = fileMd.digest();
desc.fileHash = new Hash(h);
desc.blocs = list.toArray(new Bloc[0]);
}
return desc;
}
private static class Visitor implements FileVisitor<Path> {
private Path root;
private int blocSize;
private Matcher m;
private List<Future<FileDesc>> futures = new ArrayList<>();
public Visitor(Path root, int blocFile, Pattern pattern) {
this.root = root;
this.blocSize = blocFile;
this.m = pattern == null ? null : pattern.matcher("");
}
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs)
throws IOException {
if (m != null) m.reset(root.relativize(dir).toString());
return m == null || m.matches() || m.hitEnd()
? FileVisitResult.CONTINUE
: FileVisitResult.SKIP_SUBTREE;
}
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
if (attrs.isRegularFile()) {
if (m != null) m.reset(root.relativize(file).toString());
if (m == null || m.matches())
futures.add(exec.submit(new FileLoader(root, file, blocSize)));
}
return FileVisitResult.CONTINUE;
}
public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
return FileVisitResult.CONTINUE;
}
public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
return FileVisitResult.CONTINUE;
}
public List<Future<FileDesc>> futures() {
return futures;
}
}
private static class FileLoader implements Callable<FileDesc> {
private Path file;
private int blocSize;
private Path root;
public FileLoader(Path root, Path file, int blocSize) throws IOException {
this.root = root;
this.file = file;
this.blocSize = blocSize;
}
public FileDesc call() throws Exception {
return loadFile(root, root.relativize(file), blocSize);
}
}
public static class IndexedHash {
public int i;
public Hash h;
public IndexedHash(int i, Hash h) {
this.i = i;
this.h = h;
}
}
}
