Few Workspace tweaks (#409)

* Allow to destroy workspaces on demand

Signed-off-by: raver119 <raver119@gmail.com>

* MMAP'd workspace can't have LearningPolicy

Signed-off-by: raver119 <raver119@gmail.com>

* throw an exception on CUDA

Signed-off-by: raver119 <raver119@gmail.com>

libnd4j/include/helpers/mman.h

@@ -138,13 +138,6 @@ void _mmap(Nd4jLong* result, size_t length, const char *fileName) {
     OffsetType off  = 0;
     int prot = PROT_READ | PROT_WRITE;
 
-    // we need to convert long path (probably) to short pat (actually)
-    // it's Windows API, in the middle of 2018!
-    auto sz = GetShortPathName(fileName, nullptr, 0);
-
-    auto shortName = new TCHAR[sz];
-    GetShortPathName(fileName, shortName, sz);
-
 #ifdef _MSC_VER
     #pragma warning(push)
     #pragma warning(disable: 4293)
@@ -170,8 +163,6 @@ void _mmap(Nd4jLong* result, size_t length, const char *fileName) {
 
     h = CreateFileA(fileName, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_WRITE | FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
 
-    delete[] shortName;
-
     if (h == INVALID_HANDLE_VALUE) {
         errno = __map_mman_error(GetLastError(), EPERM);
         nd4j_printf("Error code: %i\n", (int) errno);

nd4j/nd4j-backends/nd4j-api-parent/nd4j-api/src/main/java/org/nd4j/linalg/api/memory/abstracts/Nd4jWorkspace.java

@@ -297,6 +297,10 @@ public abstract class Nd4jWorkspace implements MemoryWorkspace {
     }
 
     protected void init() {
+        // in case of MMAP we don't want any learning applied
+        if (workspaceConfiguration.getPolicyLocation() == LocationPolicy.MMAP && workspaceConfiguration.getPolicyLearning() != LearningPolicy.NONE)
+            throw new IllegalArgumentException("Workspace backed by memory-mapped file can't have LearningPolicy defined");
+
         // we don't want overallocation in case of MMAP
         if (currentSize.get() > 0 && workspaceConfiguration.getPolicyLocation() != LocationPolicy.MMAP) {
             if (!isOver.get()) {
@@ -309,7 +313,6 @@ public abstract class Nd4jWorkspace implements MemoryWorkspace {
 
             if (workspaceConfiguration.getMaxSize() > 0 && currentSize.get() > workspaceConfiguration.getMaxSize())
                 currentSize.set(workspaceConfiguration.getMaxSize());
-
         }
     }
 

nd4j/nd4j-backends/nd4j-api-parent/nd4j-api/src/main/java/org/nd4j/linalg/api/memory/provider/BasicWorkspaceManager.java

@@ -159,7 +159,7 @@ public abstract class BasicWorkspaceManager implements MemoryWorkspaceManager {
         if (workspace == null || workspace instanceof DummyWorkspace)
             return;
 
-        //workspace.destroyWorkspace();
+        workspace.destroyWorkspace(true);
         backingMap.get().remove(workspace.getId());
     }
 

nd4j/nd4j-backends/nd4j-backend-impls/nd4j-native/src/main/java/org/nd4j/linalg/cpu/nativecpu/workspace/CpuWorkspace.java

@@ -138,6 +138,13 @@ public class CpuWorkspace extends Nd4jWorkspace implements Deallocatable {
         }
     }
 
+    protected long mappedFileSize() {
+        if (workspaceConfiguration.getPolicyLocation() != LocationPolicy.MMAP)
+            return 0;
+
+        return tempFile.length();
+    }
+
     @Override
     protected void clearExternalAllocations() {
         if (isDebug.get())

nd4j/nd4j-backends/nd4j-backend-impls/nd4j-native/src/main/java/org/nd4j/linalg/cpu/nativecpu/workspace/CpuWorkspaceDeallocator.java

@@ -18,11 +18,15 @@ package org.nd4j.linalg.cpu.nativecpu.workspace;
 
 import lombok.NonNull;
 import lombok.extern.slf4j.Slf4j;
+import org.bytedeco.javacpp.LongPointer;
+import org.bytedeco.javacpp.Pointer;
 import org.nd4j.linalg.api.memory.Deallocator;
 import org.nd4j.linalg.api.memory.enums.LocationPolicy;
 import org.nd4j.linalg.api.memory.enums.MemoryKind;
 import org.nd4j.linalg.api.memory.pointers.PointersPair;
 import org.nd4j.linalg.factory.Nd4j;
+import org.nd4j.linalg.primitives.Pair;
+import org.nd4j.nativeblas.NativeOpsHolder;
 
 import java.util.List;
 import java.util.Queue;
@@ -37,12 +41,16 @@ public class CpuWorkspaceDeallocator implements Deallocator {
     private Queue<PointersPair> pinnedPointers;
     private List<PointersPair> externalPointers;
     private LocationPolicy location;
+    private Pair<LongPointer, Long> mmapInfo;
 
     public CpuWorkspaceDeallocator(@NonNull CpuWorkspace workspace) {
         this.pointersPair = workspace.workspace();
         this.pinnedPointers = workspace.pinnedPointers();
         this.externalPointers = workspace.externalPointers();
         this.location = workspace.getWorkspaceConfiguration().getPolicyLocation();
+
+        if (workspace.mappedFileSize() > 0)
+            this.mmapInfo = Pair.makePair(workspace.mmap, workspace.mappedFileSize());
     }
 
     @Override
@@ -50,7 +58,7 @@ public class CpuWorkspaceDeallocator implements Deallocator {
         log.trace("Deallocating CPU workspace");
 
         // purging workspace planes
-        if (pointersPair != null) {
+        if (pointersPair != null && (pointersPair.getDevicePointer() != null || pointersPair.getHostPointer() != null)) {
             if (pointersPair.getDevicePointer() != null) {
                 Nd4j.getMemoryManager().release(pointersPair.getDevicePointer(), MemoryKind.DEVICE);
             }
@@ -58,6 +66,8 @@ public class CpuWorkspaceDeallocator implements Deallocator {
             if (pointersPair.getHostPointer() != null) {
                 if (location != LocationPolicy.MMAP)
                     Nd4j.getMemoryManager().release(pointersPair.getHostPointer(), MemoryKind.HOST);
+                else
+                    NativeOpsHolder.getInstance().getDeviceNativeOps().munmapFile(null, mmapInfo.getFirst(), mmapInfo.getSecond());
             }
         }
 

nd4j/nd4j-backends/nd4j-tests/src/test/java/org/nd4j/linalg/workspace/BasicWorkspaceTests.java

@@ -930,6 +930,7 @@ public class BasicWorkspaceTests extends BaseNd4jTest {
         WorkspaceConfiguration mmap = WorkspaceConfiguration.builder()
                 .initialSize(1000000)
                 .policyLocation(LocationPolicy.MMAP)
+                .policyLearning(LearningPolicy.NONE)
                 .build();
 
         MemoryWorkspace ws = Nd4j.getWorkspaceManager().getAndActivateWorkspace(mmap, "M2");

nd4j/nd4j-backends/nd4j-tests/src/test/java/org/nd4j/linalg/workspace/SpecialWorkspaceTests.java

@@ -344,6 +344,7 @@ public class SpecialWorkspaceTests extends BaseNd4jTest {
                 .initialSize(200 * 1024L * 1024L) // 200mbs
                 .tempFilePath(tmpFile.toAbsolutePath().toString())
                 .policyLocation(LocationPolicy.MMAP)
+                .policyLearning(LearningPolicy.NONE)
                 .build();
 
         try (val ws = Nd4j.getWorkspaceManager().getAndActivateWorkspace(mmap, "M2")) {
@@ -373,6 +374,7 @@ public class SpecialWorkspaceTests extends BaseNd4jTest {
                 .initialSize(200 * 1024L * 1024L) // 200mbs
                 .tempFilePath(tmpFile.toAbsolutePath().toString())
                 .policyLocation(LocationPolicy.MMAP)
+                .policyLearning(LearningPolicy.NONE)
                 .build();
 
         try (val ws = Nd4j.getWorkspaceManager().getAndActivateWorkspace(mmap, "M2")) {
@@ -380,6 +382,49 @@ public class SpecialWorkspaceTests extends BaseNd4jTest {
         }
     }
 
+    @Test
+    public void testDeleteMappedFile_1() throws Exception {
+        if (!Nd4j.getEnvironment().isCPU())
+            return;
+
+        val tmpFile = Files.createTempFile("some", "file");
+        val mmap = WorkspaceConfiguration.builder()
+                .initialSize(200 * 1024L * 1024L) // 200mbs
+                .tempFilePath(tmpFile.toAbsolutePath().toString())
+                .policyLocation(LocationPolicy.MMAP)
+                .policyLearning(LearningPolicy.NONE)
+                .build();
+
+        try (val ws = Nd4j.getWorkspaceManager().getAndActivateWorkspace(mmap, "M2")) {
+            val x = Nd4j.rand(DataType.FLOAT, 1024);
+        }
+
+        Nd4j.getWorkspaceManager().destroyAllWorkspacesForCurrentThread();
+
+        Files.delete(tmpFile);
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void testDeleteMappedFile_2() throws Exception {
+        if (!Nd4j.getEnvironment().isCPU())
+            throw new IllegalArgumentException("Don't try to run on CUDA");
+
+        val tmpFile = Files.createTempFile("some", "file");
+        val mmap = WorkspaceConfiguration.builder()
+                .initialSize(200 * 1024L * 1024L) // 200mbs
+                .tempFilePath(tmpFile.toAbsolutePath().toString())
+                .policyLocation(LocationPolicy.MMAP)
+                .build();
+
+        try (val ws = Nd4j.getWorkspaceManager().getAndActivateWorkspace(mmap, "M2")) {
+            val x = Nd4j.rand(DataType.FLOAT, 1024);
+        }
+
+        Nd4j.getWorkspaceManager().destroyAllWorkspacesForCurrentThread();
+
+        Files.delete(tmpFile);
+    }
+
     @Override
     public char ordering() {
         return 'c';