Accelerate little models

test=release/1.2

paddle/fluid/framework/CMakeLists.txt

@@ -80,7 +80,7 @@ cc_test(variable_test SRCS variable_test.cc)
 cc_library(threadpool SRCS threadpool.cc DEPS enforce)
 cc_test(threadpool_test SRCS threadpool_test.cc DEPS threadpool)
 
-cc_library(scope SRCS scope.cc DEPS glog threadpool)
+cc_library(scope SRCS scope.cc DEPS glog threadpool xxhash)
 cc_test(scope_test SRCS scope_test.cc DEPS scope)
 
 cc_library(data_device_transform SRCS data_device_transform.cc DEPS tensor)

paddle/fluid/framework/details/execution_strategy.h

@@ -25,7 +25,7 @@ struct ExecutionStrategy {
   size_t num_threads_{0};
   bool use_cuda_{true};
   bool allow_op_delay_{false};
-  size_t num_iteration_per_drop_scope_{100};
+  size_t num_iteration_per_drop_scope_{1};
   ExecutorType type_{kDefault};
   bool dry_run_{false};
 };

paddle/fluid/framework/details/scope_buffered_ssa_graph_executor.cc

@@ -67,35 +67,26 @@ FeedFetchList ScopeBufferedSSAGraphExecutor::Run(
   }
 
   platform::RecordEvent e("ScopeBufferedSSAGraphExecutorAfterRun", nullptr);
-  drop_scope_counter_ += 1;
+  ++drop_scope_counter_;
 
-#ifdef PADDLE_WITH_CUDA
-  const std::string gc_name = "garbage_collector";
-  DeviceGarbageCollectorMap *gc =
-      Graph().Has(gc_name) ? &(Graph().Get<DeviceGarbageCollectorMap>(gc_name))
-                           : nullptr;
-#endif
-
-  if (!fetch_tensors.empty() ||
-      drop_scope_counter_ == strategy_.num_iteration_per_drop_scope_) {
-    drop_scope_counter_ = 0;
-    // Wait All computational streams
-    for (auto p : places_) {
-      platform::DeviceContextPool::Instance().Get(p)->Wait();
-#ifdef PADDLE_WITH_CUDA
-      if (gc != nullptr && platform::is_gpu_place(p)) {
-        auto gpu_place = boost::get<platform::CUDAPlace>(p);
-        auto &gc_at_place = gc->at(gpu_place.device);
-        gc_at_place->Wait();
-        gc_at_place->Reset();
+  bool stream_end = false;
+  if (!fetch_tensors.empty()) {
+    WaitComputationalStreams();
+    stream_end = true;
   }
-#endif
+
+  if (drop_scope_counter_ == strategy_.num_iteration_per_drop_scope_) {
+    if (!stream_end) {
+      WaitComputationalStreams();
     }
+
     for (auto &scope : local_scopes_) {
       auto &local_scope =
           *scope->Var(details::kLocalExecScopeName)->GetMutable<Scope *>();
       scope->DeleteScope(local_scope);
     }
+
+    drop_scope_counter_ = 0;
   }
   if (eptr) {
     std::rethrow_exception(eptr);

paddle/fluid/framework/details/scope_buffered_ssa_graph_executor.h

@@ -47,6 +47,30 @@ class ScopeBufferedSSAGraphExecutor : public SSAGraphExecutor {
 
   FeedFetchList Run(const std::vector<std::string>& fetch_tensors) override;
 
+ private:
+  inline void WaitComputationalStreams() {
+#ifdef PADDLE_WITH_CUDA
+    const std::string gc_name = "garbage_collector";
+    DeviceGarbageCollectorMap* gc =
+        Graph().Has(gc_name)
+            ? &(Graph().Get<DeviceGarbageCollectorMap>(gc_name))
+            : nullptr;
+#endif
+
+    // Wait All computational streams
+    for (auto p : places_) {
+      platform::DeviceContextPool::Instance().Get(p)->Wait();
+#ifdef PADDLE_WITH_CUDA
+      if (gc != nullptr && platform::is_gpu_place(p)) {
+        auto gpu_place = boost::get<platform::CUDAPlace>(p);
+        auto& gc_at_place = gc->at(gpu_place.device);
+        gc_at_place->Wait();
+        gc_at_place->Reset();
+      }
+#endif
+    }
+  }
+
  private:
   size_t drop_scope_counter_{0};
 

paddle/fluid/framework/rw_lock.h

@@ -16,6 +16,8 @@ limitations under the License. */
 
 #if !defined(_WIN32)
 #include <pthread.h>
+#else
+#include <mutex>  // NOLINT
 #endif            // !_WIN32
 
 #include "paddle/fluid/platform/enforce.h"
@@ -29,17 +31,17 @@ struct RWLock {
 
   ~RWLock() { pthread_rwlock_destroy(&lock_); }
 
-  void RDLock() {
+  inline void RDLock() {
     PADDLE_ENFORCE_EQ(pthread_rwlock_rdlock(&lock_), 0,
                       "acquire read lock failed");
   }
 
-  void WRLock() {
+  inline void WRLock() {
     PADDLE_ENFORCE_EQ(pthread_rwlock_wrlock(&lock_), 0,
                       "acquire write lock failed");
   }
 
-  void UNLock() {
+  inline void UNLock() {
     PADDLE_ENFORCE_EQ(pthread_rwlock_unlock(&lock_), 0, "unlock failed");
   }
 
@@ -51,81 +53,46 @@ struct RWLock {
 // https://stackoverflow.com/questions/7125250/making-pthread-rwlock-wrlock-recursive
 // In windows, rw_lock seems like a hack. Use empty object and do nothing.
 struct RWLock {
-  void RDLock() {}
-  void WRLock() {}
-  void UNLock() {}
+  // FIXME(minqiyang): use mutex here to do fake lock
+  inline void RDLock() { mutex_.lock(); }
+
+  inline void WRLock() { mutex_.lock(); }
+
+  inline void UNLock() { mutex_.unlock(); }
+
+ private:
+  std::mutex mutex_;
 };
 #endif
 
-class RWLockGuard {
+class AutoWRLock {
  public:
-  enum Status { kUnLock, kWRLock, kRDLock };
-
-  RWLockGuard(RWLock* rw_lock, Status init_status)
-      : lock_(rw_lock), status_(Status::kUnLock) {
-    switch (init_status) {
-      case Status::kRDLock: {
-        RDLock();
-        break;
-      }
-      case Status::kWRLock: {
-        WRLock();
-        break;
-      }
-      case Status::kUnLock: {
-        break;
-      }
-    }
-  }
+  explicit AutoWRLock(RWLock* rw_lock) : lock_(rw_lock) { Lock(); }
 
-  void WRLock() {
-    switch (status_) {
-      case Status::kUnLock: {
-        lock_->WRLock();
-        status_ = Status::kWRLock;
-        break;
-      }
-      case Status::kWRLock: {
-        break;
-      }
-      case Status::kRDLock: {
-        PADDLE_THROW(
-            "Please unlock read lock first before invoking write lock.");
-        break;
-      }
-    }
-  }
+  ~AutoWRLock() { UnLock(); }
 
-  void RDLock() {
-    switch (status_) {
-      case Status::kUnLock: {
-        lock_->RDLock();
-        status_ = Status::kRDLock;
-        break;
-      }
-      case Status::kRDLock: {
-        break;
-      }
-      case Status::kWRLock: {
-        PADDLE_THROW(
-            "Please unlock write lock first before invoking read lock.");
-        break;
-      }
-    }
-  }
+ private:
+  inline void Lock() { lock_->WRLock(); }
 
-  void UnLock() {
-    if (status_ != Status::kUnLock) {
-      lock_->UNLock();
-      status_ = Status::kUnLock;
-    }
-  }
+  inline void UnLock() { lock_->UNLock(); }
+
+ private:
+  RWLock* lock_;
+};
+
+class AutoRDLock {
+ public:
+  explicit AutoRDLock(RWLock* rw_lock) : lock_(rw_lock) { Lock(); }
+
+  ~AutoRDLock() { UnLock(); }
+
+ private:
+  inline void Lock() { lock_->RDLock(); }
 
-  ~RWLockGuard() { UnLock(); }
+  inline void UnLock() { lock_->UNLock(); }
 
  private:
   RWLock* lock_;
-  Status status_;
 };
 
 }  // namespace framework

paddle/fluid/framework/scope.cc

@@ -43,9 +43,15 @@ DEFINE_double(
 // the mutex will cause serious performance issue.
 // So the mutex is disabled when `ON_INFER`.
 #ifdef PADDLE_ON_INFERENCE
-#define SCOPE_LOCK_GUARD
+#define SCOPE_KIDS_READER_LOCK
+#define SCOPE_KIDS_WRITER_LOCK
+#define SCOPE_VARS_READER_LOCK
+#define SCOPE_VARS_WRITER_LOCK
 #else
-#define SCOPE_LOCK_GUARD std::lock_guard<std::mutex> lock(mutex_);
+#define SCOPE_KIDS_READER_LOCK AutoRDLock auto_lock(&kids_lock_);
+#define SCOPE_KIDS_WRITER_LOCK AutoWRLock auto_lock(&kids_lock_);
+#define SCOPE_VARS_READER_LOCK AutoRDLock auto_lock(&vars_lock_);
+#define SCOPE_VARS_WRITER_LOCK AutoWRLock auto_lock(&vars_lock_);
 #endif
 
 namespace paddle {
@@ -61,64 +67,69 @@ int64_t GetEagerDeletionThreshold() {
 Scope::~Scope() { DropKids(); }
 
 Scope& Scope::NewScope() const {
-  SCOPE_LOCK_GUARD
-  kids_.push_back(new Scope(this));
-  return *kids_.back();
+  Scope* child = new Scope(this);
+  {
+    SCOPE_KIDS_WRITER_LOCK
+    kids_.push_back(child);
+  }
+  return *child;
 }
 
 Variable* Scope::Var(const std::string& name) {
-  SCOPE_LOCK_GUARD
+  SCOPE_VARS_WRITER_LOCK
   return VarInternal(name);
 }
 
 Variable* Scope::Var(std::string* name) {
-  SCOPE_LOCK_GUARD
   auto new_name = string::Sprintf("%p.%d", this, vars_.size());
   if (name != nullptr) {
     *name = new_name;
   }
+  SCOPE_VARS_WRITER_LOCK
   return VarInternal(new_name);
 }
 
 Variable* Scope::FindVar(const std::string& name) const {
-  SCOPE_LOCK_GUARD
+  SCOPE_VARS_READER_LOCK
   return FindVarInternal(name);
 }
 
 Variable* Scope::FindLocalVar(const std::string& name) const {
-  SCOPE_LOCK_GUARD
+  SCOPE_VARS_READER_LOCK
   return FindVarLocally(name);
 }
 
 const Scope* Scope::FindScope(const Variable* var) const {
-  SCOPE_LOCK_GUARD
+  SCOPE_VARS_READER_LOCK
   return FindScopeInternal(var);
 }
 
 void Scope::DropKids() {
-  SCOPE_LOCK_GUARD
+  SCOPE_KIDS_WRITER_LOCK
   for (Scope* s : kids_) delete s;
   kids_.clear();
 }
 
 bool Scope::HasKid(const Scope* scope) const {
-  SCOPE_LOCK_GUARD
+  SCOPE_KIDS_READER_LOCK
   auto it = std::find(this->kids_.begin(), this->kids_.end(), scope);
   return it != this->kids_.end();
 }
 
 std::vector<std::string> Scope::LocalVarNames() const {
-  SCOPE_LOCK_GUARD
   std::vector<std::string> known_vars;
+  {
+    SCOPE_VARS_READER_LOCK
     known_vars.reserve(this->vars_.size());
     for (auto& p : vars_) {
       known_vars.emplace_back(p.first);
     }
+  }
   return known_vars;
 }
 
 void Scope::DeleteScope(Scope* scope) const {
-  SCOPE_LOCK_GUARD
+  SCOPE_KIDS_WRITER_LOCK
   auto it = std::find(this->kids_.begin(), this->kids_.end(), scope);
   PADDLE_ENFORCE(it != this->kids_.end(), "%p Cannot find %p as kid scope",
                  this, scope);
@@ -132,8 +143,8 @@ void Scope::DeleteScope(Scope* scope) const {
 }
 
 void Scope::EraseVars(const std::vector<std::string>& var_names) {
-  SCOPE_LOCK_GUARD
   std::set<std::string> var_set(var_names.begin(), var_names.end());
+  SCOPE_VARS_WRITER_LOCK
   for (auto it = vars_.begin(); it != vars_.end();) {
     if (var_set.find(it->first) != var_set.end()) {
       it = vars_.erase(it);
@@ -145,12 +156,12 @@ void Scope::EraseVars(const std::vector<std::string>& var_names) {
 
 void Scope::Rename(const std::string& origin_name,
                    const std::string& new_name) const {
-  SCOPE_LOCK_GUARD
+  SCOPE_VARS_WRITER_LOCK
   RenameInternal(origin_name, new_name);
 }
 
 std::string Scope::Rename(const std::string& origin_name) const {
-  SCOPE_LOCK_GUARD
+  SCOPE_VARS_WRITER_LOCK
   auto new_name = string::Sprintf("%p.%d", this, vars_.size());
   RenameInternal(origin_name, new_name);
   return new_name;

paddle/fluid/framework/scope.h

@@ -14,12 +14,18 @@ limitations under the License. */
 
 #pragma once
 
+extern "C" {
+#include <xxhash.h>
+}
+
 #include <list>
-#include <mutex>  // NOLINT
+#include <memory>
 #include <string>
 #include <unordered_map>
+#include <utility>
 #include <vector>
 
+#include "paddle/fluid/framework/rw_lock.h"
 #include "paddle/fluid/framework/variable.h"
 #include "paddle/fluid/platform/macros.h"
 
@@ -94,7 +100,14 @@ class Scope {
   std::string Rename(const std::string& origin_name) const;
 
  protected:
-  mutable std::unordered_map<std::string, std::unique_ptr<Variable>> vars_;
+  struct KeyHasher {
+    std::size_t operator()(const std::string& key) const {
+      return XXH32(key.c_str(), key.size(), 1);
+    }
+  };
+
+  mutable std::unordered_map<std::string, std::unique_ptr<Variable>, KeyHasher>
+      vars_;
 
  private:
   // Call Scope::NewScope for a sub-scope.
@@ -123,7 +136,8 @@ class Scope {
   DISABLE_COPY_AND_ASSIGN(Scope);
 
  private:
-  mutable std::mutex mutex_;
+  mutable RWLock kids_lock_;
+  mutable RWLock vars_lock_;
 };
 
 // Generate some debug string about the inherience structure of scope, quite