Remove Pop method

paddle/fluid/framework/details/threaded_ssa_graph_executor.cc

@@ -125,7 +125,7 @@ FeedFetchList ThreadedSSAGraphExecutor::Run(
 
     // 2. Find ready variable
     bool timeout;
-    auto cur_ready_vars = ready_vars.PopAll(100, &timeout);
+    auto cur_ready_vars = ready_vars.PopAll(1000, &timeout);
 
     if (timeout) {
       if (exception_) {

paddle/fluid/framework/details/threaded_ssa_graph_executor.h

@@ -47,16 +47,6 @@ class BlockingQueue {
     cv_.notify_all();
   }
 
-  T Pop() {
-    std::unique_lock<std::mutex> lock(mutex_);
-    while (q_.empty()) {
-      cv_.wait(lock);
-    }
-    T v = q_.front();
-    q_.pop_front();
-    return v;
-  }
-
   std::deque<T> PopAll(size_t ms, bool *timeout) {
     auto time =
         std::chrono::system_clock::now() + std::chrono::milliseconds(ms);