add a PerfUtils.h

Author: hedaoyuan

paddle/math/tests/PerfUtils.h

@@ -0,0 +1,45 @@
+/* Copyright (c) 2016 Baidu, Inc. All Rights Reserve.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#pragma once
+
+// Performance Check
+#ifdef PADDLE_DISABLE_TIMER
+
+#define EXPRESSION_PERFORMANCE(expression) expression;
+
+#else
+
+#include "paddle/utils/Stat.h"
+
+#define EXPRESSION_PERFORMANCE(expression)                             \
+  do {                                                                 \
+    char expr[30];                                                     \
+    strncpy(expr, #expression, 30);                                    \
+    if (expr[29] != '\0') {                                            \
+      expr[27] = '.';                                                  \
+      expr[28] = '.';                                                  \
+      expr[29] = '\0';                                                 \
+    }                                                                  \
+    expression;                                                        \
+    for (int i = 0; i < 20; i++) {                                     \
+      REGISTER_TIMER(expr);                                            \
+      expression;                                                      \
+    }                                                                  \
+    LOG(INFO) << std::setiosflags(std::ios::left) << std::setfill(' ') \
+              << *globalStat.getStat(expr);                            \
+    globalStat.reset();                                                \
+  } while (0)
+
+#endif