diff --git a/common/clock.cuh b/common/clock.cuh
new file mode 100644
index 0000000..8b3b4eb
--- /dev/null
+++ b/common/clock.cuh
@@ -0,0 +1,33 @@
+#include <chrono>
+
+using namespace std::chrono;
+
+
+#define cudaClockStart                                                             \
+    float elapsed_time = 0;                                                        \
+    float curr_time = 0;                                                           \
+    cudaEvent_t start, stop;                                                       \
+    CHECK(cudaEventCreate(&start));                                                \
+    CHECK(cudaEventCreate(&stop));                                                 \
+    CHECK(cudaEventRecord(start));                                                 \
+    cudaEventQuery(start);                                                         \
+   
+   
+#define cudaClockCurr                                                              \
+    CHECK(cudaEventRecord(stop));                                                  \
+    CHECK(cudaEventSynchronize(stop));                                             \
+    CHECK(cudaEventElapsedTime(&curr_time, start, stop));                          \
+    printf("cuda time cost: %f ms.\n", curr_time - elapsed_time);                  \
+    elapsed_time = curr_time;                                                      \
+
+
+#define cppClockStart                                                              \
+    double t = 0;                                                                  \
+    auto tStart = system_clock::now();                                             \
+    auto tStop  = system_clock::now();                                             \
+
+
+#define cppClockCurr                                                               \
+    tStop = system_clock::now();                                                   \
+    t = duration<double, std::milli>(tStart - tStop).count();                      \
+    printf("cpp time cost: %f ms.\n", t);                                          \