Add cpu_timer.

nvbench/cpu_timer.cuh

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <chrono>
+
+namespace nvbench
+{
+
+struct cpu_timer
+{
+  cpu_timer() = default;
+
+  // move-only
+  cpu_timer(const cpu_timer &) = delete;
+  cpu_timer(cpu_timer &&)      = default;
+  cpu_timer &operator=(const cpu_timer &) = delete;
+  cpu_timer &operator=(cpu_timer &&) = default;
+
+  void start() { m_start = std::chrono::high_resolution_clock::now(); }
+
+  void stop() { m_stop = std::chrono::high_resolution_clock::now(); }
+
+  double get_duration()
+  {
+    const auto duration = m_stop - m_start;
+    const auto ns =
+      std::chrono::duration_cast<std::chrono::nanoseconds>(duration).count();
+    return ns * (1e-9);
+  }
+
+private:
+  std::chrono::high_resolution_clock::time_point m_start;
+  std::chrono::high_resolution_clock::time_point m_stop;
+};
+
+} // namespace nvbench

testing/CMakeLists.txt

@@ -2,6 +2,7 @@ set(test_srcs
   axes_metadata.cu
   benchmark.cu
   cuda_timer.cu
+  cpu_timer.cu
   float64_axis.cu
   int64_axis.cu
   params.cu

testing/cpu_timer.cu

@@ -0,0 +1,22 @@
+#include <nvbench/cpu_timer.cuh>
+
+#include "test_asserts.cuh"
+
+#include <chrono>
+#include <thread>
+
+void test_basic()
+{
+  using namespace std::literals::chrono_literals;
+
+  nvbench::cpu_timer timer;
+
+  timer.start();
+  std::this_thread::sleep_for(250ms);
+  timer.stop();
+
+  ASSERT(timer.get_duration() > 0.25);
+  ASSERT(timer.get_duration() < 0.50);
+}
+
+int main() { test_basic(); }