feat update benchmark

tile/fiber/detail/fiber_benchmark.cc

@@ -1,3 +1,4 @@
+#include "tile/base/chrono.h"
 #include "tile/base/random.h"
 #include "tile/fiber/detail/fiber.h"
 
@@ -7,7 +8,7 @@ namespace fiber {
 namespace detail {
 
 void Benchmark_FiberSwitch(benchmark::State &state) {
-  constexpr int kFiberCount = 10000;
+  constexpr int kFiberCount = 2 * 10000;
   std::unique_ptr<Fiber> master;
   std::unique_ptr<Fiber> worker[kFiberCount];
 
@@ -16,7 +17,22 @@ void Benchmark_FiberSwitch(benchmark::State &state) {
   master = Fiber::Create([&]() {
     while (state.KeepRunning()) {
       ++cnt;
-      worker[Random(kFiberCount - 1)]->Resume();
+      auto &w1 = worker[Random(kFiberCount - 1)];
+      auto &w2 = worker[Random(kFiberCount - 1)];
+      auto start = ReadSteadyClock();
+      w1->Resume();
+      w2->Resume();
+      w1->Resume();
+      w2->Resume();
+      w1->Resume();
+      w2->Resume();
+      w1->Resume();
+      w2->Resume();
+      auto end = ReadSteadyClock();
+      auto duration = std::chrono::duration_cast<std::chrono::duration<double>>(
+                          end - start) /
+                      8;
+      state.SetIterationTime(duration.count());
     }
 
     cnt = -1;
@@ -29,6 +45,9 @@ void Benchmark_FiberSwitch(benchmark::State &state) {
     worker[i] = Fiber::Create([&, i]() {
       while (cnt != -1) {
         master->Resume();
+        master->Resume();
+        master->Resume();
+        master->Resume();
       }
     });
   }
@@ -39,7 +58,7 @@ void Benchmark_FiberSwitch(benchmark::State &state) {
   master->Resume();
 }
 
-BENCHMARK(Benchmark_FiberSwitch);
+BENCHMARK(Benchmark_FiberSwitch)->UseManualTime();
 } // namespace detail
 } // namespace fiber
 } // namespace tile