feat: add bench with PauseTiming

Author: not-matthias

examples/google_benchmark_bazel/pause_timing_bench.hpp

@@ -0,0 +1 @@
+../google_benchmark_cmake/pause_timing_bench.hpp

examples/google_benchmark_cmake/main.cpp

@@ -5,6 +5,7 @@
 #include "fibonacci_bench.hpp"
 #include "fixture_bench.hpp"
 #include "multithread_bench.hpp"
+#include "pause_timing_bench.hpp"
 #include "sleep_bench.hpp"
 #include "template_bench.hpp"
 

examples/google_benchmark_cmake/pause_timing_bench.hpp

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <benchmark/benchmark.h>
+
+#include <chrono>
+#include <numeric>
+#include <thread>
+#include <vector>
+
+__attribute__((noinline)) static uint64_t recursive_fib(int n) {
+  if (n <= 1) return n;
+  return recursive_fib(n - 1) + recursive_fib(n - 2);
+}
+
+__attribute__((noinline)) static uint64_t expensive_operation() {
+  // Large memory allocation
+  std::vector<uint64_t> data(1024 * 1024, 42);  // 8 MiB allocation
+
+  // Expensive recursive computation that will dominate flamegraph
+  uint64_t fib_result = recursive_fib(30);
+
+  // More expensive work
+  uint64_t sum = std::accumulate(data.begin(), data.end(), uint64_t(0));
+  benchmark::DoNotOptimize(sum);
+  benchmark::DoNotOptimize(fib_result);
+
+  return sum + fib_result;
+}
+
+NOINLINE static uint64_t actual_work() {
+  std::this_thread::sleep_for(std::chrono::milliseconds(1));
+  return 42;
+}
+
+static void BM_large_drop(benchmark::State& state) {
+  for (auto _ : state) {
+    state.PauseTiming();
+    benchmark::DoNotOptimize(expensive_operation());
+    state.ResumeTiming();
+
+    benchmark::DoNotOptimize(actual_work());
+
+    state.PauseTiming();
+    benchmark::DoNotOptimize(expensive_operation());
+    state.ResumeTiming();
+  }
+}
+BENCHMARK(BM_large_drop);
+
+static void BM_large_setup(benchmark::State& state) {
+  for (auto _ : state) {
+    state.PauseTiming();
+    benchmark::DoNotOptimize(expensive_operation());
+    state.ResumeTiming();
+
+    benchmark::DoNotOptimize(actual_work());
+  }
+}
+BENCHMARK(BM_large_setup);