Function compareString

cachelib/benchmarks/SmallOperationMicroBench.cpp:185–207

}

void compareString(int len) {
  // Just a simple test to figure out cost of reading a string
  constexpr uint64_t kOps = 10'000'000;
  constexpr uint64_t kObjects = 100'000;
  std::vector<std::string> keys;
  const std::string keyCopy(len, 'a');
  for (uint64_t i = 0; i < kObjects; i++) {
    keys.push_back(keyCopy);
  }

  std::mt19937 gen;
  std::uniform_int_distribution<int> dist(0, kObjects - 1);
  {
    Timer t{folly::sformat("Read String - {: <3}", len), kOps};
    for (uint64_t i = 0; i < kOps; i++) {
      // Read from the vector of strings (first memory load)
      auto& k1 = keys[dist(gen)];
      auto& k2 = keys[dist(gen)];
      auto equal = bytesEqual(k1.data(), k2.data(), k1.size());
      folly::doNotOptimizeAway(equal);
    }
  }
}

void callMallctl() {
  constexpr uint64_t kOps = 10'000'000;