ahh

Benchmark      Time(ns)        CPU(ns)     Iterations
-----------------------------------------------------
raw time: 56.25ns
BM_RCULocked         56.6          903      100000000  
raw time: 20.5ns
BM_View              20.6          329      100000000  

Benchmark      Time(ns)        CPU(ns)     Iterations
-----------------------------------------------------
raw time: 57.01ns

ahh

ahh@madcat % ./raw; echo $?
0
ahh@madcat % ./raw; echo $?
48
ahh@madcat % ./raw; echo $?
16
ahh@madcat % ./raw; echo $?
32

ahh

.globl _start
.section .text
_start:
movq $0x3c, %rax
movq %rsp, %rdi
andq $63, %rdi
syscall

ahh

  int64_t before = rdtsc();
  SpawnNThreadsRunning(15, [&shared]() {
    for (int i = 0; i < reps; ++i) {
      auto snapshot = shared.Get();
      // ... do some meaningless work...
    }
  });
  for (int i = 0; i < reps; ++i) {
    auto snapshot = shared.Get();
    // ... do some meaningless work...

ahh

  int64_t before = rdtsc();
  SpawnNThreadsRunning(15, [&shared]() {
    for (int i = 0; i < reps; ++i) {
      auto snapshot = shared.Get();
      // ... do some meaningless work...
    }
  });
  for (int i = 0; i < reps; ++i) {
    auto snapshot = shared.Get();
    // ... do some meaningless work...

ahh

void BM_View(int reps) {
  rcu::View<char> shared;
  SpawnNThreadsRunning(15, [&shared]() {
    for (int i = 0; i < reps; ++i) {
      auto snapshot = shared.Get();
      // ... do some meaningless work...
    }
  });
  for (int i = 0; i < reps; ++i) {
    auto snapshot = shared.Get();

ahh

static rcu::View<char> shared;

void BM_View(int reps) {
  for (int i = 0; i < reps; ++i) {
    auto snapshot = shared.Get();
    // ... do some meaningless work...
  }
}

BENCHMARK(BM_View)->Threads(16);

ahh

for (int i = 0; i < n; ++i) {
  f(x, y, z) += q;
}