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Defeat shared_ptr's single-threaded optimizations

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WeaselDB is always going to start multiple threads, so we don't care
about single-threaded performance
This commit is contained in:
Andrew Noyes
2025-09-11 13:13:05 -04:00
parent 5adbf8eee2
commit f83e21b5a0
1 changed files with 9 additions and 0 deletions
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9
benchmarks/bench_reference.cpp
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@@ -43,9 +43,16 @@ template <typename T> struct PointerTraits<Ref<T>> {
static const char *weak_name() { return "WeakRef"; } static const char *weak_name() { return "WeakRef"; }
}; };
// Force multi-threaded mode to defeat __libc_single_threaded optimization
void force_multithreaded() {
std::thread t([]() {});
t.join();
}
template <typename PtrType> template <typename PtrType>
void benchmark_creation(ankerl::nanobench::Bench &bench) { void benchmark_creation(ankerl::nanobench::Bench &bench) {
using Traits = PointerTraits<PtrType>; using Traits = PointerTraits<PtrType>;
force_multithreaded();
bench.run(std::string(Traits::name()) + " creation", [&] { bench.run(std::string(Traits::name()) + " creation", [&] {
auto ptr = Traits::make(TestObject{123}); auto ptr = Traits::make(TestObject{123});
@@ -56,6 +63,7 @@ void benchmark_creation(ankerl::nanobench::Bench &bench) {
template <typename PtrType> template <typename PtrType>
void benchmark_copy(ankerl::nanobench::Bench &bench) { void benchmark_copy(ankerl::nanobench::Bench &bench) {
using Traits = PointerTraits<PtrType>; using Traits = PointerTraits<PtrType>;
force_multithreaded();
auto original = Traits::make(TestObject{123}); auto original = Traits::make(TestObject{123});
bench.run(std::string(Traits::name()) + " copy", [&] { bench.run(std::string(Traits::name()) + " copy", [&] {
@@ -80,6 +88,7 @@ void benchmark_move(ankerl::nanobench::Bench &bench) {
template <typename PtrType> template <typename PtrType>
void benchmark_weak_copy(ankerl::nanobench::Bench &bench) { void benchmark_weak_copy(ankerl::nanobench::Bench &bench) {
using Traits = PointerTraits<PtrType>; using Traits = PointerTraits<PtrType>;
force_multithreaded();
auto strong_ptr = Traits::make(TestObject{123}); auto strong_ptr = Traits::make(TestObject{123});
typename Traits::weak_type weak_original = strong_ptr; typename Traits::weak_type weak_original = strong_ptr;