723c47550e
Provides focused microbenchmarks for expression evaluation hot paths (dynamic attrs, getDerivations attr scanning, and repeated builtins.match).
46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
#include <benchmark/benchmark.h>
|
|
|
|
#include "nix/expr/eval.hh"
|
|
#include "nix/expr/eval-settings.hh"
|
|
#include "nix/fetchers/fetch-settings.hh"
|
|
#include "nix/store/store-open.hh"
|
|
|
|
using namespace nix;
|
|
|
|
static void BM_EvalManyBuiltinsMatchSameRegex(benchmark::State & state)
|
|
{
|
|
static constexpr int iterations = 5'000;
|
|
|
|
static constexpr std::string_view exprStr =
|
|
"builtins.foldl' "
|
|
"(acc: _: acc + builtins.length (builtins.match \"a\" \"a\")) "
|
|
"0 "
|
|
"(builtins.genList (x: x) "
|
|
"5000)";
|
|
|
|
for (auto _ : state) {
|
|
state.PauseTiming();
|
|
|
|
auto store = openStore("dummy://");
|
|
fetchers::Settings fetchSettings{};
|
|
bool readOnlyMode = true;
|
|
EvalSettings evalSettings{readOnlyMode};
|
|
evalSettings.nixPath = {};
|
|
|
|
EvalState st({}, store, fetchSettings, evalSettings, nullptr);
|
|
Expr * expr = st.parseExprFromString(std::string(exprStr), st.rootPath(CanonPath::root));
|
|
|
|
Value v;
|
|
|
|
state.ResumeTiming();
|
|
|
|
st.eval(expr, v);
|
|
st.forceValue(v, noPos);
|
|
benchmark::DoNotOptimize(v);
|
|
}
|
|
|
|
state.SetItemsProcessed(state.iterations() * iterations);
|
|
}
|
|
|
|
BENCHMARK(BM_EvalManyBuiltinsMatchSameRegex);
|