system/utest/perftest/malloc-test.cpp

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <stdlib.h>

#include <perftest/perftest.h>

namespace {

// Measure the time taken to malloc() and free() a 100-byte block.
//
// This serves an example of a multi-step perf test.  It is also useful for
// getting a rough idea of the cost of malloc() and free().
bool MallocFreeTest(perftest::RepeatState* state) {
    state->DeclareStep("malloc");
    state->DeclareStep("free");
    while (state->KeepRunning()) {
        void* block = malloc(100);
        // Clang can optimize away pairs of malloc() and free() calls;
        // prevent it from doing that.
        perftest::DoNotOptimize(block);
        if (!block) {
            return false;
        }
        state->NextStep();
        free(block);
    }
    return true;
}

void RegisterTests() {
    perftest::RegisterTest("MallocFree/100bytes", MallocFreeTest);
}
PERFTEST_CTOR(RegisterTests);

}  // namespace