PerformanceTests/MallocBench/MallocBench/churn.cpp

/*
 * Copyright (C) 2014 Apple Inc. All rights reserved.
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#include "CPUCount.h"
#include "churn.h"
#include <memory>
#include <stddef.h>

#include "mbmalloc.h"

struct HeapDouble {
    void* operator new(size_t size) { return mbmalloc(size); }
    void operator delete(void* p, size_t size) { mbfree(p, size); }

    HeapDouble(double d) : value(d) { }
    const HeapDouble& operator+=(const HeapDouble& other) { value += other.value; return *this; }
    double value;
};

void benchmark_churn(CommandLine& commandLine)
{
    size_t times = 7000000;
    if (commandLine.isParallel())
        times /= cpuCount();

    auto total = std::unique_ptr<HeapDouble>(new HeapDouble(0.0));
    for (size_t i = 0; i < times; ++i) {
        auto heapDouble = std::unique_ptr<HeapDouble>(new HeapDouble(i));
        *total += *heapDouble;
    }
}