Re: [boost] Proposal: Monotonic Containers: Performance test

Subject: Re: [boost] Proposal: Monotonic Containers: Performance test
From: Christian Schladetsch (christian.schladetsch_at_[hidden])
Date: 2009-06-10 23:27:26

You will note that I made a mistake, and used the same timer for both. This
gave an incorrect result, as the std:: timer included the time for the first
test. Even so, it was 9x faster rather than 10x faster.

Another test, this time with more list insertions:

void test_speed()
{
    typedef monotonic::map<int, monotonic::list<int> > map_with_list;
    monotonic::inline_storage<1000000> storage;
    map_with_list m(storage);
    size_t count = 10000;
    boost::timer timer;
    for (size_t i = 0; i < count; ++i)
    {
        int random = rand() % 100;
        map_with_list::iterator iter = m.find(random);
        if (iter == m.end())
            m.insert(make_pair(random, monotonic::list<int>(storage)));
        else
            iter->second.push_back(i);
    }
    double elapsed = timer.elapsed();
    cout << "monotonic: " << elapsed << endl;

    // do the same thing, with std::containers
    {
        typedef std::map<int, std::list<int> > map_with_list;
        map_with_list m;
        boost::timer timer;
        for (size_t i = 0; i < count; ++i)
        {
            int random = rand() % 100;
            map_with_list::iterator iter = m.find(random);
            if (iter == m.end())
                m[random] = std::list<int>();
            else
                iter->second.push_back(i);
        }
        double elapsed = timer.elapsed();
        cout << "std: " << elapsed << endl;
    }
}

monotonic: 0.001
std: 0.017