LayoutTests/perf/object-keys.html

<script src="../resources/magnitude-perf.js"></script>
<script>
function setupFunction(magnitude)
{
    obj = {};
    for (var i = 0; i < magnitude; i++) {
        obj[i] = i;
    }
}

function test(magnitude)
{
    Object.keys(obj);
}

Magnitude.description("Tests that Object.keys is linear.");
Magnitude.numTrials = 5; // pretty noisy
Magnitude.successThreshold = 0.40; // 2 out of 5
Magnitude.initialExponent = 9;
Magnitude.numPoints = 5;
Magnitude.tolerance = 0.25; // 5%-25% deviations not uncommon
Magnitude.trim = 1;
Magnitude.run(setupFunction, test, Magnitude.LINEAR);
</script>