public void TheNumberOfStopEventsMustBeEqualToStartEvents()
{
var sut = new ProcessMetrics();
sut.HandleIterationEvent(0, IterationMode.Overhead, 100); // start but no stop later on
Assert.Throws <InvalidOperationException>(() => sut.CalculateMetrics(null, Array.Empty <PreciseMachineCounter>()));
}
public void MetricsAreCorrectlyCalculatedPerIteration()
{
const int profileSourceId = 123;
const int interval = 100;
const ulong ip = 12345;
const long totalOperations = 100;
var sut = new ProcessMetrics();
for (int relativeTimestamp = 0; relativeTimestamp < 20; relativeTimestamp++)
{
sut.HandleIterationEvent(relativeTimestamp, IterationMode.Overhead, totalOperations); // Overhead iteration start at i
sut.HandleNewSample(relativeTimestamp + 0.1, ip, profileSourceId); // Engine overhead produces one PMC event per iteration
sut.HandleIterationEvent(relativeTimestamp + 0.5, IterationMode.Overhead, totalOperations); // Overhead iteration stop at i + 0.5
}
for (int relativeTimestamp = 20; relativeTimestamp < 40; relativeTimestamp++)
{
sut.HandleIterationEvent(relativeTimestamp, IterationMode.Workload, totalOperations); // Workload iteration start at i
sut.HandleNewSample(relativeTimestamp + 0.1, ip, profileSourceId); // Engine overhead produces one PMC event per iteration
sut.HandleNewSample(relativeTimestamp + 0.2, ip, profileSourceId); // benchmarked code
sut.HandleNewSample(relativeTimestamp + 0.3, ip, profileSourceId); // benchmarked code
sut.HandleNewSample(relativeTimestamp + 0.4, ip, profileSourceId); // benchmarked code
sut.HandleIterationEvent(relativeTimestamp + 0.5, IterationMode.Workload, totalOperations); // Workload iteration stop at i + 0.5
}
var metrics = sut.CalculateMetrics(
new Dictionary <int, int> {
{ profileSourceId, interval }
},
new [] { new PreciseMachineCounter(profileSourceId, "test", HardwareCounter.InstructionRetired, interval), });
const ulong expected = (4 * interval - interval) / totalOperations; // every workload was 4 events, the overhead was one and totalOperations times per iteration
Assert.Equal(expected, metrics.Single().Value);
}