public void First_call_to_meter_returns_zero()
{
var meter = new HostCpuUsageMeterFast();
var usage = meter.GetHostCpuUsage();
usage.Should().Be(0);
}
public void Measures_total_CPU_usage()
{
using (var testProcess = new TestProcessHandle())
{
var meter = new HostCpuUsageMeterFast();
var cores = ProcessorInfo.LogicalCores;
var observationsCount = 10;
var lowValues = TestHelpers.GetMeterValues(
() => meter.GetHostCpuUsage() * cores,
TimeSpan.FromMilliseconds(255),
observationsCount);
testProcess.EatCpu(cores - 1);
var highValues = TestHelpers.GetMeterValues(
() => meter.GetHostCpuUsage() * cores,
TimeSpan.FromMilliseconds(255),
observationsCount);
Console.WriteLine($"Low values: {string.Join(", ", lowValues)}");
Console.WriteLine($"High values: {string.Join(", ", highValues)}");
highValues
.Count(h => lowValues.Count(l => l < h) > observationsCount * 0.75)
.Should()
.BeGreaterOrEqualTo((int)(observationsCount * 0.75));
}
}
public void Value_is_cached_for_next_250_milliseconds()
{
var cachePeriod = 250.Milliseconds();
var meter = new HostCpuUsageMeterFast();
// warmup meter
TestHelpers.GetMeterValues(() => meter.GetHostCpuUsage(), cachePeriod, 2);
var results = TestHelpers.GetMeterValues(
() => meter.GetHostCpuUsage(),
((cachePeriod - 20.Milliseconds()).Ticks / 5).Ticks(),
5);
results.Should().AllBeEquivalentTo(results[0]);
}
