public void CollectGcMetrics()
{
var logger = new TestLogger(LogLevel.Trace);
string traceEventSessionName;
using (var gcMetricsProvider = new GcMetricsProvider(logger))
{
traceEventSessionName = gcMetricsProvider.TraceEventSessionName;
gcMetricsProvider.IsMetricAlreadyCaptured.Should().BeFalse();
#if !NETCOREAPP2_1
//EventSource Microsoft-Windows-DotNETRuntime is only 2.2+, no gc metrics on 2.1
//repeat the allocation multiple times and make sure at least 1 GetSamples() call returns value
// ReSharper disable once TooWideLocalVariableScope
// ReSharper disable once RedundantAssignment
var containsValue = false;
var hasGenSize = false;
var hasGcTime = false;
for (var j = 0; j < 10; j++)
{
for (var i = 0; i < 500; i++)
{
var array = new int[10000000];
// In order to make sure the line above is not optimized away, let's use the array:
Console.WriteLine($"GC test, int[] allocated with length: {array.Length}");
}
GC.Collect(2, GCCollectionMode.Forced, true, true);
GC.WaitForFullGCComplete();
GC.Collect(2, GCCollectionMode.Forced, true, true);
for (var i = 0; i < 500; i++)
{
var array = new int[10000000];
// In order to make sure the line above is not optimized away, let's use the array:
Console.WriteLine($"GC test, int[] allocated with length: {array.Length}");
}
GC.Collect(2, GCCollectionMode.Forced, true, true);
GC.WaitForFullGCComplete();
GC.Collect(2, GCCollectionMode.Forced, true, true);
var samples = gcMetricsProvider.GetSamples()?.ToArray();
containsValue = samples != null && samples.Any();
hasGenSize = samples != null && samples
.Any(n => (n.KeyValue.Key.Contains("gen0size") || n.KeyValue.Key.Contains("gen1size") ||
n.KeyValue.Key.Contains("gen2size") || n.KeyValue.Key.Contains("gen3size")) &&
n.KeyValue.Value > 0);
hasGcTime = samples != null && samples
.Any(n => n.KeyValue.Key.Contains("clr.gc.time") && n.KeyValue.Value > 0);
if (containsValue && hasGenSize && hasGcTime)
{
break;
}
}
if (PlatformDetection.IsDotNetFullFramework)
{
if (logger.Lines.Any(n => n.Contains("TraceEventSession initialization failed - GC metrics won't be collected")))
{
// If initialization fails, (e.g. because ETW session initalization fails) we don't assert
_output.WriteLine("Initialization failed. don't make assertions");
return;
}
}
if (PlatformDetection.IsDotNetCore || PlatformDetection.IsDotNet5)
{
if (!logger.Lines.Any(n => n.Contains("OnEventWritten with GC")))
{
// If no OnWritten with a GC event was called then initialization failed -> we don't assert
_output.WriteLine("Initialization failed. don't make assertions");
return;
}
}
containsValue.Should().BeTrue();
hasGenSize.Should().BeTrue();
hasGcTime.Should().BeTrue();
gcMetricsProvider.IsMetricAlreadyCaptured.Should().BeTrue();
#endif
}
if (PlatformDetection.IsDotNetFullFramework)
{
var traceEventSession = TraceEventSession.GetActiveSession(traceEventSessionName);
traceEventSession.Should().BeNull();
}
}
public void CollectGcMetrics()
{
var logger = new TestLogger(LogLevel.Trace);
string traceEventSessionName;
using (var gcMetricsProvider = new GcMetricsProvider(logger))
{
traceEventSessionName = gcMetricsProvider.TraceEventSessionName;
gcMetricsProvider.IsMetricAlreadyCaptured.Should().BeFalse();
#if !NETCOREAPP2_1
//EventSource Microsoft-Windows-DotNETRuntime is only 2.2+, no gc metrics on 2.1
//repeat the allocation multiple times and make sure at least 1 GetSamples() call returns value
// ReSharper disable once TooWideLocalVariableScope
// ReSharper disable once RedundantAssignment
var containsValue = false;
for (var j = 0; j < 1000; j++)
{
for (var i = 0; i < 300_000; i++)
{
var _ = new int[100];
}
GC.Collect();
for (var i = 0; i < 300_000; i++)
{
var _ = new int[100];
}
GC.Collect();
var samples = gcMetricsProvider.GetSamples();
containsValue = samples != null && samples.Any();
if (containsValue)
{
break;
}
}
if (PlatformDetection.IsDotNetFullFramework)
{
if (logger.Lines.Any(n => n.Contains("TraceEventSession initialization failed - GC metrics won't be collected")))
{
// If initialization fails, (e.g. because ETW session initalization fails) we don't assert
_output.WriteLine("Initialization failed. don't make assertions");
return;
}
}
if (PlatformDetection.IsDotNetCore || PlatformDetection.IsDotNet5)
{
if (!logger.Lines.Any(n => n.Contains("OnEventWritten with GC")))
{
// If no OnWritten with a GC event was called then initialization failed -> we don't assert
_output.WriteLine("Initialization failed. don't make assertions");
return;
}
}
containsValue.Should().BeTrue();
gcMetricsProvider.IsMetricAlreadyCaptured.Should().BeTrue();
#endif
}
if (PlatformDetection.IsDotNetFullFramework)
{
var traceEventSession = TraceEventSession.GetActiveSession(traceEventSessionName);
traceEventSession.Should().BeNull();
}
}