public static void Zip(string fileName)
{
var etlWriter = new ZippedETLWriter(fileName);
etlWriter.Zip = true;
etlWriter.CompressETL = true;
etlWriter.DeleteInputFile = true;
etlWriter.WriteArchive();
}
/// <summary>
/// CollectData doe will turn on logging of data from 'eventSourceName' to the file 'dataFileName'.
/// It will then call EventGenerator.CreateEvents and wait 12 seconds for it to generate some data.
/// </summary>
static void CollectData(string eventSourceName, string dataFileName)
{
// Today you have to be Admin to turn on ETW events (anyone can write ETW events).
if (!(TraceEventSession.IsElevated() ?? false))
{
Out.WriteLine("To turn on ETW events you need to be Administrator, please run from an Admin process.");
Debugger.Break();
return;
}
// As mentioned below, sessions can outlive the process that created them. Thus you need a way of
// naming the session so that you can 'reconnect' to it from another process. This is what the name
// is for. It can be anything, but it should be descriptive and unique. If you expect multiple versions
// of your program to run simultaneously, you need to generate unique names (e.g. add a process ID suffix)
// however this is dangerous because you can leave data collection on if the program ends unexpectedly.
//
// In this case we tell the session to place the data in MonitorToFileData.etl.
var sessionName = "SimpleTraceLogSession";
Out.WriteLine("Creating a '{0}' session writing to {1}", sessionName, dataFileName);
Out.WriteLine("Use 'logman query -ets' to see active sessions.");
Out.WriteLine("Use 'logman stop {0} -ets' to manually stop orphans.", sessionName);
using (var session = new TraceEventSession(sessionName, dataFileName)) // Since we give it a file name, the data goes there.
using (var kernelSession = new TraceEventSession(KernelTraceEventParser.KernelSessionName, Path.ChangeExtension(dataFileName, ".kernel.etl")))
{
/* BY DEFAULT ETW SESSIONS SURVIVE THE DEATH OF THE PROESS THAT CREATES THEM! */
// Unlike most other resources on the system, ETW session live beyond the lifetime of the
// process that created them. This is very useful in some scenarios, but also creates the
// very real possibility of leaving 'orphan' sessions running.
//
// To help avoid this by default TraceEventSession sets 'StopOnDispose' so that it will stop
// the ETW session if the TraceEventSession dies. Thus executions that 'clean up' the TraceEventSession
// will clean up the ETW session. This covers many cases (including throwing exceptions)
//
// However if the process is killed manually (including control C) this cleanup will not happen.
// Thus best practices include
//
// * Add a Control C handler that calls session.Dispose() so it gets cleaned up in this common case
// * use the same session name run-to-run so you don't create many orphans.
//
// By default TraceEventSessions are in 'create' mode where it assumes you want to create a new session.
// In this mode if a session already exists, it is stopped and the new one is created.
//
// Here we install the Control C handler. It is OK if Dispose is called more than once.
Console.CancelKeyPress += delegate(object sender, ConsoleCancelEventArgs e) { session.Dispose(); kernelSession.Dispose(); };
// Enable kernel events.
kernelSession.EnableKernelProvider(KernelTraceEventParser.Keywords.ImageLoad | KernelTraceEventParser.Keywords.Process | KernelTraceEventParser.Keywords.Thread);
// Enable my provider, you can call many of these on the same session to get events from other providers
// Turn on the eventSource given its name.
// Note we turn on Verbose level all keywords (ulong.MaxValue == 0xFFF....) and turn on stacks for
// this provider (for all events, until Windows 8.1 you can only turn on stacks for every event
// for a particular provider or no stacks)
var options = new TraceEventProviderOptions()
{
StacksEnabled = true
};
var restarted = session.EnableProvider(eventSourceName, TraceEventLevel.Verbose, ulong.MaxValue, options);
if (restarted) // Generally you don't bother with this warning, but for the demo we do.
{
Out.WriteLine("The session {0} was already active, it has been restarted.", sessionName);
}
// We also turn on CLR events because we need them to decode Stacks and we also get exception events (and their stacks)
session.EnableProvider(ClrTraceEventParser.ProviderGuid, TraceEventLevel.Verbose, (ulong)ClrTraceEventParser.Keywords.Default);
// Start another thread that Causes MyEventSource to create some events
// Normally this code as well as the EventSource itself would be in a different process.
EventGenerator.CreateEvents();
// Also generate some exceptions so we have interesting stacks to look at
Thread.Sleep(100);
EventGenerator.GenerateExceptions();
Out.WriteLine("Waiting 12 seconds for events to come in.");
Thread.Sleep(12000);
// Because the process in question (this process) lives both before and after the time the events were
// collected, we don't have complete information about JIT compiled methods in that method. There are
// some methods that were JIT compiled before the session started (e.g. SimpleTraceLog.Main) for which
// we do not have information. We collect this by forcing a CLR 'rundown' which will dump method information
// for JIT compiled methods that were not present. If you know that the process of interest ends before
// data collection ended or that data collection started before the process started, then this is not needed.
Out.WriteLine("Forcing rundown of JIT methods.");
var rundownFileName = Path.ChangeExtension(dataFileName, ".clrRundown.etl");
using (var rundownSession = new TraceEventSession(sessionName + "Rundown", rundownFileName))
{
rundownSession.EnableProvider(ClrRundownTraceEventParser.ProviderGuid, TraceEventLevel.Verbose, (ulong)ClrRundownTraceEventParser.Keywords.Default);
// Poll until 2 second goes by without growth.
for (var prevLength = new FileInfo(rundownFileName).Length; ;)
{
Thread.Sleep(2000);
var newLength = new FileInfo(rundownFileName).Length;
if (newLength == prevLength)
{
break;
}
prevLength = newLength;
}
}
Out.WriteLine("Done with rundown.");
}
Out.WriteLine("Zipping the raw files into a single '{0}' file.", dataFileName);
// At this point you have multiple ETL files that don't have all the information
// inside them necessary for analysis off the currentn machine. To do analsysis
// of the machine you need to merge the ETL files (which can be done with
// TraceEventSession.MergeInPlace(dataFileName, Out);
// However this does not get the symbolic information (NGEN PDBS) needed to
// decode the stacks in the .NET managed framewrok on another machine.
// To do the merging AND generate these NGEN images it is best to us ethe
// ZipppedETLWriter that does all this (and compresses all the files in a ZIP archive).
ZippedETLWriter writer = new ZippedETLWriter(dataFileName, Out);
writer.WriteArchive();
Out.WriteLine("Zip complete, output file = {0}", writer.ZipArchivePath);
}
public override TestResult[] Execute(ITestMethod testMethod)
{
TestResult[] errorResults = ValidateElevated(testMethod);
if (errorResults != null)
{
return(errorResults);
}
Exception signatureException = GetMethodSignatureException(testMethod);
if (signatureException != null)
{
return(testMethod.CreateExceptionResult(signatureException));
}
var runParameters = TestRunParameters.Read();
string logFolder = runParameters.LogFolder;
bool shouldLog = !string.IsNullOrEmpty(logFolder);
if (shouldLog)
{
try
{
logFolder = CreateLogFolder(logFolder, testMethod.TestMethodName);
}
catch (Exception e)
{
return(testMethod.CreateExceptionResult(e));
}
}
int iterations = runParameters.Iterations;
var results = new TestResult[iterations];
for (int iteration = 1; iteration <= iterations; iteration++)
{
string sessionName = $"{testMethod.TestMethodName}-{iteration}";
using (var session = new TraceEventSession(sessionName))
{
EnableKernelProviders(session, shouldLog);
TraceEventDispatcher source;
ZippedETLWriter writer = null;
if (shouldLog)
{
string etlPath = Path.Combine(logFolder, $"Iteration{iteration}.etl");
source = new ETWReloggerTraceEventSource(sessionName, TraceEventSourceType.Session, etlPath);
writer = new ZippedETLWriter(etlPath);
}
else
{
source = session.Source;
}
EnableProviders(session);
PerformanceTestContext context = CreateContext(source);
Task <TestResult> testTask = Task.Run(() => testMethod.Invoke(new object[] { context }));
// This is a blocking call that in the case of ETWReloggerTraceEventSource, must be run on the same
// thread as ETWReloggerTraceEventSource was created on. It will become unblocked when the
// PerformanceTestContext calls StopProcessing on the source.
source.Process();
TestResult result = testTask.Result;
string displayName = testMethod.TestMethodName;
if (iterations > 1)
{
displayName += $" [{iteration}/{iterations}]";
}
result.DisplayName = displayName;
session.Flush();
OnIterationEnded(context);
context.LogScenarios();
context.LogMemoryDelta();
context.LogMessage($"{displayName} completed. {session.EventsLost} events lost.");
context.WriteLogsToResult(result, writer);
results[iteration - 1] = result;
}
}
return(results);
}