public static string Start(string etlPath, IEnumerable <ProviderInfo> providerInfo, int bufferSizeMB = 64)
{
EnsureUnloadHandlerRegistered();
var userSessionName = "xunit.performance.logger." + Guid.NewGuid().ToString();
Sessions sessions = new Sessions();
sessions.UserFileName = Path.ChangeExtension(etlPath, ".user.etl");
sessions.KernelFileName = Path.ChangeExtension(etlPath, ".kernel.etl");
sessions.MergedFileName = etlPath;
var mergedProviderInfo = ProviderInfo.Merge(providerInfo);
try
{
sessions.UserSession = new TraceEventSession(userSessionName, sessions.UserFileName);
sessions.UserSession.BufferSizeMB = bufferSizeMB;
if (IsWin8OrGreater)
{
var availableCpuCounters = TraceEventProfileSources.GetInfo();
var cpuCounterIds = new List <int>();
var cpuCounterIntervals = new List <int>();
foreach (var cpuInfo in mergedProviderInfo.OfType <CpuCounterInfo>())
{
ProfileSourceInfo profInfo;
if (availableCpuCounters.TryGetValue(cpuInfo.CounterName, out profInfo))
{
cpuCounterIds.Add(profInfo.ID);
cpuCounterIntervals.Add(Math.Min(profInfo.MaxInterval, Math.Max(profInfo.MinInterval, cpuInfo.Interval)));
}
}
if (cpuCounterIds.Count > 0)
{
TraceEventProfileSources.Set(cpuCounterIds.ToArray(), cpuCounterIntervals.ToArray());
}
}
var kernelInfo = mergedProviderInfo.OfType <KernelProviderInfo>().FirstOrDefault();
if (kernelInfo != null && NeedSeparateKernelSession(kernelInfo.Keywords))
{
sessions.KernelSession = new TraceEventSession(KernelTraceEventParser.KernelSessionName, sessions.KernelFileName);
sessions.KernelSession.BufferSizeMB = bufferSizeMB;
}
else
{
sessions.KernelFileName = sessions.UserFileName;
sessions.KernelSession = sessions.UserSession;
}
if (kernelInfo != null)
{
var kernelKeywords = (KernelTraceEventParser.Keywords)kernelInfo.Keywords;
var kernelStackKeywords = (KernelTraceEventParser.Keywords)kernelInfo.StackKeywords;
sessions.KernelSession.EnableKernelProvider(kernelKeywords, kernelStackKeywords);
}
foreach (var userInfo in mergedProviderInfo.OfType <UserProviderInfo>())
{
sessions.UserSession.EnableProvider(userInfo.ProviderGuid, userInfo.Level, userInfo.Keywords);
}
s_sessions[userSessionName] = sessions;
}
catch
{
sessions.Close();
throw;
}
return(userSessionName);
}