Page generation time - ASP.Net MVC - asp.net

Question

I'm looking for a way to track how long it took for a page to be generated by the server. I know I can use Trace to track this but I need a way to display this per page.
Its ASP.Net MVC 2

Answer 1

You can implement it like a ActionFilterAttribute
[AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
public class LoggingAttribute : ActionFilterAttribute
{
private readonly Stopwatch _sw;
public LoggingAttribute()
{
_sw = new Stopwatch();
}
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
_sw.Start();
Debug.WriteLine("Beginning executing: " + GetControllerAndActionName(filterContext.ActionDescriptor));
}
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
_sw.Stop();
var ms = _sw.ElapsedMilliseconds;
Debug.WriteLine("Finishing executing: " + GetControllerAndActionName(filterContext.ActionDescriptor));
Debug.WriteLine("Time elapsed: "+ TimeSpan.FromMilliseconds(ms).TotalSeconds);
}
private string GetControllerAndActionName(ActionDescriptor actionDescriptor)
{
return actionDescriptor.ControllerDescriptor.ControllerName + " - " + actionDescriptor.ActionName;
}
}
Decorate every controller or action-method with it and voila, it spit outs the text in debug.
EDIT: If you want to print it on the page you could add this snippet to the OnActionExecuted method
if(filterContext.Result is ViewResult) { //Make sure the request is a ViewResult, ie. a page
((ViewResult) filterContext.Result).ViewData["ExecutionTime"] = ms; //Set the viewdata dictionary
}
Now you have the executiontime saved in ViewData and can access it in the page.. I usually put it in the masterpage like this
<!-- The page took <%= ViewData["ExecutionTime"] %> ms to execute -->

Answer 2

Yep the Derin Suggestion is the standard Way to do it in an ASP.NEt application, i would just suggest add an if so it does not interfere with non-HTML responses:
EDIT: added complete implementation
public class PerformanceMonitorModule : IHttpModule
{
public void Init(HttpApplication context)
{
context.PreRequestHandlerExecute += delegate(object sender, EventArgs e)
{
//Set Page Timer Star
HttpContext requestContext = ((HttpApplication)sender).Context;
Stopwatch timer = new Stopwatch();
requestContext.Items["Timer"] = timer;
timer.Start();
};
context.PostRequestHandlerExecute += delegate(object sender, EventArgs e)
{
HttpContext httpContext = ((HttpApplication)sender).Context;
HttpResponse response = httpContext.Response;
Stopwatch timer = (Stopwatch)httpContext.Items["Timer"];
timer.Stop();
// Don't interfere with non-HTML responses
if (response.ContentType == "text/html")
{
double seconds = (double)timer.ElapsedTicks / Stopwatch.Frequency;
string result_time = string.Format("{0:F4} sec ", seconds);
RenderQueriesToResponse(response,result_time);
}
};
}
void RenderQueriesToResponse(HttpResponse response, string result_time)
{
response.Write("<div style=\"margin: 5px; background-color: #FFFF00\"");
response.Write(string.Format("<b>Page Generated in "+ result_time));
response.Write("</div>");
}
public void Dispose() { /* Not needed */ }
}
you can also add some style to it...
And remember to register your Module in WebConfig inside httpModules Section:
<add name="Name" type="namespace, dll"/>
For a Complete Reference about this check the Pro ASP.NET MVC Framework by Steven Sanderson - Chapter 15 - Performance, Monitoring Page Generation Times.
EDIT:(comment #Pino)
Here is the example for my project:
alt text http://www.diarioplus.com/files/pictures/example_performance.JPG

Answer 3

It will depend on where you want to include this information. For example you could write an http handler that will display the render time after the </html> tag:
public class RenderTimeModule : IHttpModule
{
public void Init(HttpApplication context)
{
context.BeginRequest += (sender, e) =>
{
var watch = new Stopwatch();
var app = (HttpApplication)sender;
app.Context.Items["Stopwatch"] = watch;
watch.Start();
};
context.EndRequest += (sender, e) =>
{
var app = (HttpApplication)sender;
var watch = (Stopwatch)app.Context.Items["Stopwatch"];
watch.Stop();
var ts = watch.Elapsed;
string elapsedTime = String.Format("{0} ms", ts.TotalMilliseconds);
app.Context.Response.Write(elapsedTime);
};
}
public void Dispose()
{
}
}
If you want to display render time somewhere in the middle of the html page then this render time will not account for the total page render time.