Databases
StackOverflow2013
Postsdbo
POStrange lag in http pipeline with ASP.NET MVC on IIS6
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POStrange lag in http pipeline with ASP.NET MVC on IIS6
    primarykey
    data
    text
    <p>I have an ASP.NET MVC application running on IIS6 with enabled wildcard mapping. After performing some load tests I digged into log files with focus on the slow requests. I have a log file from the load testing application, IIS log file and the log file from the <a href="http://msdn.microsoft.com/en-us/library/system.web.ihttpmodule.aspx" rel="nofollow noreferrer"><code>IHttpModule</code></a> I develop for this purpose which records time of <a href="http://msdn.microsoft.com/en-us/library/system.web.httpapplication.beginrequest.aspx" rel="nofollow noreferrer"><code>Application.BeginRequest</code></a> and <a href="http://msdn.microsoft.com/en-us/library/system.web.httpapplication.endrequest.aspx" rel="nofollow noreferrer"><code>Application.EndRequest</code></a>.</p> <p>When I compared data for slow requests in the IIS log file and the log file of my module I've discovered some odd behavior.</p> <pre><code>var request_processing_start = iis_log_file.time - iis_log_file.taken var aspnet_processing_start = my_module_log_file.begin_request_called var aspnet_processing_end = my_module_log_file.end_request_called var request_processing_end = iis_log_file.time </code></pre> <p>For all requests values of <code>aspnet_processing_end</code> and <code>request_processing_end</code> match pretty close (difference no more then few milliseconds). However some requests have timespan between <code>request_processing_start</code> and <code>aspnet_processing_start</code> up to 30 seconds. <strong>What is the cause of this lag and a how can I prevent it?</strong></p> <hr> <p>Some more details of load test I've done:</p> <ul> <li><strong>Number of requests:</strong> on long time average 2 per seconds, in the peaks no more then 20 per second. (This is really low, we cannot blame wildcard mapping)</li> <li><strong>Processor usage:</strong> flat line bellow 5% (We cannot blame lack of cpu power)</li> <li><strong>Free memory:</strong> more than 1GB (Memory isn't also issue).</li> <li>The lag I described is occurring only when the server is under load. When the load testing application isn't running it cannot be reproduced.</li> </ul>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USJakub Šturc
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. POStrange lag in http pipeline with ASP.NET MVC on IIS6
      1. USbzlm
      1. VTFavorite
    2. VO
      singulars
      1. POStrange lag in http pipeline with ASP.NET MVC on IIS6
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POStrange lag in http pipeline with ASP.NET MVC on IIS6
      1. USJakub Šturc
      1. VTFavorite
    1. CODid you figure out what was wrong? I am having a similar problem in an application I am working on. The platform for my application is IIS 7.5, ASP.NET 4.0, ASP.NET MVC 3.0 and Entity Framework 4.0.
      singulars
      1. POStrange lag in http pipeline with ASP.NET MVC on IIS6
      1. USDhwanil Shah
    2. CO@Dhwanil: We didn't. However we optimized several bottlenecks and we haven't been facing this problem recently. My guess is that the requests been waiting in ASP.NET request queue. Try to play with `processModel/maxworkerthreads` and also if your app is calling any external web services with `connectionManagement/maxconnection`.
      singulars
      1. POStrange lag in http pipeline with ASP.NET MVC on IIS6
      1. USJakub Šturc
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload