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• 06-10-2009, 5:00 AM

  ramh08 Joined on 06-10-2009, 4:55 AM Posts 4

  Intermittant performance issue Reply Contact We have a performance issue with an internet site supported by us developed in ASP. The application slows down in serving pages for a short stint (Some times it times out) and picks up immediately after few seconds. We have been working on the DB/Windows/Firewall to pin down the issue. Application environment UI: Classic ASP application Database: MS SQL Server 2000 Web server : IIS 6.0 hosted in Win 2k3 server (Virtual server on VM Ware) The application is in production for last 5 years. The slow down is a recent development and its not particular to any page/ module. We got the db queries monitored over a period of time and there has not been any major hit in performance. Again the issue is quite weird as it taxes the performance for a few seconds or a few minutes will be back to normal performance/speed.

• 06-10-2009, 6:42 AM

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  lextm Joined on 10-22-2008, 4:18 AM Shanghai, PRC Posts 1,262

  Re: Intermittant performance issue Reply Contact If your developers know how to read process dumps, they can follow our KB article here to troubleshoot the problem. If you need assistance from Microsoft, you can open a case via http://support.microsoft.com High CPU Hang http://support.microsoft.com/kb/919791   Hang http://support.microsoft.com/kb/919792 Lex Li Support Engineer at Microsoft --------------------------- This posting is provided "AS IS" with no warranties, and confers no rights.

• 06-12-2009, 6:04 AM

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  ramh08 Joined on 06-10-2009, 4:55 AM Posts 4

  Re: Intermittant performance issue Reply Contact Thanks alot for the reply... The site slows down is in infrequent intervals. Do we need to run the diagnostic tool to get the process dumps exactly during the "slow down" period? What are the possible reasons for a iis webserver slow down during intermittant intervals? Can this slow down be a result of some patch which was applied to IIS? Because the slowdown happened in an environment where recently no code change was done, no hardware were altered, no major software updates been done.

• 06-12-2009, 6:14 AM

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  ganeshanekar Joined on 11-15-2006, 12:29 AM India Posts 528

  Re: Intermittant performance issue Reply Contact ramh08: Again the issue is quite weird as it taxes the performance for a few seconds or a few minutes will be back to normal performance/speed. Does not seem to be IIS issue and the issue may be at network level somewhere. When it becomes slow, how slow it is? Minutes/Seconds? What happens if you browse directly on the server itselft. - This will help narrow down the issue. Also have you taken netmon trace and find out if there is a delay at network level. You may use debugdiag tool and capture 3-4 sets of manual hang dumps and see if the problem is really in IIS side. Also note that there is no settings in IIS which will show this behaviour. HTH. ~ Ganesh

• 06-16-2009, 8:35 AM

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  ramh08 Joined on 06-10-2009, 4:55 AM Posts 4	Re: Intermittant performance issue Reply Contact I used the debug diag tool to create manual process dumps and analysed the same. The tool analysed, and it said it did not detect any known problems on the dumps created.

• 06-16-2009, 9:17 AM

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  ganeshanekar Joined on 11-15-2006, 12:29 AM India Posts 528	Re: Intermittant performance issue Reply Contact That concludes the issue is somewhere else and not IIS.  Take netmon trace during slowness and see what is causing delay. HTH. ~ Ganesh

• 07-22-2009, 10:15 AM

  In reply to

  ramh08 Joined on 06-10-2009, 4:55 AM Posts 4

  Re: Intermittant performance issue Reply Contact The issue is still not resolved. There is an intermittent 3 minute delay occuring in the website, and after every small delay the performance picks up immediately. Even for static pages it takes time to load. The same page will be loaded with in seconds some other time. There is no specific frequency of the issue happening also. Can this be an application problem? or Can any patch update in the server can create the issue? Since this is a old ASP application hosted on Win2k3 server, Any policy which is causing this? Can this be a network problem?