IIS optimization

Hello,

I have an ASP.NET application which hosted on an IIS 6 (windows 2003 64
bit) It is very slow and my task is to find its bottleneck. I have no idea
where to start, Is there any tutorial or any good book in this subject? What
tools do I need?



Any information is very appreciated.



Best regards

m.a

Here is the answers:



> 1) How old is the server?
I could not get the question. It is under development and the server is up
for some month now, but I upgrade the asp.net code regularly.




> 2) How much RAM does it have?



1GB


> 3) How fast is / are its hard disk(s)?



I don't know.


> 4) Is your web app the only one running on this IIS box?



yes


> 5) Does performance vary at different times of the day?



No.


> 6) If you reboot the machine, does performance pick up noticably but then
> deteriorate over time?



I don't think so.


> 7) How many concurrent users?



1 user is slow




> Does the web app use an RDBMS? If so, what make and model, same machine
> or different machine?



Yes. Access database, but the size of database is small (8MByte). The
databse is on the same machine.


> 9) Has performance always been bad, or has it got worse over time?



It was better but now it is very bad.





Here is more information:



If I use iexplorer on the server, I am getting the same response. The cpu
doesn't show a lot of activity during a request. It took around 10 sec for a
response and the size of requested page is around 100Kbyte.



Regards

m.a

re:
!>> 2) How much RAM does it have?
!> 1GB

That's your biggest problem right there.

You need to upgrade to at least 2GB, preferably to 4GB.



Juan T. Llibre, asp.net MVP
asp.net faq : http://asp.net.do/faq/
=========================
"m.a" <ma.@spamoff.com> wrote in message news:%...
> Here is the answers:
>
>
>
>> 1) How old is the server?
> I could not get the question. It is under development and the server is up for some month now, but I upgrade the
> asp.net code regularly.
>
>
>
>
>> 2) How much RAM does it have?
>
>
>
> 1GB
>
>
>> 3) How fast is / are its hard disk(s)?
>
>
>
> I don't know.
>
>
>> 4) Is your web app the only one running on this IIS box?
>
>
>
> yes
>
>
>> 5) Does performance vary at different times of the day?
>
>
>
> No.
>
>
>> 6) If you reboot the machine, does performance pick up noticably but then deteriorate over time?
>
>
>
> I don't think so.
>
>
>> 7) How many concurrent users?
>
>
>
> 1 user is slow
>
>
>
>
>> Does the web app use an RDBMS? If so, what make and model, same machine or different machine?
>
>
>
> Yes. Access database, but the size of database is small (8MByte). The databse is on the same machine.
>
>
>> 9) Has performance always been bad, or has it got worse over time?
>
>
>
> It was better but now it is very bad.
>
>
>
>
>
> Here is more information:
>
>
>
> If I use iexplorer on the server, I am getting the same response. The cpu doesn't show a lot of activity during a
> request. It took around 10 sec for a response and the size of requested page is around 100Kbyte.
>
>
>
> Regards
>
>

Juan T. Llibre

Hello,



Thank you so much for looking at this.



>>> 1) How old is the server?
>> I could not get the question. It is under development and the server is
>> up for some month now, but I upgrade the asp.net code regularly.
>
> Is the machine recently purchased, or have you had it for years...



I am using a server from a hosting company and I belive it is around one or
two years old


>
>>> 2) How much RAM does it have?
>>
>> 1GB
>
> Almost no point in going any further with this - that is a ridiculously
> small amount of RAM for a web server. Nothing's going to improve until you
> sort this out...



By checking again, the server has dual processor and 2G RAM
>
>>> 3) How fast is / are its hard disk(s)?
>>
>> I don't know.
>
> Why don't you know? Don't you have access to the machine...?



Yes I have access but how can I check? I can check their capacity but not
their speed.
>
>>> 7) How many concurrent users?
>>
>> 1 user is slow
>
> That's not actually what I asked...



What did you ask?


>
>
>>> Does the web app use an RDBMS? If so, what make and model, same
>>> machine or different machine?
>>
>> Yes. Access database, but the size of database is small (8MByte). The
>> databse is on the same machine.
>
> That's your second problem. Jet databases (there's actually no such thing
> as an "Access database" per se) are completely unsuitable as backends for
> web applications...



I agree with you, but the database speed is good. If I run the application
on local machine and look at the time that takes to process data, It is very
quick, less than a sec, but the web server response is 10 sec!





Best regards

m.a

Thanks so much.



>>>>> 1) How old is the server?
>>>> I could not get the question. It is under development and the server is
>>>> up for some month now, but I upgrade the asp.net code regularly.
>>>
>>> Is the machine recently purchased, or have you had it for years...
>>
>> I am using a server from a hosting company and I belive it is around one
>> or two years old
>
> And you're certain that the hosting company is not renting out the server
> to other customers...?

It is a dedicated server and I should assume that it is my server and nobody
else using it.



>
>
>>>>> 2) How much RAM does it have?
>>>>
>>>> 1GB
>>>
>>> Almost no point in going any further with this - that is a ridiculously
>>> small amount of RAM for a web server. Nothing's going to improve until
>>> you sort this out...
>>
>> By checking again, the server has dual processor and 2G RAM
>
> 2GB RAM is better, but still very small...
>



How much do I need ?




>>>>> 7) How many concurrent users?
>>>>
>>>> 1 user is slow
>>>
>>> That's not actually what I asked...
>>
>> What did you ask?
>
> I asked how many concurrent users of the application there are...
>



There is only one user and it is slow. When more than one server is there,
it should be much slower.




>>>>> Does the web app use an RDBMS? If so, what make and model, same
>>>>> machine or different machine?
>>>>
>>>> Yes. Access database, but the size of database is small (8MByte). The
>>>> databse is on the same machine.
>>>
>>> That's your second problem. Jet databases (there's actually no such
>>> thing as an "Access database" per se) are completely unsuitable as
>>> backends for web applications...
>>
>> I agree with you, but the database speed is good. If I run the
>> application on local machine and look at the time that takes to process
>> data, It is very quick, less than a sec, but the web server response is
>> 10 sec!
>
> But it's the speed of your application on the remote server that is at
> fault... When you're running the app locally, you're the only user.
>
> Jet databases simply aren't designed for web applications - see the
> following Microsoft article: http://support.microsoft.com/kb/299973



There is not a lot of data in database and it is there to get query data. In
fact I check the cpu activity during a web request and it is very small,
only 10% of CPU power is used during a web request. So the server is not
heavily loaded. For this reason, I think there should be a problem in IIS
configuration.

What do you think?



Best regards

m.a

m.a wrote:
> I have an ASP.NET application which hosted on an IIS 6 (windows
> 2003 64 bit) It is very slow and my task is to find its bottleneck. I
> have no idea where to start, Is there any tutorial or any good book
> in this subject? What tools do I need?

How quickly does a simple html page come from the server?

Have you tried adding Trace="true" in the <%@ Page....%> directive to see if
anything stands out as taking a long time on the server as opposed to on the
test machine?

Andrew

Andrew Morton

Without running a profiler on your code, it is impossible to say for
sure. But the very first thing to look for, in my experience, is
using a lot of string concatenation.

Change any significant amount of concatenations to use StringBuilder
instead (especially it it's happening within a loop).

Might help a lot.

Second thing to check is whether scarce resources (files, database
connections, etc) are being disposed correctly.

On Feb 10, 9:48*am, "m.a" <m...@spamoff.com> wrote:
> Hello,
>
> * *I have an ASP.NET application which hosted on an IIS 6 (windows 2003 64
> bit) It is very slow and my task is to find its bottleneck. I have no idea
> where to start, Is there any tutorial or any good book in this subject? What
> tools do I need?
>
> Any information is very appreciated.
>
> Best regards

harborsparrow

////////////////////////////////////////////////////////////////

one option to find the bottleneck is to place a operation timer statement
between each line/statement

first declare some variables

??
private string OperationTimer = string.empty;
private int Counter = 0;
??

now in the code blocks itself you can place the below code in between each
statement

??
OperationTimer+= (Counter++).toString() + "\r\n" + DateTime.Now().toString()
+ "\r\n \r\n";
----line of code/operation
OperationTimer+= (Counter++).toString() + "\r\n" + DateTime.Now().toString()
+ "\r\n \r\n";
----line of code/operation
OperationTimer+= (Counter++).toString() + "\r\n" + DateTime.Now().toString()
+ "\r\n \r\n";
----line of code/operation
??

after you have completed building the string of Times pass it back to a
Textbox or Panel like this

??
Textbox1.Text = OperationTimer;
??

//////////////////////////////////////////////////////////////

"harborsparrow" <> wrote in message
news:1f54c9f7-3fb1-4ea3-a989-...
> Without running a profiler on your code, it is impossible to say for
> sure. But the very first thing to look for, in my experience, is
> using a lot of string concatenation.
>
> Change any significant amount of concatenations to use StringBuilder
> instead (especially it it's happening within a loop).
>
> Might help a lot.
>
> Second thing to check is whether scarce resources (files, database
> connections, etc) are being disposed correctly.
>
> On Feb 10, 9:48 am, "m.a" <m...@spamoff.com> wrote:
>> Hello,
>>
>> I have an ASP.NET application which hosted on an IIS 6 (windows 2003
>> 64
>> bit) It is very slow and my task is to find its bottleneck. I have no
>> idea
>> where to start, Is there any tutorial or any good book in this subject?
>> What
>> tools do I need?
>>
>> Any information is very appreciated.
>>
>> Best regards
>

James Wilson