Re: system hang debug [modified] - C# Discussion Boards

George_George19-Jan-09 1:27

19-Jan-09 1:27

Agree, Navaneeth. Smile | :)

regards,
George

George_George19-Jan-09 1:28

19-Jan-09 1:28

Thanks Luc!

I found the root cause is a method is timeout. I posted my code in the below link. Do you have any ideas? I suspect there is a bug or leak in my code, but I am not 100% sure. Any ideas?

http://www.codeproject.com/script/Forums/View.aspx?fid=1649&msg=2885910[^]

regards,
George

Luc Pattyn19-Jan-09 1:53

19-Jan-09 1:53

I have lots of ideas, the first and most important ones are here already[^].

Smile | :)

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modified on Friday, June 10, 2011 12:14 PM

George_George19-Jan-09 2:05

19-Jan-09 2:05

Hi Luc,

I have read them and the timeout issue is found from your advice when I narrow down my code. I do not know why there is unexpected timeout. Any ideas?

regards,
George

Luc Pattyn19-Jan-09 2:14

19-Jan-09 2:14

George_George wrote:
the timeout issue is found

Please explain. And did it cause a code change?

George_George wrote:
Any ideas?

Lots of them.
Log everything with timing info, up to milliseconds.
Show us the logs.
Don't trust anything.
What are those servers? your code too? Make it log its actions too!
You're the guy trying to send huge files while the network traffic is low, aren't you?
Tell us the complete story, not just some snippets.
Experiment. Try longer timeouts.
Catch ALL exceptions, not just WebExceptions. Log them too.
etc. etc.

Summary: observe, add observation tools, observe more; think, formulate an hypothesis, validate
your hypothesis, use the gray cells.

Smile | :)

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George_George19-Jan-09 2:27

19-Jan-09 2:27

Thanks Luc!

It is strange that when I change the address to external servers, like google.com and ask.com. The results are the same -- for the beginning couple of times, the connections are successful, but for the following connections, all timeout. Could you reproduce?

regards,
George

Luc Pattyn19-Jan-09 2:41

19-Jan-09 2:41

There is no need to reproduce, you just told everyone what the problem is.
How many files can one open on a PC?

Smile | :)

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modified on Friday, June 10, 2011 12:15 PM

George_George19-Jan-09 2:47

19-Jan-09 2:47

Thanks Luc,

1.

"How many files can one open on a PC?" -- is it related to my question?

2.

I find when I call close method on response, the problem is solved. Why? .Net does not release resource automatically?

regards,
George

Luc Pattyn19-Jan-09 2:53

19-Jan-09 2:53

George_George wrote:
is it related to my question?

was it part of my reply to your question?

George_George wrote:
.Net does not release resource automatically?

it does, in a lazy way. That is why we have Dispose() and Close() methods, so we can tell it to perform some cleanup sooner hence reducing the load of the app on system resources. When an object no longer needs to be open, you should call Close() if that exists. When an object is no longer needed, you should call Dispose() if that exists, and not touch it any more. That is Kyoto for programmers.

Smile | :)

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George_George19-Jan-09 2:56

19-Jan-09 2:56

Thanks Luc!

1.

Why if I do not call close, there will be timeout? I can not think of the relationship between them. Smile | :)

2.

"was it part of my reply to your question?" -- confused. What do you want to express?

regards,
George

Luc Pattyn19-Jan-09 3:18

19-Jan-09 3:18

George_George wrote:
Why ... there will be timeout?

GetResponse needs some system resources to execute the request, those resources are finite, and since you have chosen not to release them explicitly, it has to wait for them and can not even start executing your command, possibly longer than the allotted time to perform its entire operation.

The way networking has been implemented there is only a limited number of concurrent operations supported; not closing some helps in hitting the ceiling pretty soon.

Smile | :)

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modified on Friday, June 10, 2011 12:16 PM

George_George19-Jan-09 19:20

19-Jan-09 19:20

Thanks Luc,

"those resources are finite" -- should be open connection handles in my scenario?

My confusion is, what is the limitation number? Any documents mentions the number? I find it is too small, in my testing, less than 10. Smile | :)

regards,
George

Luc Pattyn19-Jan-09 21:24

How to use design pattern for calling multiple assemblies

19-Jan-09 21:24

George_George wrote:
open connection handles in my scenario?

amongst others. empty buffers in a protocol stack, whatever.

George_George wrote:
what is the limitation number?

I don't know, I never had a need to know. I close stuff in time.

George_George wrote:
Any documents mentions the number?

I don't know. Your search tools are as good as mine.

Smile | :)

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mpavas18-Jan-09 19:12

mpavas

18-Jan-09 19:12

Hello,

I have a project which uses various different assmeblies for each task
for example:

Crop pdf - assembly
Write Word - assembly
Create excel and convert to HTML - assembly

Now there can be n number of assemblies which will be used based on some condition.

I have two questions as below:

What kind of pattern will be best suited for this?
How can I make sure that the code written by each individual for each assembly do not have a common code in place.

Regards,
Pavas

Re: How to use design pattern for calling multiple assemblies

N a v a n e e t h18-Jan-09 19:51

N a v a n e e t h

18-Jan-09 19:51

mpavas wrote:
What kind of pattern will be best suited for this?

Create a common interface which all your assemblies has to implement. You can use Factory pattern and return the interface instance. pseudo code follows

Interface ITask{
   void DoTask();
}

ITask task = TaskFactory.GetTask(TaskIdentifier)
task.DoTask()

TaskFactory.GetTask will check the conditions and load relevant assemblies using reflection and return it's instance.

mpavas wrote:
How can I make sure that the code written by each individual for each assembly do not have a common code in place.

This is not clear. Can you explain?

Navaneeth

How to use google | Ask smart questions

Re: How to use design pattern for calling multiple assemblies

mpavas18-Jan-09 23:04

mpavas

18-Jan-09 23:04

Thanks,

The last question was:

There are 10 developers writing different assemblies.
Now how can we make sure they do not use duplicate codes.. I guess we need to fist list out all the different methods hence we can re-use them.

Thanks for the suggestion

Regards,
Pavas

Re: How to use design pattern for calling multiple assemblies

N a v a n e e t h19-Jan-09 14:46

N a v a n e e t h

19-Jan-09 14:46

mpavas wrote:
Now how can we make sure they do not use duplicate codes

What do you mean by duplicate code? You should conduct meetings with the team members and decide how each one has to code. Peer reviews also will work.

Navaneeth

How to use google | Ask smart questions

Re: How to use design pattern for calling multiple assemblies

mpavas19-Jan-09 18:24

mpavas

19-Jan-09 18:24

Yes, Thanks for answering the stupid question. I also thought that after posting the question Smile | :)

Regards,
Pavas

MDI Form

Abdul Rahman Hamidy18-Jan-09 19:05

Abdul Rahman Hamidy

18-Jan-09 19:05

Dear All,
I have MDI form and i put a panel into my mdi form and the panel dock status is fill.
I want to open other forms as child in this MDI form.
sure i use MdiParent properties of child form to assing parent to current form.
i open the child form, it gets opened, but it does not appear to the front, front of panel.
it means i can't see the child form.
how should i open to see the child form, if i must have panel there.

Thanks,

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan

CodingYoshi18-Jan-09 19:20

CodingYoshi

18-Jan-09 19:20

Chetor astee Abdul?

Use the BringToFront() property of the child form.

Abdul Rahman Hamidy18-Jan-09 19:38

Abdul Rahman Hamidy

18-Jan-09 19:38

thx and nice term,
BringToFront() method doesent work,
it does bring the form infront of panel.

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan

CodingYoshi18-Jan-09 19:46

CodingYoshi

18-Jan-09 19:46

Read the design code and make sure you have added the child to the mdi and not into the panel. If you have placed it into the panel and your making the panel invisible, the child form will also be invisible.

Abdul Rahman Hamidy18-Jan-09 20:09

Abdul Rahman Hamidy

18-Jan-09 20:09

i am doing this.
childF.MdiParent=this;

"this" refers to parent form which is MDI

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan