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.NET Forum / ASP.NET / General / August 2007memory leak in asp 2.0
I wrote application on asp.net 2.0 using dataset. One dataset I put in session collection and other (which is small and common for other users) I put in application. I expected that it will get some amount of memory, however I expected that this amount of memory will be fixed and will depend on number of user. When I put code in production I discovered that aspnet_wp.exe increases memory which it uses. Each second 2meg. What may be the reason. I expected that when I load new page, every variable that I use in old page releases memory. How I can find where I did not release memory. I call each time 'Page unload' when I load new page but never when I close it. Aleks, What you describe is not a normal operating condition and may very well be caused by poorly written code (e.g, not closing connections, etc.) Peter  SignatureRecursion: see Recursion site: http://www.eggheadcafe.com unBlog: http://petesbloggerama.blogspot.com bogMetaFinder: http://www.blogmetafinder.com > I wrote application on asp.net 2.0 using dataset. One dataset I put in > session collection and other (which is small and common for other users) I [quoted text clipped - 6 lines] > I call each time 'Page unload' when I load new page but never when I close > it. I do not have recursion. The code is prety simple. At logon I open dataset and appropriate tableadapters and save them and few datatables in session. Some datatables I may fill on different pages. Some datatables I use on diferent tables to databind controls. May be dataadapter should be open for short time or control has hiden recursion. Also it would be useful to know how much specific page gets in memory or when I leave it forever, so I can release it forever. > Aleks, > What you describe is not a normal operating condition and may very well be [quoted text clipped - 17 lines] >> close >> it. Keep an eye out for Connections that are not immediately closed when filling or updating your DataSets. SignatureHTH, Kevin Spencer Microsoft MVP Printing Components, Email Components, FTP Client Classes, Enhanced Data Controls, much more. DSI PrintManager, Miradyne Component Libraries: http://www.miradyne.net >I do not have recursion. The code is prety simple. At logon I open dataset >and appropriate tableadapters and save them and few datatables in session. [quoted text clipped - 25 lines] >>> close >>> it. You want to tell that dataadapter in dataset is connection to database. Why then I need so much connections to database. Why one connection cannot serve all tables in dataset? And if I forced to reopen dataset each time when I load new page why I cannot close dataset as soon as it finished? it possible that I did not understand something. keep eye out means to watch closely or not to tuch? Or you mean that I think that datatable is filled and ready to bind control while in reality these procedures work parallel? > Keep an eye out for Connections that are not immediately closed when > filling or updating your DataSets. [quoted text clipped - 28 lines] >>>> close >>>> it. > I wrote application on asp.net 2.0 using dataset. One dataset I put in > session collection and other (which is small and common for other [quoted text clipped - 6 lines] > find where I did not release memory. I call each time 'Page unload' > when I load new page but never when I close it. What do you mean by "I call each time 'Page unload'"? You may place code in an Unload eventhandler, but that is called automatically. Hans Kesting I tried to add 'page unload' to code of web page. No code, just break point. When page loads or I click button on the page I stop at the break point. When I close page I do not have any break point. >> I wrote application on asp.net 2.0 using dataset. One dataset I put in >> session collection and other (which is small and common for other [quoted text clipped - 13 lines] > > Hans Kesting Almost certainly the problem is in storing large amount of data in session variables. See if you can minimize it. Another idea is to use out-of-process session management. SignatureEliyahu Goldin, Software Developer Microsoft MVP [ASP.NET] http://msmvps.com/blogs/egoldin http://usableasp.net >I wrote application on asp.net 2.0 using dataset. One dataset I put in >session collection and other (which is small and common for other users) I [quoted text clipped - 6 lines] >I call each time 'Page unload' when I load new page but never when I close >it. Probably you are right. Do you mean that I need to try web service? Or there are other ways also? > Almost certainly the problem is in storing large amount of data in session > variables. See if you can minimize it. Another idea is to use [quoted text clipped - 10 lines] >>memory. I call each time 'Page unload' when I load new page but never >>when I close it. Minimizing session using and disposing variables is an architectural decision. Out-of-process session management means using either a special Windows service available in asp.net or a SQL Server database. Switching to the Windows service is simple but you may need to put a [Serializable] attribute on the classes you put into session.. SignatureEliyahu Goldin, Software Developer Microsoft MVP [ASP.NET] http://msmvps.com/blogs/egoldin http://usableasp.net > Probably you are right. Do you mean that I need to try web service? Or > there are other ways also? [quoted text clipped - 12 lines] >>>memory. I call each time 'Page unload' when I load new page but never >>>when I close it. I did today search for session out of state on Microsoft site and found site http://msdn2.microsoft.com/en-us/library/ms972429.aspx However not studio 2005, nor Orcas can accept code <configuration> <sessionstate Not in XP, neither in server 2003. It means that at least at this time I cannot use this code. Probably the best solution is to reopen dataset each time when I load new page. Probably also to keep this code in separate web service which will return only datatable or datarow. As I remember from my past experince web service cannot keep values when I go from one page to another. This way I loose the essential of dataset. I put attention to another thing. I put in the corner of screen task manager, so I was able to watch how much memory I need. I used 2 pages. First page plain asp code, second initialize dataset, can abandon session if I want and to return to the first page. When I load first page the memory grew up to 60mb. Second page sometimes added 2-5mb, sometimes nothing. Memory reduced it size very rare. If I did long break between loading of first page it could increase memory up to 10mb (Even i did not allocate there any variable). This way I increse memory up to 130mb. The same code in asp 1.0 takes only 14mb. It means that garbage collection does not work is it suppose to be. > Minimizing session using and disposing variables is an architectural > decision. [quoted text clipped - 20 lines] >>>>did not release memory. I call each time 'Page unload' when I load new >>>>page but never when I close it. One question more. i think it is very important. Assume class has private dataset and public rowset. Now. When I put this object into collection (in my case session) what do I really put inside collection. If I put object itself, this is really huge demand to the memory. But if I put reference then this is no matter how large object is. However question may be put differently. In what address space does object exist. If to be placed into session it should exist in session then it will be better to create web service. But even in this case I not sure that when I put object which refers to web service into session I will not put into session the whole staff. > I did today search for session out of state on Microsoft site and found site > http://msdn2.microsoft.com/en-us/library/ms972429.aspx [quoted text clipped - 43 lines] > >>>>did not release memory. I call each time 'Page unload' when I load new > >>>>page but never when I close it. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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