IIS - w3wp.exe (ASP .Net) eating memory

Asked By venom00

17-Nov-09 05:59 PM

Hello, i'm on a VPS with Windows 2003 x64 (IIS 6.0 so) and i have a
serious problem with w3wp.exe. It starts from 60 Mb and then grows
until the whole avaiable RAM is used.

http://img32.imageshack.us/img32/4120/w3wpgraph.png

Here is an example image showing w3wp.exe private bytes and Gen 0 Heap
size. They seems related, but if I use ".NET CLR Memory/# Bytes in all
Heaps " it is much lower than private bytes. Can we still say that is
an ASP .Net problem?

Moreover analyzing a crash dump the heap size i obtain is smaller, 200
Mb while the crash dump was 700 mb and private bytes about 600 mb.

http://pastebin.com/m6c448c9d

Here is also a !dumpheap -stat:

http://pastebin.com/m7fd72aa

I have done a "!dumpheap -mt 000006427881aaf8" (the System.String entry)
and I have found that the bigger strings are aspx pages. I have a lot of
them on my website (thousands). Maybe w3wp.exe is caching them? How
can i disable this feature?
!gcroot on one of this strings gives the following output:

http://pastebin.com/m15545adc

Does this mean it is orphaned but not collected by the GC?

Here is a "!dumpheap -stat -type Cach":

http://pastebin.com/m2955d688

And a !do and a !gcroot of a CacheEntry:

http://pastebin.com/f38df0a24


If you need it, I can also give you the link to the whole dump. I have
been working on it for a week without results!

Thanks in advance,
Carl

17-Nov-09 02:57 PM

***canned wrong-newsgroup reply************************
There was no way for you to know it (except maybe by browsing through some
of the previous questions in this newsgroup before posting yours - always a
recommended practice) , but this is a classic (COM-based) asp newsgroup.
ASP.Net bears very little resemblance to classic ASP so, while you may be
lucky enough to find a dotnet-knowledgeable person here who can answer your
question, you can eliminate the luck factor by posting your question to a
group where those dotnet-knowledgeable people hang out. I suggest
microsoft.public.dotnet.framework.aspnet or the forums at www.asp.net.
******************************************************************
--
Microsoft MVP - ASP/ASP.NET - 2004-2007
Please reply to the newsgroup. This email account is my spam trap so I
do not check it very often. If you must reply off-line, then remove the