ASP.NET Memory - How much are you caching? + an example of .foreach

re: ASP.NET Memory - How much are you caching? + an example of .foreach

karl — Thu, 26 Jan 2006 17:49:10 GMT

Wouldn't it be nice if we could hook into a static readonly Cache.TotalSize, Application.TotalSize and Session.TotalSize ??

Karl

re: ASP.NET Memory - How much are you caching? + an example of .foreach

Travis Owens — Thu, 26 Jan 2006 17:59:54 GMT

This post doesn't display well at 1024 width because of the fixed width no wrap fonts in your blue boxes, perhaps you should lower the font size 1 or 2 notches to be more 1024 width friendly.

PS: I'm a page layout coder, 1024x1280.

re: ASP.NET Memory - How much are you caching? + an example of .foreach

Tess — Thu, 26 Jan 2006 18:21:52 GMT

Hi Travis,

I'd be happy to change it, because i find it a bit annoying too that some boxes stretch way out on the right hand side... but unfortunately I know practically nothing about CSS:(

my css override for the blue sections look like this

pre.debug
{
font-family: Courier;
font-size: 6pt;
background-color: #99CCFF;
text-align:left;
}

but the 6pt seems to have no effect. If you have any hints on what i'm doing wrong, im all ears:) always interested in learning new stuff:)

re: ASP.NET Memory - How much are you caching? + an example of .foreach

Jonno — Wed, 15 Feb 2006 03:30:47 GMT

I see you've gone for font size="2" within the pre tag... If you want to use the font tag you could also try this in your CSS
pre.debug, pre.debug font
{
font-family: Courier;
font-size: 6pt;
background-color: #99CCFF;
text-align:left;
}
or was the font tag and size just a workaround anyway?
All that selector does is say you want to apply the style to elements matching either pre.debug or pre.debug font.

re: ASP.NET Memory - How much are you caching? + an example of .foreach

Tess — Wed, 15 Feb 2006 10:48:48 GMT

Hi Jonno,

The only difference i see between your tag and mine above is the additional ,pre.debug font

It doesnt seem like it makes a difference when i change it:(

Thanks
Tess

re: ASP.NET Memory - How much are you caching? + an example of .foreach

Howard — Fri, 17 Feb 2006 13:18:29 GMT

Hi Tess

One thing thats been bothering me for while is the difference between the output of !dumpheap on your posts to the one from the dumps I've got. Here's an example.

0:017> !dumpheap -type HttpRuntime
------------------------------
Heap 0
Address MT Size Gen
0x021d6160 0x01b89df4 116 2 System.Web.HttpRuntime
0x021dd8c0 0x021400c8 12 2 System.Web.Configuration.HttpRuntimeConfigurationHandler
0x021dd8cc 0x02140010 52 2 System.Web.Configuration.HttpRuntimeConfig
total 3 objects
------------------------------
Heap 1
Address MT Size Gen
total 0 objects
------------------------------
total 3 objects

Why do I have 2 heaps and you've only got 1? I'm aware of the large object heap, but Heap 1 isn't a large object heap because in another dump I've got there's objects of only 20K on it and I thought an object had to >1MB to make onto the large object heap.

BTW - I've found all your blogs to be of immense value while I'm trying to get my head round how to debug ASP.NET apps. Thanks.

re: ASP.NET Memory - How much are you caching? + an example of .foreach

Tess — Fri, 17 Feb 2006 15:02:08 GMT

Hi Howard,

In this particular post, the difference between our outputs with !dumpheap -type is that i am running this on a single processor machine while you are on a multiproc machine.

On single processor machines we run with the workstation version of the GC and only use one heap. On a multi-proc machine you would run the server version and have one heap per processor or if you run a hyperthreaded multiproc you would have 2 heaps per processor.

!dumpheap -type shows specifics for each heap. !dumpheap (without -type) doesnt specify per heap.

If you notice in some of my other posts where i am running !eeheap -gc (showing multiple heaps), i am running those samples on a multiproc machine.

!eeversion will show you which runtime version you are running and how many heaps it is using.

Hope this clarifies things...

Tess

re: ASP.NET Memory - How much are you caching? + an example of .foreach

Jonno — Mon, 20 Feb 2006 08:55:20 GMT

Hokay,
How about this for a suggestion then...
You've specified Courier as the font-family. Unfortunately my system doesn't have Courier on it so my browser substitutes Courier New every time that Courier should be applied.
And then it doesn’t apply your specified font sizing unless the calculated font size is greater than 1em. I don’t know why.
Anyway, try this as a fix. Replace this line in pre.debug
font-family: Courier;
with
font-family: 'Courier New', Courier, Fixed, monospace;

Then you should see the font-size rule make a difference.

And given that you have ditched the font tag then you can also ditch the ', pre.debug font' selector too.

cheers,
Jonno

PS Thanks for the posts - mostly over my head but still awesome!

re: ASP.NET Memory - How much are you caching? + an example of .foreach

Tess — Mon, 20 Feb 2006 10:16:29 GMT

Thank you very much Jonno, really appreciate the help...

That seemed to do the trick:) I've now been able to change it to 8pt which is about as low as i can go and still have it readable.

You learn something new every day...

re: ASP.NET Memory - How much are you caching? + an example of .foreach

Steve — Wed, 22 Mar 2006 02:53:12 GMT

I'm a little confused by the demo in your post. You show us with the .foreach command that there is a cache object for each runtime but then when you demo the !dumpaspnetcache -stat it only list one group of objects. Are those all objects in all cache objects or only the objects in the first cache?

re: ASP.NET Memory - How much are you caching? + an example of .foreach

Tess — Wed, 22 Mar 2006 09:31:58 GMT

Hi Steve,

In this particular sample there was only one application so only one cache, if there would have been more than one cache all objects from all caches would have been listed with the !dumpaspnetcache -stat command

ASP.Net Quick Tips - Caching

Ancora Imparo — Wed, 07 Mar 2007 16:02:36 GMT

This is part four in the ASP.Net tips series . In particular, this is a follow-up to, " ASP.Net Quick

re: ASP.NET Memory - How much are you caching? + an example of .foreach

Jason Brown — Fri, 09 Mar 2007 02:52:56 GMT

In the .Net from 2.0 there is no !dumpaspnetcache command. Do you know if its called something different now, or if there is a way to do something similar?

re: ASP.NET Memory - How much are you caching? + an example of .foreach

Tess — Fri, 09 Mar 2007 11:23:56 GMT

Hi Jason,

There isn't a !dumpaspnetcache command yet in 2.0 so the only way you can do it is through manually dumping out hte contents of System.Web.Caching.Cache but a few common tasks so you dont have to run though the whole ordeal of dumping it out, would be to do the following

1. Find the System.Web.Caching.Cache MT in !dumpheap -stat

2. !dumpheap -mt on that MT

3. !objsize on the objects so that you can see how much you are saving in cache

For session state, find the MT for the InProcSessionState objects and run

.foreach (Session {!dumpheap -mt <MT> -short}){!objsize ${Session}}

Which will give you the size of the individual Sessions and then from there you can drill down into the particular session object that is causing you grief.

Hope this helps,

Tess

ASP.NET Memory Investigation

If broken it is, fix it you should — Mon, 13 Aug 2007 17:54:24 GMT

This is a bit of a continuation of ASP.NET Memory Issue: High memory usage in a 64bit w3wp.exe process

How I lost my WinDbg virginity

LavaBlast Software Blog — Thu, 13 Mar 2008 17:31:17 GMT

How I lost my WinDbg virginity

re: ASP.NET Memory - How much are you caching? + an example of .foreach

shivakrishna.k — Wed, 04 Jun 2008 16:48:55 GMT

Hi Tess,

I am very much new to debugging and learning how to debug only by reading your blog. I will greatly apreciate your help. I got the memory dump of w3wp using ADplus. But when I type "!dumpobj poi(22d2f00+4c)" to get the string at the address windbg is giving an error saying invalid parameter. I copied sos.dll to debuggers folder from framework folder. I am using latest version(6.9.0003.113) of windbg.I googled for the solution for 2 days but no luck. Please help me in solving this problem. Thanks in advance.

Shiva

re: ASP.NET Memory - How much are you caching? + an example of .foreach

Tess — Wed, 04 Jun 2008 16:58:56 GMT

Not sure I follow,

What is at address 22d2f00 and what is at offset 4c?

I.e. what would you get if you did !do 22d2f00