.NET Debugging Demos Lab 3: Memory

Link Listing - February 15, 2008

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MSBuild The custom MSBuild task cookbook [Via: bart ] ASP.NET Simplifying ASP.NET ListView Control...

Link Listing - February 15, 2008

Christopher Steen — Sat, 16 Feb 2008 16:01:43 GMT

Link Listing - February 15, 2008

Interesting Finds: February 16, 2008

Jason Haley — Sat, 16 Feb 2008 18:45:27 GMT

re: .NET Debugging Demos Lab 3: Memory

Aaron — Sun, 17 Feb 2008 12:31:48 GMT

Say you want to find the contents of a string, so you !do. What if you get an error saying the string it too large to display ? How can you determine the contents of the string ?

Cheers

Aaron

re: .NET Debugging Demos Lab 3: Memory

Tess — Mon, 18 Feb 2008 10:29:06 GMT

if sos deems it too large to display you can do

dc <address>+0xc

(which will dump out the characters at an offset 0xc from the string address, this is where the contents of the string start)

or you can try da <address>+0xc or du <address>+0xc

da = dump ascii, du = dump unicode

You can also do

dc <address>+0xc <address>+<size of string>

if you want to dump out the whole string, you will get the size from the !do output

re: .NET Debugging Demos Lab 3: Memory

baal — Tue, 19 Feb 2008 10:23:36 GMT

on my server, there are 10 w3wp.exe processes, when i add counters, "select instance from list box",in the list box there are w3wp.exe#1, w3wp.exe#2...., i can't figure out which is i want.

re: .NET Debugging Demos Lab 3: Memory

Tess — Tue, 19 Feb 2008 11:47:37 GMT

That's quite a few w3wp.exe processes:) you can run

tlist -c from the debuggers directory to get a list of all processes and their command lines to try to identify the pid and then check which w3wp corresponds to which pid under the process counter...

but you might as well just add the counters for all w3wp.exe processes and then based on the counters (like memory usage or cpu activity) you can probably figure out which one it is...

re: .NET Debugging Demos Lab 3: Memory

baal — Wed, 20 Feb 2008 04:45:48 GMT

add the counters for all w3wp.exe processes

----there are too many info got, i can't analyze them,it is too dificult for me. your method can't work.

here i found a article: http://support.microsoft.com/kb/922775/en-us ,in last ,it write "Multiple CLR performance counters appear that have names that resemble "W3wp#1" " i follow this way, but i can't understand which represent the PID of w3wp.exe.

identify the pid of w3wp.exe between the .net counters and native counters are different. for native counters , do some modification on key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\PerfProc\Performance,

this is what i found on msdn

re: .NET Debugging Demos Lab 3: Memory

Tess — Wed, 20 Feb 2008 09:59:00 GMT

then try tlist and if that doesn't help then then next thing i would suggest is to either shut down the processes and just start one or do something like hit a page repetedly while watching task manager to see which one of them the CPU usage/memory usage moves for to find the pid.

.NET Debugging Demos Lab 4: High CPU Hang - Review

If broken it is, fix it you should — Wed, 27 Feb 2008 14:31:28 GMT

Hope you have had a chance to go through the high CPU lab... Some people already commented with the solution

.NET Debugging Demos

Paul Mooney — Wed, 27 Feb 2008 14:47:13 GMT

Lab 1: HangLab 2: CrashLab 3: MemoryLab 4: High CPU Hang

re: .NET Debugging Demos Lab 3: Memory

baal — Fri, 29 Feb 2008 09:29:40 GMT

" tlist -c " is useless for me! this command output is the same as the tab of processes in Debug Diagnostic tool. i installed Debug Diagnostic tool. I guess my server has native leak. on my server, there are a few w3wp.exe running. I can't stop the process and hit a page repetadly. the serve is production server on internet, many people will acess the web page.

re: .NET Debugging Demos Lab 3: Memory

baal — Fri, 29 Feb 2008 10:29:37 GMT

i got private bytes, virtual bytes for w3wp_6824 and and #Bytes in all heaps for w3wp#5, w3wp#5 is the no. 6824 process.(i do as http://support.microsoft.com/kb/922775/en-us 's say.)

but there are curves for private bytes, virtual bytes. but there is no curve for #Bytes in all heaps of w3wp#5. is it correct? ( the max, min, average value of #Bytes in all heaps of w3wp#5 are the same. no value for last ). the #Bytes in all heaps for _global_ has curve( the max, min, average,last value of #Bytes in all heaps of _global_ are exist and different)

re: .NET Debugging Demos Lab 3: Memory

Tess — Fri, 29 Feb 2008 11:17:42 GMT

The _global_ counters are not reliable. If you don't get values for #Bytes in all heaps for certain w3wp.exe processes it either means that you are not running the log as an admin (or someone with debug priviledges for the process) or the process is not serving .net content (most likely cause is probably a perms issue)

re: .NET Debugging Demos Lab 3: Memory

baal — Mon, 03 Mar 2008 10:20:15 GMT

yes,it is the priviledges problem, I set Change the "Run As:" from "<Default>" to administrator ,but no data collect, I set to "<Default>" is ok.

re: .NET Debugging Demos Lab 3: Memory

Michal — Tue, 03 Jun 2008 11:21:44 GMT

Hi,

Is there away to get the value of a .Net variable from a memory dump?

I known it's name, it is of type string and when running

!dumpheap -stat

I see that there are ~6000 strings on the heap...

Thank's.

re: .NET Debugging Demos Lab 3: Memory

Tess — Tue, 03 Jun 2008 12:22:15 GMT

Hi Michal,

You can't really search by variable name or even retreive the variable name from a memory dump in most cases, since once you compile the variable names are usually no longer in the process, they are only relevant for you as a coder. I.e. to the process what is relevant is addresses and instructions.

If however, you know that this is a member variable of another object, or you know that it is on a stack somewhere you might be able to get to it by dumping the stackobjects, dumping out all the statics, dumping out session variables or dumping out the parent class

.NET 调试实例 - 信息和安装说明 (原创翻译)

Justin — Mon, 07 Jul 2008 20:42:40 GMT

.NET调试实例

这是一个系列的调式实例，目的是为了帮助你在调式.NET应用程序中最常见的挂起(Hang)、性能(performance)、内存(memory)和系统崩溃(crash)方面获得一些...

re: .NET Debugging Demos Lab 3: Memory

J.W. — Thu, 18 Sep 2008 18:25:16 GMT

Hi, Tess,

Get a memory dump

1. Open a command prompt and move to the debuggers directory and type in "adplus -hang -pn w3wp.exe -quiet" and hit enter

Do we run it after tinyget returns or before tinyget returns?

Thanks,

re: .NET Debugging Demos Lab 3: Memory

Tess — Fri, 19 Sep 2008 09:33:25 GMT

in this one you can wait until tinyget returns

re: .NET Debugging Demos Lab 3: Memory

JanIvan Qian — Tue, 30 Dec 2008 09:45:50 GMT

Hi Tess, I'm using Vista Enterprise. But I couldn't follow you after running perfmon.exe in section "Set up a performance monitor log". I guess there may be some difference in Vista.

I have no idea how to move on cause I'm not familiar with performance counters. Could you please show me some light? Thanks :)

re: .NET Debugging Demos Lab 3: Memory

Tess — Wed, 07 Jan 2009 12:10:47 GMT

In Vista you would create a new data collector set instead. In perfmon this is located under data collector sets/user defined, right-click to create a new one and follow the wizard

HTH

Tess

Debug Diag script for troubleshooting .NET 2.0 Memory leaks

If broken it is, fix it you should — Tue, 12 May 2009 12:56:23 GMT

I have put together a quick and dirty debug diag script for troubleshooting .net memory leaks. (attached

re: .NET Debugging Demos Lab 3: Memory

Chris — Fri, 31 Jul 2009 17:16:30 GMT

Great site and great info. My company brought in the win32 native debugging and the advanced .net debugging courses and I took them both.

I'm looking at a high mem utilization problem, and I'm seeing 181250 finalizable objects in gen 2. I've been through a pretty fair number of dumps and have never seen this many objects in gen2, or any generation for that matter. We just started using WF for our page navigation and the top 10 (by count and mem usage) of finalizable objects are System.Workflow objects

38079 1675476 System.Workflow.Activities.IfElseBranchActivity

29112 1048032 System.Workflow.Activities.Rules.RuleConditionReference

Have you run across anything like this in Workflow scenarios?

re: .NET Debugging Demos Lab 3: Memory

Sundar Paranthaman — Thu, 01 Oct 2009 01:52:08 GMT

I am looking into the high number of SqlCeCommands in our application, when I dump the contents of SqlCeCommand in our applicaion, I see outputs like this. What does a HANDLE(WekSh) signify. It looks like that this could not cause memory leak, since the handle is weak it could be garbage collected based on the need.

DOMAIN(00000000000E5970):HANDLE(WeakSh):a425a8:Root:00000000032aef20(System.Data.SqlServerCe.SqlCeCommand)