分享程序员开发的那些事...
更新时间：2023-01-11 18:53:56
我目前没有专家来这里，但一些更多的信息，可能是有用的：
根据这个，GC线程对CLR启动时创建的，至少为服务器的GC，这样 没有足够的线程的GC运行是可能甚至没有可能; - ）
在的GC列中的已禁用 螺纹21只是意味着它决定 以不是由最终的GC pemted $ P $ 操作。这happends当 上线code决定，这是 这样做的一个关键的操作， 不应利用GC被干扰（像 装载和组装，因此融合）。
从KB命令的输出我会
猜你实际使用的
服务器GC（的StackFrame
！mscorwks SVR :: gc_heap :: make_heap_segment;
工作站GC将有什么
与类/命名空间WKS）。
这并不意外，因为它应该
是默认的服务器上
操作系统的系统。你应该确保这个用！eeversion命令。
另外，你应该找出你有多少个内核有，因为如果服务器GC运行，
它会使用尽可能多的线程（每个逻辑/物理内核之一）。
莫非，定时器被烧成pretty的时候，或比pvious 1完成时$ P $更快。您可以使用！线程池命令获得线程池线程使用的概述。
此外，您可能要检查的实际参数的方法和当地人（！clrstack -A）和/或在堆栈上当前对象（！DSO）。也许这可以摆脱一些更多的光。
由于胡乱猜测，一些使用Google的System.Net.ConnectionPool.CleanupCallbackWrapper产生以下链接，也许这可能是你的问题？
A production server has an application running 24x7, and sometimes it starts consuming near 50% of CPU. I couldn't reproduce it locally, but I did a Memory Dump with adplus. The server has Windows 2008 Server 64bits, .NET 3.5. The application listens to a MSMQ and has a thread pool to execute operations, when I did the memory dump it was supposed to be running nothing, but it was still consuming CPU.
Below is the Dump. Do you know what can be happening?? It's weird that the slow thread also says GC Disabled! What's that?
It's weird I've an ASP.NET app in the same server and sometimes happens the same thing.
0:000> !threads
ThreadCount: 23
UnstartedThread: 0
BackgroundThread: 6
PendingThread: 0
DeadThread: 5
Hosted Runtime: no
PreEmptive Lock
ID OSID ThreadOBJ State GC GC Alloc Context Domain Count APT Exception
0 1 1ec0 0000000000249c10 a020 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA
2 2 84c 0000000000253470 b220 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA (Finalizer)
3 3 10b8 0000000019d0f900 80a220 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA (Threadpool Completion Port)
5 4 2184 0000000019d4a550 880b220 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA (Threadpool Completion Port)
6 6 14a0 0000000019d602a0 180b220 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA (Threadpool Worker)
8 7 490 0000000019d7db70 200b020 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA
9 8 2164 0000000019dae680 200b020 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA
10 9 ac0 0000000019db4740 200b020 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA
11 a 24cc 0000000019db51f0 200b020 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA
12 b 1fb4 0000000019db5ca0 200b020 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA
13 c 2408 0000000019db1520 200b020 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA
14 d 1b44 0000000019db1fd0 200b020 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA
15 e 1280 0000000019db2a80 200b020 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA
16 f 206c 0000000019db8780 200b020 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA
17 10 1ff8 0000000019db9230 200b020 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA
18 11 2548 0000000019dc2120 200b020 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA
20 18 2588 0000000019dc49d0 180b220 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 MTA (Threadpool Worker)
21 1a 20a0 0000000019dc5570 b220 Disabled 0000000001653d88:0000000001655978 00000000002410b0 1 MTA
XXXX 26 0 0000000019dc89c0 9820 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 Ukn
XXXX 2c 0 0000000019dc5b40 9820 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 Ukn
XXXX 2b 0 0000000019dc3290 9820 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 Ukn
XXXX 5 0 0000000019dc8f90 9820 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 Ukn
XXXX 27 0 0000000019dc7850 9820 Enabled 0000000000000000:0000000000000000 00000000002410b0 0 Ukn
0:000> !runaway
User Mode Time
Thread Time
**21:20a0 0 days 0:27:21.718**
6:14a0 0 days 0:00:01.921
18:2548 0 days 0:00:01.015
2:84c 0 days 0:00:00.890
(18 more....)
0:000> ~21s
*** WARNING: Unable to verify checksum for System.ni.dll
mscorwks!JIT_WriteBarrier_Fast+0x3:
000007fe`f88de5c3 4881fa607f4701 cmp rdx,1477F60h
0:021> !clrstack
OS Thread Id: 0x20a0 (21)
*** WARNING: Unable to verify checksum for mscorlib.ni.dll
Child-SP RetAddr Call Site
000000001b05f090 000007fef651b1ba System.Net.TimerThread+TimerNode..ctor(Callback, System.Object, Int32, System.Object)
000000001b05f0d0 000007fef69a0c3f System.Net.TimerThread+TimerQueue.CreateTimer(Callback, System.Object)
000000001b05f180 000007fef651b73e System.Net.ConnectionPool.CleanupCallbackWrapper(Timer, Int32, System.Object)
000000001b05f1d0 000007fef651b560 System.Net.TimerThread+TimerNode.Fire()
000000001b05f2a0 000007fef64e6388 System.Net.TimerThread+TimerQueue.Fire(Int32 ByRef)
000000001b05f330 000007fef271175b System.Net.TimerThread.ThreadProc()
000000001b05f400 000007fef27a95fd System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
000000001b05f450 000007fef88e1552 System.Threading.ThreadHelper.ThreadStart()
0:021> kb
RetAddr : Args to Child : Call Site
000007fe`f6a1b87e : 00000000 (Edited) : mscorwks!JIT_WriteBarrier_Fast+0x3
000007fe`f651b1ba : 00000000 (Edited) : System_ni+0x70b87e
000007fe`f69a0c3f : 00000000 (Edited) : System_ni+0x20b1ba
000007fe`f651b73e : 000007fe (Edited) : System_ni+0x690c3f
000007fe`f651b560 : 00000000 (Edited) : System_ni+0x20b73e
000007fe`f64e6388 : 00000000 (Edited) : System_ni+0x20b560
000007fe`f271175b : 00000000 (Edited) : System_ni+0x1d6388
000007fe`f27a95fd : 00000000 (Edited) : mscorlib_ni+0x2f175b
000007fe`f88e1552 : 00000000 (Edited) : mscorlib_ni+0x3895fd
000007fe`f877e5e3 : 00000000 (Edited) : mscorwks!CallDescrWorker+0x82
000007fe`f878c83f : 00000000 (Edited) : mscorwks!CallDescrWorkerWithHandler+0xd3
000007fe`f887ae8d : 00000000 (Edited) : mscorwks!MethodDesc::CallDescr+0x24f
000007fe`f8839374 : 00000000 (Edited) : mscorwks!ThreadNative::KickOffThread_Worker+0x191
000007fe`f8732045 : 00000000 (Edited) : mscorwks!TypeHandle::GetParent+0x5c
000007fe`f8846139 : 00000000 (Edited) : mscorwks!SVR::gc_heap::make_heap_segment+0x155
000007fe`f8700e15 : 00000000 (Edited) : mscorwks!ZapStubPrecode::GetType+0x39
000007fe`f8700ae7 : 00000000 (Edited) : mscorwks!ThreadNative::KickOffThread+0x401
000007fe`f88614fc : 00000002 (Edited) : mscorwks!ThreadNative::KickOffThread+0xd3
00000000`76bdbe3d : 00000000 (Edited) : mscorwks!Thread::intermediateThreadProc+0x78
00000000`76d16a51 : 00000000 (Edited) : kernel32!BaseThreadInitThunk+0xd
I'm by far no expert here, but some more information that might be useful:
According to this, GC threads are created on CLR startup, at least for server GC, so not having enough threads for a GC run is possibly not even possible ;-)
The "Disabled" in the "GC" column of thread 21 just means that it decided to not be preemted by an eventual GC operation. This happends when the code on thread decides that it is doing a critical operation that should not be disturbed by a GC (like loading and assembly, hence fusion).
From the "kb" command output I would
guess that you are actually using the
server GC (stackframe
"mscorwks!SVR::gc_heap::make_heap_segment";
workstation GC would have something
with the class/namespace "WKS").
This is not unexpected as it should
be the default on a "server
operating" system. You should make sure about this using the "!eeversion" command.
Additionally you should find out how many cores you have, because if the server GC runs,
it will use as many threads (one per logical/physical core).
Could it be, that the timer is firing pretty often, or faster than the previous one is finished. You can get an overview of threadpool thread usage using the "!ThreadPool" command.
Also, you might want to check the actual arguments to the methods and locals (!clrstack -a) and/or the current objects on the stack (!dso). Maybe that can shed some more light.
As wild guess, some googling for "System.Net.ConnectionPool.CleanupCallbackWrapper" yield the following links, maybe that could be your problem?