windbg分析进程CPU占用

用Windbg Attach到目标进程，

通过!runaway命令来列出各线程所耗费的时间。占用时间最多的就是那些假死的线程了。

0:000> !runaway

 User Mode Time

  Thread       Time

   0:139c      0 days 0:15:16.443

   4:708       0 days 0:00:07.878

   5:1990      0 days 0:00:00.124

   6:784       0 days 0:00:00.031

   3:14d8      0 days 0:00:00.031

  15:9e0       0 days 0:00:00.015

  16:1b64      0 days 0:00:00.000

  14:ac4       0 days 0:00:00.000

  13:1318      0 days 0:00:00.000

  12:1c94      0 days 0:00:00.000

  11:194c      0 days 0:00:00.000

  10:9c8       0 days 0:00:00.000

   9:1618      0 days 0:00:00.000

   8:a54       0 days 0:00:00.000

   7:1b4c      0 days 0:00:00.000

   2:1e50      0 days 0:00:00.000

   1:a10       0 days 0:00:00.000

然后~*kb列出各线程的调用栈，分析一下耗费时间长的线程的调用栈基本可以找出问题所在的原因。

0:000> ~*kb

.  0  Id: de4.139c Suspend: 0 Teb: 7ffdf000 Unfrozen

ChildEBP RetAddr  Args to Child              

0012cc30 67711fe0 0d90fc38 0d90fc3c 0086cd64 msvcrt!memmove+0x5a

0012cc50 6771ee7c 06ee9600 06ecec00 00004d12 mshtml!CImplPtrAry::DeleteByValue+0x5c

0012cc68 6772d0b2 0033f1b0 0000001c 0033ed7c mshtml!CDoc::ReleaseUrlImgCtx+0x3e

0012cc8c 6772cfe7 00000004 00000000 06ee9600 mshtml!CElement::ReleaseImageCtxts+0x102

0012ccb4 676cae90 093d16e0 00000000 0012ccd8 mshtml!CElement::Passivate+0x218

0012ccc4 676cacfb 06ee9600 093d16e0 01719c78 mshtml!CBase::PrivateRelease+0x33

0012ccd8 71a3656a 06ee9600 0012cd0c 71a361d8 mshtml!CElement::PrivateRelease+0x40

0012cce4 71a361d8 00000000 0000003f 00919b78 jscript9!HostVariant::Dispose+0x52

0012ccf8 71a360f6 0091abb7 00919698 00919698 jscript9!HeapBucket::DisposeObjects+0x60

0012cd0c 71a360d0 00919b78 71a37091 fcc9732c jscript9!HeapInfo::DisposeObjects+0x1a

0012cd14 71a37091 fcc9732c 00919698 0165f150 jscript9!Recycler::FinishCollection+0x30

0012cd4c 71a34cb3 00000000 00000000 00000000 jscript9!Recycler::FinishConcurrentCollect+0x220

0012cd74 71a36b10 00919698 71a36f71 00000000 jscript9!ThreadContext::ExecuteRecyclerCollectionFunction+0x2a

0012cd94 7197819d 00000000 00918fe8 072d9dc0 jscript9!Recycler::FinishConcurrent+0x68

0012cdb4 719784e4 0165f150 00918fe8 0012cddc jscript9!ThreadContext::EnterScriptStart+0x9b

0012ce18 7197845a 00918fe8 00000001 025537e0 jscript9!Js::JavascriptFunction::CallRootFunction+0x6a

0012ce54 719783e6 00000000 0012ce84 00000001 jscript9!ScriptSite::CallRootFunction+0x4f

0012ce7c 719b12a1 072d9dc0 0012cea0 00000000 jscript9!ScriptSite::Execute+0x63

0012ceb0 71977fe8 072d4a40 00000000 00000000 jscript9!JavascriptDispatch::InvokeOnSelf+0x105

0012cf1c 71978140 072d4a44 00000000 00000000 jscript9!JavascriptDispatch::InvokeEx+0x268