w3wp.exe占用CPU超過50%的處理

1.查看CPU占用高的進程：任務管理器

C:\Documents and

Settings\Administrator>iisapp

W3WP.exe PID: 18008?AppPoolId: STAT

W3WP.exe PID: 8328?AppPoolId: STAT

W3WP.exe PID: 17868?AppPoolId: JYCV16

W3WP.exe PID: 16652?AppPoolId: JYCONLINE

W3WP.exe PID: 1248?AppPoolId: MAIL

C:\Documents and

Settings\Administrator>E:\soft\Procdump\procdump.exe?-ma -c

50

-s 3 -n 2

17868

ProcDump v7.1 - Writes process dump files

Copyright (C) 2009-2014 Mark Russinovich

Sysinternals - www.sysinternals.com

With contributions from Andrew Richards

Process:?w3wp.exe (17868)

CPU

threshold:?>= 50% of system

Performance counter:?n/a

Commit

threshold:?n/a

Threshold

seconds:?3

Hung window

check:?Disabled

Log debug

strings:?Disabled

Exception

monitor:?Disabled

Exception

filter:?*

Terminate

monitor:?Disabled

Cloning

type:?Disabled

Concurrent

limit:?n/a

Avoid

outage:?n/a

Number of

dumps:?2

Dump

folder:?C:\Documents and Settings\Administrator\

Dump

filename/mask:?PROCESSNAME_YYMMDD_HHMMSS

Press Ctrl-C to end monitoring without terminating the

process.

[16:25:34] CPU: 75% 1s

[16:25:35] CPU: 72% 2s

[16:25:36] CPU: 76% 3s (Trigger)

[16:25:36] Dump 1 initiated: C:\Documents and

Settings\Administrator\w3wp.exe_16

0110_162536.dmp

[16:25:40] Dump 1 complete: 153 MB written in 3.4

seconds

[16:25:42] CPU: 75% 1s

[16:25:43] CPU: 74% 2s

[16:25:44] CPU: 80% 3s (Trigger)

[16:25:44] Dump 2 initiated: C:\Documents and

Settings\Administrator\w3wp.exe_16

0110_162544.dmp

[16:25:44] Dump 2 complete: 173 MB written in 0.4

seconds

[16:25:45] Dump count reached.

C:\Documents and

Settings\Administrator>iisapp

W3WP.exe PID: 18008?AppPoolId: STAT

W3WP.exe PID: 8328?AppPoolId: STAT

W3WP.exe PID: 17868?AppPoolId: JYCV16

W3WP.exe PID: 16652?AppPoolId: JYCONLINE

W3WP.exe PID: 1248?AppPoolId: MAIL

W3WP.exe PID: 11948?AppPoolId: TOPWOM

W3WP.exe PID: 6268?AppPoolId: jvm

C:\Documents and Settings\Administrator>

2.用WiinDbg打開dump文件(File

\ Open Crash Dump)

3.輸入命令!analyze

-v，等待幾秒后會打印出錯誤信息，函數調用棧如下圖：

參考方法：

我們經常遇到w3wp.exe進程的CPU占用率在某一時間段內突然升高幾倍，但是無論使用adplus.vbs還是debug

dialog去抓取這一瞬間的dump都是有難度的。而且遇到高cpu的問題我們通常抓取一個dump不能看出問題，需要多個樣例。

就能夠很好的處理這個情況：

procdump -ma -c 50

-s 3 -n 2 5844(Process Name or PID)-ma將整個進程的內存信息寫入dump。默認包含thread和handle信息-c在CPU到達多少的時候抓取-s持續多少秒后抓取 (default is

10).

-n抓幾次-6464bit的w3wp.exe要用這個-e 當進程遇到unhandled

exception的時候-r Server 2008 R2支持的，clone一個process來做dump，減少因為抓dump而使w3wp掛起的時間

0:121:x86> ~108s

The wow64exts extension must be loaded to access 32-bit

state.

.load wow64exts will do this if you haven't loaded it

already.

ntdll!ZwQueryVirtualMemory+0xa:

0033:77b6154a

0:108:x86> ~121s

clr!CoInitializeEE+0x47df2:

74216664 81f904000080 ?cmp

ecx,80000004h

0:121:x86> k

總結

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