w3wp.exe占用CPU超过50%的处理

1.查看CPU占用高的进程：任务管理器

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打开dump文件(File

\ Open Crash Dump)

3.输入命令!analyze

-v，等待几秒后会打印出错误信息，函数调用栈如下图：

参考方法：

我们经常遇到w3wp.exe进程的CPU占用率在某一时间段内突然升高几倍，但是无论使用adplus.vbs还是debug

dialog去抓取这一瞬间的dump都是有难度的。而且遇到高cpu的问题我们通常抓取一个dump不能看出问题，需要多个样例。

就能够很好的处理这个情况：

procdump -ma -c 50

-s 3 -n 2 5844(Process Name or PID)-ma将整个进程的内存信息写入dump。默认包含thread和handle信息-c在CPU到达多少的时候抓取-s持续多少秒后抓取 (default is

10).

-n抓几次-6464bit的w3wp.exe要用这个-e 当进程遇到unhandled

exception的时候-r Server 2008 R2支持的，clone一个process来做dump，减少因为抓dump而使w3wp挂起的时间

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