dump
Dump:
资源:
http://blogs.msdn.com/johan/archive/2007/11/26/getting-started-with-windbg-part-i.aspx
http://blogs.msdn.com/johan/archive/2007/11/26/getting-started-with-windbg-part-ii.aspx
More Command:
.load
!help
!sos .help
!threadpool
!threads
!clrstack
!dumpobject(!do)
!dumparray(!da)
!dumpstackobjet(!dso)
!dumpheap
一个具体运用说明:
当前系统出现内存增长严重,暂时猜测是由于缓存被过分使用造成。开始分析:
1. 找出有那些数据在缓存中
!dumpheap –type System.Web.Caching.Cache –stat
total 3064 objects
Statistics:
MT Count TotalSize Class Name
6639de3c 1 12 System.Web.Caching.CacheKeyComparer
6639dc9c 1 24 System.Web.Caching.CacheMultiple
6639d878 2 24 System.Web.Caching.Cache
6639d978 1 32 System.Web.Caching.CacheMemoryStats
6639dafc 1 36 System.Web.Caching.CacheMemoryTotalMemoryPressure
6639e100 2 40 System.Web.Caching.CacheUsage
6639d7a4 1 52 System.Web.Caching.CacheCommon
6639dbbc 1 60 System.Web.Caching.CacheMemoryPrivateBytesPressure
6639df10 2 64 System.Web.Caching.CacheExpires
6639ed0c 5 80 System.Web.Caching.CacheDependency+DepFileInfo
6639dd2c 2 152 System.Web.Caching.CacheSingle
6639ebb8 9 324 System.Web.Caching.CacheDependency
6639e3fc 1019 20380 System.Web.Caching.CacheKey
6639d6b8 1005 32160 System.Web.Caching.CacheItemRemovedCallback
6639e4c0 1012 72864 System.Web.Caching.CacheEntry
Total 3064 objects
2.
继续查看6639d878
0:014> !dumpheap -mt 6639d878
Address MT Size
01574004 6639d878 12
015f7cd8 6639d878 12
total 2 objects
Statistics:
MT Count TotalSize Class Name
6639d878 2 24 System.Web.Caching.Cache
Total 2 objects
2. 查看Cache内对象大小:
0:014> !objsize 6639d878
6639d878 is not a valid object.
0:014> !objsize 01574004
sizeof(01574004) = 702840 ( 0xab978) bytes (System.Web.Caching.Cache)
3. 缓存中到底存什么了?
缓存的东西在System.Web.Caching.CacheEntry中。
0:014> !dumpheap -mt 6639e4c0
Address MT Size
0157685c 6639e4c0 72
01583b4c 6639e4c0 72
0158ddd4 6639e4c0 72
0158f02c 6639e4c0 72
015cba10 6639e4c0 72
015d0ea4 6639e4c0 72
015fe940 6639e4c0 72
01602c60 6639e4c0 72
0161f84c 6639e4c0 72
016f2f60 6639e4c0 72
016f3270 6639e4c0 72
01720ca8 6639e4c0 72
01721ecc 6639e4c0 72
017225fc 6639e4c0 72
017227bc 6639e4c0 72
0172285c 6639e4c0 72
017228fc 6639e4c0 72
01722abc 6639e4c0 72
01722b5c 6639e4c0 72
01722bfc 6639e4c0 72
total 1012 objects
Statistics:
MT Count TotalSize Class Name
6639e4c0 1012 72864 System.Web.Caching.CacheEntry
那么每个CacheEntry中存的是什么呢?
使用命令!dumpobject
!do 01722bfc
0:014> !do 01722bfc
Name: System.Web.Caching.CacheEntry
MethodTable: 6639e4c0
EEClass: 6639e448
Size: 72(0x48) bytes
(C:\Windows\assembly\GAC_32\System.Web\2.0.0.0__b03f5f7f11d50a3a\System.Web.dll)
Fields:
MT Field Offset Type VT Attr Value Name
790fd8c4 40013ef 4 System.String 0 instance 01722ba4 _key
79101e20 40013f0 c System.Byte 1 instance 34 _bits
79102290 40013f1 8 System.Int32 1 instance -842352759 _hashCode
790fd0f0 40013f8 10 System.Object 0 instance 01722bb8 _value
7910c878 40013f9 1c System.DateTime 1 instance 01722c18 _utcCreated
7910c878 40013fa 24 System.DateTime 1 instance 01722c20 _utcExpires
7911228c 40013fb 2c System.TimeSpan 1 instance 01722c28 _slidingExpiration
79101e20 40013fc d System.Byte 1 instance 1 _expiresBucket
6639e5fc 40013fd 34 ...g.ExpiresEntryRef 1 instance 01722c30 _expiresEntryRef
79101e20 40013fe e System.Byte 1 instance 2 _usageBucket
6639e6d8 40013ff 38 ...ing.UsageEntryRef 1 instance 01722c34 _usageEntryRef
7910c878 4001400 3c System.DateTime 1 instance 01722c38 _utcLastUpdate
6639ebb8 4001401 14 ...g.CacheDependency 0 instance 00000000 _dependency
790fd0f0 4001402 18 System.Object 0 instance 01722bd0 _onRemovedTargets
7910c878 40013f5 1e0 System.DateTime 1 shared static NoAbsoluteExpiration
>> Domain:Value 003c4888:NotInit 042f0e30:015768a4 <<
7911228c 40013f6 1e4 System.TimeSpan 1 shared static NoSlidingExpiration
>> Domain:Value 003c4888:NotInit 042f0e30:015768b4 <<
7911228c 40013f7 1e8 System.TimeSpan 1 shared static OneYear
>> Domain:Value 003c4888:NotInit 042f0e30:015768c4 <<
posted on 2007-12-23 18:36 flyingchen 阅读(729) 评论(0) 编辑 收藏 举报