我正在尝试查找我的应用程序中为什么会存储一个字符串这么长,导致过多的内存消耗。我有一个定期运行的Windows服务。
它从数据库(以DataSet形式)读取数据,然后进行一些处理 - 全部由.NET管理。
Windows服务每5分钟触发一次,进行交叉引用。数据集的每一行最坏情况下不应该超过一秒钟!
在某个阶段,即使没有可处理的数据,私有字节> 1.2GB。没有全局变量,并且所有处理都在各个方法内完成。
我拍了一个快照,并使用WinDbg进行了处理。以下是结果:
0:000> !dumpheap -min 85000
Address MT Size
02027f40 00166620 101432 Free
28411000 79330b24 536870936
48c11000 79333594 226273040
08411000 79330b24 452546504
total 4 objects
Statistics:
MT Count TotalSize Class Name
00166620 1 101432 Free
79333594 1 226273040 System.Byte[]
79330b24 2 989417440 System.String
Total 4 objects
所以我们要找出导致问题的两个字符串:
0:000> !dumpheap -mt 79330b24 -min 85000
Address MT Size
28411000 79330b24 536870936
08411000 79330b24 452546504
total 2 objects
Statistics:
MT Count TotalSize Class Name
79330b24 2 989417440 System.String
Total 2 objects
现在我想找出这两个变量的位置,但是当我使用! gcroot时,它没有返回任何结果:
0:000> !gcroot 28411000
Note: Roots found on stacks may be false positives. Run "!help gcroot" for
more info.
Scan Thread 0 OSTHread 2970
Scan Thread 2 OSTHread 2ab4
Scan Thread 3 OSTHread 12ac
Scan Thread 4 OSTHread 1394
Scan Thread 5 OSTHread 1b78
Scan Thread 8 OSTHread 1364
Scan Thread 9 OSTHread 226c
Scan Thread 10 OSTHread 1694
0:000> !gcroot 08411000
Note: Roots found on stacks may be false positives. Run "!help gcroot" for
more info.
Scan Thread 0 OSTHread 2970
Scan Thread 2 OSTHread 2ab4
Scan Thread 3 OSTHread 12ac
Scan Thread 4 OSTHread 1394
Scan Thread 5 OSTHread 1b78
Scan Thread 8 OSTHread 1364
Scan Thread 9 OSTHread 226c
Scan Thread 10 OSTHread 1694
我不明白我做错了什么,或者为什么找不到字符串的根。我已经对它执行了!do操作,但它只是说这些字符串无法打印:
0:000> !do 28411000
Name: System.String
MethodTable: 79330b24
EEClass: 790ed65c
Size: 536870930(0x20000012) bytes
(C:\WINDOWS\assembly\GAC_32\mscorlib\2.0.0.0__b77a5c561934e089\mscorlib.dll)
String: <String is invalid or too large to print>
Fields:
MT Field Offset Type VT Attr Value Name
79332d70 4000096 4 System.Int32 0 instance 268435457 m_arrayLength
79332d70 4000097 8 System.Int32 0 instance 226273026 m_stringLength
79331804 4000098 c System.Char 0 instance 57 m_firstChar
79330b24 4000099 10 System.String 0 shared static Empty
>> Domain:Value 00159f38:01021198 <<
79331754 400009a 14 System.Char[] 0 shared static WhitespaceChars
>> Domain:Value 00159f38:010217d4 <<
并且
0:000> !do 08411000
Name: System.String
MethodTable: 79330b24
EEClass: 790ed65c
Size: 452546502(0x1af94fc6) bytes
(C:\WINDOWS\assembly\GAC_32\mscorlib\2.0.0.0__b77a5c561934e089\mscorlib.dll)
String: <String is invalid or too large to print>
Fields:
MT Field Offset Type VT Attr Value Name
79332d70 4000096 4 System.Int32 0 instance 226273243 m_arrayLength
79332d70 4000097 8 System.Int32 0 instance 226273242 m_stringLength
79331804 4000098 c System.Char 0 instance 45 m_firstChar
79330b24 4000099 10 System.String 0 shared static Empty
>> Domain:Value 00159f38:01021198 <<
79331754 400009a 14 System.Char[] 0 shared static WhitespaceChars
>> Domain:Value 00159f38:010217d4 <<
有人能帮帮忙吗?
--
更新:
!eeheap -gc
Number of GC Heaps: 1
generation 0 starts at 0x01175764
generation 1 starts at 0x011756dc
generation 2 starts at 0x01021000
ephemeral segment allocation context: none
segment begin allocated size
01020000 01021000 0117b770 0x0015a770(1419120)
Large object heap starts at 0x02021000
segment begin allocated size
02020000 02021000 02040d88 0x0001fd88(130440)
28410000 28411000 48411018 0x20000018(536870936)
48c10000 48c11000 563db710 0x0d7ca710(226273040)
08410000 08411000 233a5fc8 0x1af94fc8(452546504)
Total Size 0x488d9be8(1217240040)
------------------------------
GC Heap Size 0x488d9be8(1217240040)
更新2:我删除了关于XML的引用,因为这个特定的程序不处理XML - 这是我的错误。
更新3:
这里是使用psscor2.dll的结果
0:000> !heapstat -inclUnrooted
Heap Gen0 Gen1 Gen2 LOH
Heap0 32780 68316 1324728 1217845888
Free space: Percentage
Heap0 12 67212 59764 101640 SOH: 8% LOH: 0%
Unrooted objects: Percentage
Heap0 2684 1104 757416 1217715448 SOH: 53% LOH: 99%