CLR 40 in Visual Studio .NET

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The output shows both how much memory is in use: 21MB in Gen 0, 134KB in Gen 1, 159KB in Gen 2, and finally 33KB in the LOH The free space indicates that there is 18MB available in Gen 0, and 12 and 36 in Gen 1 and Gen 2, respectively
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In 5, we described the process of finding out to which generation a particular object belonged The process involved dumping out the managed heap segments (using the eeheap command) and then matching the address of the object to one of the segments listed in the output (output specifies which generation each segment corresponds to) This process may work fine if you re only trying to find the generation of one or two objects, but any more than that and it becomes rather tedious Fortunately, SOS 40 introduces a command called GCWhere that displays information about the object passed in as an argument The syntax of the command is
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!GCWhere <object address>
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Here is an example of the output when ran against a FileStream object:
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0:000> !GCWhere 0x01efd3f8 Address Gen Heap segment 01efd3f8 0 0 01ea0000 begin 01ea1000 allocated 020f99cc size 0x50(80)
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The output shows the address of the object in question (0x01efd3f8), the generation to which the object belongs (Gen 0), the managed heap (0), the segment pointer (0x01ea0000), the starting address of the segment (0x01ea1000), number of bytes allocated on the segment (0x020f99c), and finally the size of the object (0x50) Please note that the size is not the recursive size (ie, does not include the size of child objects)
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The ListNearObj command can be used to validate the consistency of the heap The command takes an object address as an argument and attempts to validate both the object before and after the specified object The syntax of the command is shown here:
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!ListNearObj <object address>
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For example, running the ListNearObj against an object that is valid and is surrounded by valid objects yields the following output:
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0:000> !ListNearObj 0x01efd3f8 Before: 01efd3c8 48 (0x30) SystemCollectionsHashtable+bucket[] Current: 01efd3f8 80 (0x50) SystemIOFileStream After: 01efd448 28 (0x1c) SystemString Heap local consistency confirmed
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The output is broken down into the before, current, and after followed by the result of the validation The before, current, and after sections specify the object s address, size, and type In the preceding example, all three objects were considered valid and therefore the command considers the heap local consistency to be intact If, on the other hand, we run the command against an object that is corrupted (where the size of the object has been overwritten), we see the following output:
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0:000> !ListNearObj 0x01efd3f8 Before: 01efd3c8 48 (0x30) After: 01efd448 28 (0x1c) Heap local consistency not confirmed SystemCollectionsHashtable+bucket[] SystemString
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In 5, we took a look at a few sample applications that were developed in such a way to cause an out-of-memory exception to be thrown We also showed how we can analyze the managed heap to get more information as to the source of the out-ofmemory exception SOS 40 introduces a new command called AnalyzeOOM that helps in the out-of-memory diagnosis process The syntax for the command is shown here:
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!AnalyzeOOM
Let s use a small application called 10OOMexe to illustrate how the command can be used The 10OOMexe application simply sits in a tight loop and allocates large amounts of memory until the memory is exhausted Run the application under the debugger until the out-of-memory exception is thrown:
(2b14281c): C++ EH exception - code e06d7363 (first chance) (2b14281c): CLR exception - code e0434352 (first chance) ModLoad: 75370000 75378000 C:\Windows\system32\VERSIONdll Unhandled Exception: OutOfMemoryException (2b14281c): CLR exception - code e0434352 (!!! second chance !!!) eax=0030edc0 ebx=00000005 ecx=00000005 edx=00000000 esi=0030ee6c edi=003fa160