Analyse Memory Dumps looking at .NET String types
- Create a Full Process Dump (e.g. in Task Manager, right-click on the process and click Create Dump File)
- Run the tool by executing the command line
HeapStringAnalyser.exe <Full path of the Process Dump> - You can also add the
--gcInfoargument to the cmd-line and you will get additional information about the GC Heaps
.NET Memory Dump Heap Analyser - created by Matt Warren - github.com/mattwarren
Found CLR Version: v4.6.1076.00
Dac already exists on the local machine at:
C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscordacwks.dll
Memory Region Information
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Type Count Total Size (MB)
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GCSegment 6 75.67
ReservedGCSegment 6 20.30
LowFrequencyLoaderHeap 246 16.10
HighFrequencyLoaderHeap 208 12.92
ResolveHeap 22 1.25
DispatchHeap 12 0.61
HandleTableChunk 8 0.50
StubHeap 10 0.47
CacheEntryHeap 7 0.29
IndcellHeap 6 0.21
LookupHeap 6 0.21
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GC Heap Information - Workstation
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Heap 0: 78,030,788 bytes (74.42 MB) in use
-----------------------------------------------------------
Type Size (MB) Committed (MB) Reserved (MB)
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Ephemeral 2.66 3.79 16.00
Gen2 16.00 16.00 16.00
Gen2 16.00 16.00 16.00
Gen2 16.00 16.00 16.00
Gen2 15.89 15.89 16.00
Large 7.88 8.00 16.00
-----------------------------------------------------------
Total (across all heaps): 78,030,788 bytes (74.42 MB)
-----------------------------------------------------------
"System.String" memory usage info
Overall 145,872 "System.String" objects take up 12,391,286 bytes (11.82 MB)
Of this underlying byte arrays (as Unicode) take up 10,349,078 bytes (9.87 MB)
Remaining data (object headers, other fields, etc) are 2,042,208 bytes (1.95 MB), at 14 bytes per object
Actual Encoding that the "System.String" could be stored as (with corresponding data size)
10,339,638 bytes ( 145,505 strings) as ASCII
3,370 bytes ( 65 strings) as ISO-8859-1 (Latin-1)
6,070 bytes ( 302 strings) as Unicode
Total: 10,349,078 bytes (expected: 10,349,078)
Compression Summary:
5,171,504 bytes Compressed (to ISO-8859-1 (Latin-1))
6,070 bytes Uncompressed (as Unicode)
145,872 bytes EXTRA to enable compression (1-byte field, per "System.String" object)
Total Usage: 5,323,446 bytes (5.08 MB), compared to 10,349,078 (9.87 MB) before compression
Total Saving: 5,025,632 bytes (4.79 MB)
Press any key to continue . . .