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dotnet-process-memory-dumps.md

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Search .NET memory dumps for memory issues

Collect memory

You may use any tool which works for the native process.

Other option is to use the minidumper tool from Sasha Goldshtein:

FIXME

For a GC heap snapshot use a perfview snapshot:

perfview heapsnapshot <pid|name>

Analyse collected snapshots

Using perfview (dumps and snapshots)

You may convert a memory dump file to perfview snapshot using PerfView HeapSnapshotFromProcessDump ProcessDumpFile [DataFile].

For further steps check perfview excellent help. FIXME: analysis example

Using windbg (dumps only)

windbg -z <dump-file>

Make sure that bitness of the dump matches bitness of the debugger.

When dump was not taken with a full memory you may receive an error similar to the one below:

0:000> .loadby sos clr
The call to LoadLibrary(d:\symbols\mss\clr.dll\4DA3FDF5670000\sos) failed, Win32 error 0n126
    "The specified module could not be found."
Please check your debugger configuration and/or network access.

You can then try loading psscor4 but still many commands won't be working.

Identify object which used most of the memory using !DumpHeap -stat.

Load necessary plugins:

.load procdumpext
!loadsos
!loadsosex (or .load sosex)

SOS commands:

!EEHeap [-gc] [-loader]
!HeapStat [-inclUnrooted | -iu]

!DumpHeap [-stat]
          [-strings]
          [-short]
          [-min <size>]
          [-max <size>]
          [-live]
          [-dead]
          [-thinlock]
          [-startAtLowerBound]
          [-mt <MethodTable address>]
          [-type <partial type name>]
          [start [end]]

!ObjSize [<Object address>]
!GCRoot [-nostacks] <Object address>
!DumpObject <address> | !DumpArray <address> | !DumpVC <mt> <address>

SOSEX commands:

!bhi (build heap index) !lhi <file> (load heap index) !chi (close heap index)

!mdt [typename | paramname | localname | MT] [ADDR] [-r[:level]] [-e[:level]]

!mroot
!refs <ObjectAddr> [-target|-source]

!gch [-HandleType]

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