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Lots of .dmp files. Why? Value?

Last post 01-18-2019, 16:27 by Brian Fluet. 7 replies.
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  •  01-16-2019, 23:24

    • Brian Fluet is not online. Last active: 04-18-2019, 18:16 Brian Fluet
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    Lots of .dmp files. Why? Value?

    Hi All,

    Would someone please explain .dmp files? 

    • I have a significant number (at least one per month, sometimes several)
    • They're not readable with a text editor so I don't know their content or value
    • I don't know what is causing their creation but the time stamp of a small percentage of them corresponds with the daily maintenance task

    TIA!

  •  01-17-2019, 1:15

    • Rolf Lindby is not online. Last active: 2019-04-19, 14:58 Rolf Lindby
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    Re: Lots of .dmp files. Why? Value?

    .dmp files are memory dumps that can be loaded in Microsoft Visual Studio for debugging. They are created if the program terminates unexpectedly.

     

  •  01-17-2019, 2:05

    • Brian Fluet is not online. Last active: 04-18-2019, 18:16 Brian Fluet
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    Re: Lots of .dmp files. Why? Value?

    Thanks Rolf.  I don't have Visual Studio so will study the frequency a bit more for clues and to try to get a sense of whether there is cause for alarm.  Is there an explanation for the ones that are zero byte sized?  There is a number of those.
  •  01-17-2019, 14:51

    • Joerg is not online. Last active: 04-18-2019, 16:49 Joerg
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    AW: Re: Lots of .dmp files. Why? Value?

    Rolf Lindby:
    They are created if the program terminates unexpectedly.

    But the daily maintenance task should not be an unexpected termination, isn't it?

    We never used the daily maintenance because I have to restart our Windows Server anyhow at least once a month during MS update day. The other times Mercury is normally running incident-free. Nevertheless just searched for any dmp files but didn't find any.

  •  01-17-2019, 15:38

    • Brian Fluet is not online. Last active: 04-18-2019, 18:16 Brian Fluet
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    Re: AW: Re: Lots of .dmp files. Why? Value?

    Joerg:
    But the daily maintenance task should not be an unexpected termination, isn't it?

    That's what I would have thought but many of the zero byte .dmp files are time stamped at this time.

    Joerg:
    We never used the daily maintenance because I have to restart our Windows Server anyhow at least once a month during MS update day. The other times Mercury is normally running incident-free. Nevertheless just searched for any dmp files but didn't find any.

    I've turned off the restart associated with the daily maintenance task to see what happens.

    Interestingly, there is now a zero byte .dmp file time stamped at the time I shutdown Mercury late yesterday afternoon for backup purposes.  That certainly should have been a graceful shutdown.

  •  01-17-2019, 15:40

    • Rolf Lindby is not online. Last active: 2019-04-19, 14:58 Rolf Lindby
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    Re: Lots of .dmp files. Why? Value?

    Depending on why the program terminates it may not be possible to create a memory dump, so the file can sometimes be empty.

    I haven't used daily restarts myself, but perhaps if the restart breaks an ongoing transaction in one of the protocol modules it could trigger a memory dump.

  •  01-18-2019, 14:24

    • Brian Fluet is not online. Last active: 04-18-2019, 18:16 Brian Fluet
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    Re: Lots of .dmp files. Why? Value?

    I attempted to read one of the .dmp files but need a symbol file (.pdb).  Is it available?  Please let me know if it is unlikely that I would know what I was looking at even I had the symbol file (I'm a user, not a coder).
  •  01-18-2019, 16:27

    • Brian Fluet is not online. Last active: 04-18-2019, 18:16 Brian Fluet
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    Re: Lots of .dmp files. Why? Value?

    An associate of mine helped to expose this .dmp file content (similar content it multiple .dmp files):

    Exception code 0xC0000005

    The thread tried to read from or write to a virtual address for which it does not have the appropriate access.

    Unhandled exception at 0x001A03BB (mercury.exe) in 181024-100247.dmp (interesting that this is the source .dmp file).

    Access violation reading location 0x062DBCF0.

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