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From: "Dill, Jens (END-CHI)" <jens DOT dill AT endinfosys DOT com>
To: cygwin AT cygwin DOT com
Subject: RE: cygheap base mismatch detected
Date: Thu, 16 Feb 2006 17:16:48 -0600
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More test results:

> I can run tests in which I allocate static arrays of increasingly
> large size, and I hit the cygheap base problem *exactly* when I
> try to make an array bigger than 1.5 Gb.

This still happens reliably, and note that I can declare an array
of *exactly* 1.5 Gb, and load and run the program.  I hit the
problem when I go over 1.5 Gb (my script increases the size
in 64-Mb increments).

> I can run tests in which I set the --heap option for the linker
> to increasingly large sizes, and I hit the cygheap base problem
> *exactly* when I try to make the heap size larger than 1.5 Gb.

Since I upgraded to the latest CygWin DLL, I get a pop-up window
that says ...

  The application failed to initialize properly (0xc0000005).
  Click on OK to terminate the application.

... instead of the "cygheap base mismatch" message.  

> I can run tests in which I set the --stack option for the linker
> to increasingly large sizes, and I get a "thread handle not set"
> error during execution the minute my stack size exceeds 0.5 Gb.
> Yes, that's 0.5.  I never go to the full 1.5 Gb.

This test doesn't seem to be helpful for the time being.

I have tinkered with the heap_chunk_in_mb setting in the registry,
trying 1024 Mb and 1536 Mb, without having any affect on the above
results (yes, I did reboot after each change).

My app includes a lot of DLLs.  I used cygcheck to get the list,
and summed up their sizes.  The total code size on disk before
loading of the app plus the DLLs is just over 115 Mb, leaving 
over 1420 Mb to be taken up by static and dynamic memory.
I still don't think the app uses more than a couple of Mb of
static memory, and the problem occurs before anything dynamic
can be allocated.  What am I overlooking?

                               -- Jens Dill
                                  Endeavor Information Systems

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