CreateFiber() : number of fibers limited

Christopher Faylor
Sun Jun 3 09:05:00 GMT 2001

On Sun, Jun 03, 2001 at 08:59:48AM -0700, Randall R Schulz wrote:
>Don't forget about the Cygwin-wide memory allocation limit dictated by the 
>DWORD registry entry "heap_chunk_in_mb" (HKEY_CURRENT_USER\Software\Cygnus 
>Solutions\Cygwin\heap_chunk_in_mb) which defaults to 128 (megabytes).
>Where this limit typically hit me was in compiling a C program with a large 
>switch statement using gcc with -O4 optimization.

That controls cygwin's allocation.  It should have nothing to do with
allocation of memory for the Windows API functions.


>At 03:16 2001-06-03, Holger Vogt wrote:
>>independently of the requested stack size (first parameter in
>>CreateFiber()), CYGWIN will give only 53 fibers. Only when I increase
>>the stack size above 9.5 MByte, I will get a further reduction in the
>>number of fibers created.
>>The error by GetLastError is always no. 8, 'Not enough storage is
>>available to process this command.'.
>>Borland C++Builder Compiler (same test application) will reduce the
>>number of possible fibers according to stack size. 1000 fibers are no
>>problem with a stack size of 64 k Byte.

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