CreateFiber() : number of fibers limited

Randall R Schulz
Sun Jun 3 08:59:00 GMT 2001


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.

Randall Schulz
Mountain View, CA USA

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.
>Is it possible that there is a bug in libkernel32.a ?
>Holger Vogt

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