Re: Cygwin can't handle huge packfiles?

On Wed, Apr 05, 2006 at 04:14:20PM +0200, Johannes Schindelin wrote:

quoted

Inspired by a patch of Alex Riesen (thanks, Alex), I tried to use the
regular mmap for mapping pack files, only to discover that I compile
without defining "NO_MMAP", so I've been using the stock mmap all
along. So now I'm thinking that the cygwin mmap also does a
malloc-and-read, just like git does with NO_MMAP. So I'll continue to
investigate in that direction.

I think cygwin's mmap() is based on the Win32 API equivalent, which could 
mean that it *is* memory mapped, but in a special area (which is smaller 
than 1.5 gigabyte). In this case, it would make sense to limit the pack 
size, thereby having several packs, and mmap() them as they are needed.

Yes, cygwin's mmap uses CreateFileMapping and MapViewOfFile.  IIRC,
Windows might have a 2G limitation lurking under the hood somewhere but
I think that might be tweakable with some registry setting.

cgf