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From: Christopher Faylor <me@cgf.cx>
To: Johannes Schindelin <Johannes.Schindelin@gmx.de>,
	Kees-Jan Dijkzeul <k.j.dijkzeul@gmail.com>,
	git@vger.kernel.org
Subject: Re: Cygwin can't handle huge packfiles?
Date: Wed, 5 Apr 2006 17:08:44 -0400	[thread overview]
Message-ID: <20060405210844.GN26780@trixie.casa.cgf.cx> (raw)
In-Reply-To: <Pine.LNX.4.63.0604051612200.25304@wbgn013.biozentrum.uni-wuerzburg.de>

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

  reply	other threads:[~2006-04-05 21:09 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-04-03  9:46 Cygwin can't handle huge packfiles? Kees-Jan Dijkzeul
2006-04-03 13:23 ` Johannes Schindelin
2006-04-03 14:26   ` Morten Welinder
2006-04-03 14:33   ` Linus Torvalds
2006-04-03 14:36     ` Linus Torvalds
2006-04-05 13:24       ` Kees-Jan Dijkzeul
2006-04-05 14:14         ` Johannes Schindelin
2006-04-05 21:08           ` Christopher Faylor [this message]
2006-04-05 23:27             ` Rutger Nijlunsing
2006-04-06  0:34               ` Christopher Faylor
2006-04-06  4:13         ` Junio C Hamano
2006-04-07  8:15       ` Junio C Hamano
2006-04-07  8:27         ` Jakub Narebski
2006-04-07 14:11         ` Nicolas Pitre
2006-04-07 18:31           ` Junio C Hamano
2006-04-07 18:46             ` Nicolas Pitre
2006-04-03 15:12     ` Johannes Schindelin
2006-04-03 14:38 ` Alex Riesen
  -- strict thread matches above, loose matches on Subject: below --
2006-04-06 20:57 linux
2006-04-06 23:53 ` Junio C Hamano
2006-04-07  3:05   ` linux

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