From: Linus Torvalds <torvalds@osdl.org>
To: Junio C Hamano <junkio@cox.net>
Cc: git@vger.kernel.org, "Shawn O. Pearce" <spearce@spearce.org>
Subject: Re: [PATCH 11/17] Fully activate the sliding window pack access.
Date: Sat, 23 Dec 2006 12:10:15 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0612231207400.3671@woody.osdl.org> (raw)
In-Reply-To: <7vodpuqtuf.fsf@assigned-by-dhcp.cox.net>
On Sat, 23 Dec 2006, Junio C Hamano wrote:
>
> I have been thinking that we should perhaps change Cygwin
> default to NO_MMAP. Safer but slower would be better than not
> working correctly for people on FAT32.
The thing is, with a smaller pack access window, it might not even be
slower. I don't know just _how_ many hoops cygwin jumps through for mmap,
and maybe mmap under cygwin is actually perfectly fine, but at the same
time I do suspect that UNIX mmap semantics are a lot harder to emulate
than just a regular "pread()", so it's quite possible that by avoiding
mmap you could avoid a lot of complex cygwin code.
And yes, making it all work on FAT32 would obviously be a good thing.
Only testing (or somebody who knows cygwin well) can tell.
Linus
next prev parent reply other threads:[~2006-12-23 20:10 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <53b67707929c7f051f6d384c5d96e653bfa8419c.1166857884.git.spearce@spearce.org>
2006-12-23 7:33 ` [PATCH 1/17] Replace unpack_entry_gently with unpack_entry Shawn O. Pearce
2006-12-23 7:33 ` [PATCH 2/17] Introduce new config option for mmap limit Shawn O. Pearce
2006-12-23 7:33 ` [PATCH 3/17] Refactor packed_git to prepare for sliding mmap windows Shawn O. Pearce
2006-12-23 7:33 ` [PATCH 4/17] Use off_t for index and pack file lengths Shawn O. Pearce
2006-12-23 7:33 ` [PATCH 5/17] Create read_or_die utility routine Shawn O. Pearce
2006-12-23 7:34 ` [PATCH 6/17] Refactor how we open pack files to prepare for multiple windows Shawn O. Pearce
2006-12-23 7:34 ` [PATCH 7/17] Replace use_packed_git with window cursors Shawn O. Pearce
2006-12-23 7:34 ` [PATCH 8/17] Loop over pack_windows when inflating/accessing data Shawn O. Pearce
2006-12-23 7:34 ` [PATCH 9/17] Document why header parsing won't exceed a window Shawn O. Pearce
2006-12-23 7:34 ` [PATCH 10/17] Unmap individual windows rather than entire files Shawn O. Pearce
2006-12-23 7:34 ` [PATCH 11/17] Fully activate the sliding window pack access Shawn O. Pearce
2006-12-23 18:44 ` Linus Torvalds
2006-12-23 19:34 ` Eric Blake
2006-12-24 0:58 ` Johannes Schindelin
2006-12-23 19:45 ` Junio C Hamano
2006-12-23 20:10 ` Linus Torvalds [this message]
2006-12-24 1:23 ` Johannes Schindelin
2006-12-24 2:23 ` Shawn Pearce
2006-12-24 2:35 ` Shawn Pearce
2006-12-23 7:34 ` [PATCH 12/17] Load core configuration in git-verify-pack Shawn O. Pearce
2006-12-23 7:34 ` [PATCH 13/17] Ensure core.packedGitWindowSize cannot be less than 2 pages Shawn O. Pearce
2006-12-23 7:34 ` [PATCH 14/17] Improve error message when packfile mmap fails Shawn O. Pearce
2006-12-23 7:34 ` [PATCH 15/17] Support unmapping windows on 'temporary' packfiles Shawn O. Pearce
2006-12-23 7:34 ` [PATCH 16/17] Create pack_report() as a debugging aid Shawn O. Pearce
2006-12-23 7:34 ` [PATCH 17/17] Test suite for sliding window mmap implementation Shawn O. Pearce
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