From: Linus Torvalds Date: Tue, 19 Dec 2006 06:51:19 GMT Subject: Re: cloning the kernel - why long time in "Resolving 313037 deltas" Message-ID: In-Reply-To: <20061219063930.GA2511@spearce.org> On Tue, 19 Dec 2006, Shawn Pearce wrote: > > Why isn't git-index-pack doing the same? Is there some hidden glitch > in some OS somewhere that has a problem with overmapping a file and > appending into it via write()? I've done that on Mac OS X, Linux, > BSDi, Solaris... never had a problem. It works on modern systems, but at least old HPUX versions had non-coherent mmap() and write(), and POSIX does not guarantee it. And if you ever want to port to Windows, I don't think you should do it. Anyway, try the pread() version first, see if that fixes the OS X problem.