Re: Cygwin can't handle huge packfiles?

On 4/3/06, Kees-Jan Dijkzeul [off-list ref] wrote:

I'm trying to get Git to manage a 5Gb source tree. Under linux, this
works like a charm. Under cygwin, however, I run in to difficulties.
For example:

$ git-clone sgp-wa/ sgp-wa.clone
fatal: packfile
./objects/pack/pack-56aa013a0234e198467ed37ae5db925764a6ee98.pack
cannot be mapped.
fatal: unexpected EOF
fetch-pack from '/cygdrive/e/Projects/sgp-wa/.git' failed.

To figure out what is happening, I printed the value of errno, which
turns out to be 12 (Cannot allocate memory). I'm not sure how mmap is

mmap in git on cygwin does not mmaps anything,
but just reads the whole file in memory.

I'm not sure how to approach this problem. Any tips would be greatly
appreciated.

I ended up hacking gitfakemmap like in the attached patches (sorry for mime).
It's very ugly and unsafe hack, and it's actually exactly the reason why it was
never submitted. Still, it helps me (it speedups revlist, for
instance), and maybe
it'll help you.
It is a really good example what stupid windows restrictions can do to
a program.

The patch is against git as of 3-Apr-2005, ~10 CET