Re: [PATCH 00/20] Read `packed-refs` using mmap()

Michael Haggerty [off-list ref] writes:

Following lots of work to extract the `packed_ref_store` into a
separate module and decouple it from the `files_ref_store`, it is now
possible to fundamentally change how the `packed-refs` file is read.

* `mmap()` the whole file rather than `read()`ing it.

* Instead of parsing the complete file at once into a `ref_cache`,
  parse the references out of the file contents on demand.

* Use a binary search to find, very quickly, the reference or group of
  references that needs to be read. Parse *only* those references out
  of the file contents, without creating in-memory data structures at
  all.

Oooh, juicy and very exciting.

...
This branch applies on top of mh/packed-ref-transactions. It can also
be obtained from my git fork [1] as branch `mmap-packed-refs`.

Michael

[1] https://github.com/mhagger/git

Thanks for working on this. I expect that it will take more than a
few hours for me to pick it up, but I am looking forward to it.