D2057: rust implementation of hg status

[Ivzhh (Sheng Mao)]

Ivzhh added a comment.


  Hi all,
  
  Based on the discussion a few weeks ago, I come up with a solution for review and discussion. After reading the Oxidation plan, the first thought is to bypass python engine and current plugin system IFF on request. If user (maybe background checker of IDE) request r-* subcommands, then hg gives rust implementations instead of python's. So I try to make hg r-status as fast as possible. The submitted version has comparable performance (as an example of the performance, not evidence, on my MacBook, in hg's own repo, hg r-status 150ms, and hg status 220ms). I am using CodeXL to profile the performance, and plan to use Future.rs to make the loading parallel and maybe 30ms faster.
  
  The implementation originates from hg python implementation, because the python version is really fast. I tried to split into small changes, however, I eventually to combine all hgstorage module as one commit.
  
  Thank you for your comments!

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D2057

To: Ivzhh, #hg-reviewers
Cc: krbullock, indygreg, durin42, kevincox, mercurial-devel