From: Sebastian Schuberth <sschuberth@gmail.com>
Date: Thu, 10 Oct 2013 20:19:13 GMT
Subject: Re: Windows performance / threading file access
Message-ID: <52570BC1.2040208@gmail.com>
In-Reply-To: <CAHOQ7J_ZZ=7j-5ULd7Tdvbiqg4inhwi+fue_w6WAtNRkvZSwsg@mail.gmail.com>

Please keep in mind to CC the msysgit mailing list for Windows-specific 
stuff. I'm also CC'ing Karsten who has worked on performance 
improvements for Git for Windows in the past.

Thanks for bringing this up!

-- 
Sebastian Schuberth


> Hi folks,
>
> I don't follow the mailing list carefully, so forgive me if this has
> been discussed before, but:
>
> I've noticed that when working with a very large repository using msys
> git, the initial checkout of a cloned repository is excruciatingly
> slow (80%+ of total clone time).  The root cause, I think, is that git
> does all the file access serially, and that's really slow on Windows.
>
> Has anyone considered threading file access to speed this up?  In
> particular, I've got my eye on this loop in unpack-trees.c:
>
> static struct checkout state;
> static int check_updates(struct unpack_trees_options *o)
> {
>          unsigned cnt = 0, total = 0;
>          struct progress *progress = NULL;
>          struct index_state *index = &o->result;
>          int i;
>          int errs = 0;
>
>          ...
>
>          for (i = 0; i < index->cache_nr; i++) {
>                  struct cache_entry *ce = index->cache[i];
>
>                  if (ce->ce_flags & CE_UPDATE) {
>                          display_progress(progress, ++cnt);
>                          ce->ce_flags &= ~CE_UPDATE;
>                          if (o->update && !o->dry_run) {
>                                  errs |= checkout_entry(ce, &state, NULL);
>                          }
>                  }
>          }
>          stop_progress(&progress);
>          if (o->update)
>                  git_attr_set_direction(GIT_ATTR_CHECKIN, NULL);
>          return errs != 0;
> }
>
>
> Any thoughts on adding threading around the call to checkout_entry?
>
>
> Thanks in advance,
>
> Stefan


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