RE: git commit results in many lstat()s

From: Gumbel, Matthew K <matthew.k.gumbel@intel.com>
Date: Feb 2, 2017, 00:14 UTC
Message-ID: <DA0A42D68346B1469147552440A645039A9C5929@ORSMSX115.amr.corp.intel.com>
In-Reply-To: <xmqq60ktmpwl.fsf@gitster.mtv.corp.google.com>

"Junio C Hamano <mailto:jch2355@gmail.com> writes:

"Gumbel, Matthew K" <matthew.k.gumbel@intel.com> writes:

>> Yes, I think that when the user passes --only flag to git-commit, then git does not
>> need to call refresh_cache() in prepare_index() in builtin/commit.c.
>>
>> I may experiment with that. Do you see any downside or negative side-effects?

> There may be other fallouts, but one that immediately comes to mind
> is that it may break pre-commit hook.

If pre-commit hook exists, we can fall-back to original behavior and call refresh_cache(). Many repos will not have pre-commit hook and can benefit from the speedup.

I'm testing such a change locally. Git test suite seems to be running for quite a while. Do you know any way to run it in parallel or otherwise speed it up?

Thanks, Matt