From: Ben Peart <benpeart@microsoft.com>
Date: Mon, 29 Oct 2018 20:41:59 +0000 (-0400)
Subject: speed up refresh_index() by utilizing preload_index()
X-Git-Tag: v2.20.0-rc0~36^2~1
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/99ce720c338ebeb37331bd98f724569837c74d0d?hp=99ce720c338ebeb37331bd98f724569837c74d0d

speed up refresh_index() by utilizing preload_index()

Speed up refresh_index() by utilizing preload_index() to do most of the work
spread across multiple threads.  This works because most cache entries will
get marked CE_UPTODATE so that refresh_cache_ent() can bail out early when
called from within refresh_index().

On a Windows repo with ~200K files, this drops refresh times from 6.64
seconds to 2.87 seconds for a savings of 57%.

Signed-off-by: Ben Peart <benpeart@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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