From: Victor Leschuk <vleschuk@gmail.com>
Date: Tue, 15 Dec 2015 15:31:39 +0000 (+0300)
Subject: grep: allow threading even on a single-core machine
X-Git-Tag: v2.8.0-rc0~125^2~2
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/b6b468b2bfaa8015568efad8e0a78b342e1ac640

grep: allow threading even on a single-core machine

Earlier we disabled threading when online_cpus() said "1", but on a
filesystem with long latency (or in a cold cache situation), using
multiple threads to drive I/O in parallel would improve performance
even on a single-core machines.

Signed-off-by: Victor Leschuk <vleschuk@accesssoftek.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

diff --git a/builtin/grep.c b/builtin/grep.c
index d04f4400d9..734d6ceaae 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -832,7 +832,7 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 	}
 
 #ifndef NO_PTHREADS
-	if (list.nr || cached || online_cpus() == 1)
+	if (list.nr || cached)
 		use_threads = 0;
 #else
 	use_threads = 0;