linux-kernel - [PATCH v4 2/3] scripts: coccicheck: Change default condition for parallelism

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Message-ID: <13de95fe3959459ac9ae8c74d99eb7e3c5702a2d.1602410019.git.sylphrenadin@gmail.com>
Date:   Sun, 11 Oct 2020 15:59:42 +0530
From:   Sumera Priyadarsini <sylphrenadin@...il.com>
To:     Julia.Lawall@...6.fr
Cc:     corbet@....net, Gilles.Muller@...6.fr, nicolas.palix@...g.fr,
        michal.lkml@...kovi.net, cocci@...teme.lip6.fr,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: [PATCH v4 2/3] scripts: coccicheck: Change default condition for
 parallelism

Currently, Coccinelle uses at most one thread per core by default in
machines with more than 2 hyperthreads. However, for systems with only 4
hyperthreads, this does not improve performance.

Modify coccicheck to use all available threads in machines with
upto 4 hyperthreads.

Signed-off-by: Sumera Priyadarsini <sylphrenadin@...il.com>
---
 scripts/coccicheck | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/coccicheck b/scripts/coccicheck
index d67907b8a38b..209bb0427b43 100755
--- a/scripts/coccicheck
+++ b/scripts/coccicheck
@@ -79,7 +79,7 @@ else
     THREADS_PER_CORE=$(lscpu | grep "Thread(s) per core: " | tr -cd "[:digit:]")
     if [ -z "$J" ]; then
         NPROC=$(getconf _NPROCESSORS_ONLN)
-	if [ $THREADS_PER_CORE -gt 1 -a $NPROC -gt 2 ] ; then
+	if [ $THREADS_PER_CORE -gt 1 -a $NPROC -gt 4 ] ; then
 		NPROC=$((NPROC/2))
 	fi
     else
-- 
2.25.1