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scripts: coccicheck: Change default value for parallelism

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By default, coccicheck utilizes all available threads to implement
parallelisation. However, when all available threads are used,
a decrease in performance is noted. The elapsed time is  minimum
when at most one thread per core is used.

For example, on benchmarking the semantic patch kfree.cocci for
usb/serial using hyperfine, the outputs obtained for J=5 and J=2
are 1.32 and 1.90 times faster than those for J=10 and J=9
respectively for two separate runs. For the larger drivers/staging
directory, minimium elapsed time is obtained for J=3 which is 1.86
times faster than that for J=12. The optimal J value does not
exceed 6 in any of the test runs. The benchmarks are run on a machine
with 6 cores, with 2 threads per core, i.e, 12 hyperthreads in all.

To improve performance, modify coccicheck to use at most only
one thread per core by default.

Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com>
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
This commit is contained in:
Sumera Priyadarsini 2020-09-24 16:56:08 +05:30 committed by Julia Lawall
parent b76f0ea013
commit e16a7c47d5
1 changed files with 5 additions and 0 deletions
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scripts/coccicheck
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@ -75,8 +75,13 @@ else
OPTIONS="--dir $KBUILD_EXTMOD $COCCIINCLUDE"
fi
# Use only one thread per core by default if hyperthreading is enabled
THREADS_PER_CORE=$(lscpu | grep "Thread(s) per core: " | tr -cd [:digit:])
if [ -z "$J" ]; then
NPROC=$(getconf _NPROCESSORS_ONLN)
if [ $THREADS_PER_CORE -gt 1 -a $NPROC -gt 2 ] ; then
NPROC=$((NPROC/2))
fi
else
NPROC="$J"
fi