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author | Sumera Priyadarsini <sylphrenadin@gmail.com> | 2020-09-24 14:26:08 +0300 |
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committer | Julia Lawall <Julia.Lawall@lip6.fr> | 2020-09-27 23:52:59 +0300 |
commit | e16a7c47d56b4eeee82be662014c145bce2380e5 (patch) | |
tree | 077cc05ddd25817bfac84605d80de56f9a18adfa /scripts/coccinelle | |
parent | b76f0ea013125358d1b4ca147a6f9b6883dd2493 (diff) | |
download | linux-e16a7c47d56b4eeee82be662014c145bce2380e5.tar.xz |
scripts: coccicheck: Change default value for parallelism
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>
Diffstat (limited to 'scripts/coccinelle')
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