summaryrefslogtreecommitdiff
path: root/scripts/coccinelle
diff options
context:
space:
mode:
authorSumera Priyadarsini <sylphrenadin@gmail.com>2020-09-24 14:26:08 +0300
committerJulia Lawall <Julia.Lawall@lip6.fr>2020-09-27 23:52:59 +0300
commite16a7c47d56b4eeee82be662014c145bce2380e5 (patch)
tree077cc05ddd25817bfac84605d80de56f9a18adfa /scripts/coccinelle
parentb76f0ea013125358d1b4ca147a6f9b6883dd2493 (diff)
downloadlinux-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')
0 files changed, 0 insertions, 0 deletions