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utils: respect scheduler affinity in cpu_count()

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cpu_count() returns multiprocessing.cpu_count() but that is simply returns
os.cpu_count() so we could use that directly.

However this returns the number of CPUs on the host, not the number of
usable CPUs on the host. If the user is using scheduler affinity then
the number of usable CPUs may be less, so when determining how many cores
we can use check the affinity instead.

(From OE-Core rev: e2e8ccbe410b2f38bcd9525982b2261cf71aab60)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Ross Burton
2020-09-28 17:18:55 +01:00
committed by Richard Purdie
parent 87ebed58c7
commit c2a11e18c8
1 changed files with 1 additions and 2 deletions
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3
meta/lib/oe/utils.py
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@@ -249,8 +249,7 @@ def trim_version(version, num_parts=2):
return trimmed
def cpu_count(at_least=1):
import multiprocessing
cpus = multiprocessing.cpu_count()
cpus = len(os.sched_getaffinity(0))
return max(cpus, at_least)
def execute_pre_post_process(d, cmds):