From: Felix Moessbauer <felix.moessbauer@siemens.com>
To: bitbake-devel@lists.openembedded.org
Cc: quirin.gylstorff@siemens.com, adriaan.schmidt@siemens.com,
Felix Moessbauer <felix.moessbauer@siemens.com>
Subject: [PATCH 1/1] utils: better estimate number of available cpus
Date: Wed, 13 Mar 2024 11:06:45 +0100 [thread overview]
Message-ID: <20240313100645.588421-1-felix.moessbauer@siemens.com> (raw)
When running in a cgroup which is limited to a subset of cpus (via
cpuset.cpus), cpu_count() should return the number of cpus that can be
used instead of the number of cpus the system has.
This also aligns the semantics with nproc.
Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
---
For a more detailed explanation about the difference, please also see
https://github.com/python/cpython/issues/77167
Best regards,
Felix Moessbauer
Siemens AG
lib/bb/utils.py | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/lib/bb/utils.py b/lib/bb/utils.py
index ad13d043..ebee65d3 100644
--- a/lib/bb/utils.py
+++ b/lib/bb/utils.py
@@ -1142,7 +1142,10 @@ def get_referenced_vars(start_expr, d):
def cpu_count():
- return multiprocessing.cpu_count()
+ try:
+ return len(os.sched_getaffinity(0))
+ except OSError:
+ return multiprocessing.cpu_count()
def nonblockingfd(fd):
fcntl.fcntl(fd, fcntl.F_SETFL, fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK)
--
2.39.2
reply other threads:[~2024-03-13 10:07 UTC|newest]
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