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33 lines
1 KiB
Python
33 lines
1 KiB
Python
# Copyright 2023 Lary Gibaud
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# SPDX-License-Identifier: GPL-3.0-or-later
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import re
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from typing import Optional
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def arm_big_little_first_group_ncpus() -> Optional[int]:
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"""
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Infer from /proc/cpuinfo on aarch64 if this is a big/little architecture
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(if there is different processor models) and the number of cores in the
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first model group.
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https://en.wikipedia.org/wiki/ARM_big.LITTLE
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:returns: the number of cores of the first model in the order given by
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linux or None if not big/little architecture
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"""
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pattern = re.compile(r"^CPU part\s*: (\w+)$")
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counter = 0
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part = None
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with open("/proc/cpuinfo") as cpuinfo:
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for line in cpuinfo:
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match = pattern.match(line)
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if match:
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grp = match.group(1)
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if not part:
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part = grp
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counter += 1
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elif part == grp:
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counter += 1
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else:
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return counter
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return None
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