psutil.cpu_count(logical=False) returns None on arm

[fake-name]

Basically, psutil.cpu_count() returns the correct number of cores (4, on a raspberry pi 3), but psutil.cpu_count(logical=False) returns nothing at all.

[giampaolo]

That is by design, meaning (also the doc states it) that if physical CPUs cannot be determined the function will return None, similarly to os.cpu_count() and multiprocessing.cpu_count().
With that said, please paste the output of cat /proc/cpuinfo. I assume on raspberry it's either empty or has a different format (in which case we may adjust the parsing logic and fix this issue).

[fake-name]

Huh, I thought I didn't actually open this issue, because I wound up discovering that it intentionally returns None. As a result, I actually fixed it upstream in the package that uses cpuinfo (I'm doing stupid stuff with a pi, see gprMax/gprMax#111 ).

Anyways, sorry for the issue clutter, and I'll get you the contents of /proc/cpuinfo on monday, when I'm at work again.

[giampaolo]

It's OK. =)

[fake-name]

Ok, the Pi's /proc/cpuinfo

130 pi@testpi:~$ cat /proc/cpuinfo
processor       : 0
model name      : ARMv7 Processor rev 4 (v7l)
BogoMIPS        : 38.40
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 1
model name      : ARMv7 Processor rev 4 (v7l)
BogoMIPS        : 38.40
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 2
model name      : ARMv7 Processor rev 4 (v7l)
BogoMIPS        : 38.40
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 3
model name      : ARMv7 Processor rev 4 (v7l)
BogoMIPS        : 38.40
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

Hardware        : BCM2835
Revision        : a22042
Serial          : 00000000f4e64924

[giampaolo]

Yeah, the format is just different. It's better not to try to guess it and just return None.