You have been subscribed to a public bug:
Update:
This is likely due to the WSL2 limit on the number of cores. I used a Ubuntu
22.04 usb boot drive to test and find the correct number of cores.
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My Laptop has Intel 12th Gen CPU 12800HX, which has 16 cores (8 p-cores and 8
e-cores), and 24 threads (2 per p-core and 1 per e-core)
https://www.intel.com/content/www/us/en/products/sku/226058/intel-core-i712800hx-processor-25m-cache-up-to-4-80-ghz/specifications.html
I am using (5.15.79.1-microsoft-standard-WSL2), it only sees 12 cores with 2
threads each. The host Windows 11 does recognize the CPU correctly.
lscpu returns the following:
------------------------------------------------
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 39 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 24
On-line CPU(s) list: 0-23
Vendor ID: GenuineIntel
Model name: 12th Gen Intel(R) Core(TM) i7-12800HX
CPU family: 6
Model: 151
Thread(s) per core: 2
Core(s) per socket: 12
Socket(s): 1
Stepping: 2
BogoMIPS: 4608.01
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush mmx fxsr sse ss e2 ss ht syscall
nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology tsc_reliable nonstop
_tsc cpuid pni pclmulqdq vmx ssse3 fma cx16 pcid sse4_1
sse4_2 x2apic movbe popcnt tsc_deadline _timer aes
xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single ssbd
ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi ept vpid
ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi 2 erms
invpcid rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves
avx_vnni u mip waitpkg gfni vaes vpclmulqdq rdpid
movdiri movdir64b fsrm serialize flush_l1d arch_capabili
ties
Virtualization features:
Virtualization: VT-x
Hypervisor vendor: Microsoft
Virtualization type: full
Caches (sum of all):
L1d: 576 KiB (12 instances)
L1i: 384 KiB (12
instances)
L2: 15 MiB (12 instances)
L3: 25 MiB (1
instance)
Vulnerabilities:
Itlb multihit: Not affected
L1tf: Not affected
Mds: Not affected
Meltdown: Not affected
Mmio stale data: Not affected
Retbleed: Mitigation;
Enhanced IBRS
Spec store bypass: Mitigation; Speculative Store Bypass disabled via
prctl and seccomp
Spectre v1: Mitigation; usercopy/swapgs barriers and __user
pointer sanitization Spectre v2:
Mitigation; Enhanced IBRS, IBPB conditional, RSB filling, PBRSB-eIBRS SW
sequence Srbds: Not affected
Tsx async
abort: Not affected
---------------------------------------------------
I found this when I was trying to use OpenMPI for some parallel data
processing. The OpenMPI can also see 12 cores only and complains if I
use `mpirun -np 16 myapp` because there is "not enough" cores.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Invalid
** Tags: bot-comment
--
Incorrect number of cores for 12th Gen Intel CPU
https://bugs.launchpad.net/bugs/2003985
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