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:
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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
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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.
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