It look this might be already fixed upstream:
https://github.com/dlang/druntime/pull/2620
https://github.com/dlang/druntime/commit/0723a38a858aaaae83a9c5c0d43a0400571ef2a0
and could explain why ldc is showing correct values.
On Sat, 9 May 2020 at 22:57, Witold Baryluk <witold.bary...@gmail.com> wrote:
>
> Package: gdc-10
> Version: 10.1.0-1
> Severity: normal
>
> Dear Maintainer,
>
> ====
> import std.stdio;
> import core.cpuid;
> void main() {
> writefln("CPU: threads_per_cpu=%d; cores_per_cpu=%d; ht=%s; processor=%s",
> threadsPerCPU(), coresPerCPU(), hyperThreading(), processor());
> }
> ====
>
>
> # Using gdc-10 (10.1.0-1) and ligphobos1 (10.1.0-1)
> CPU: threads_per_cpu=1; cores_per_cpu=32; ht=false; processor=AMD Ryzen
> Threadripper 2950X 16-Core Processor
>
> # Using ldc (1:1.20.1-1) and libphobos2-ldc-shared-dev (= 1:1.20.1-1):
> CPU: threads_per_cpu=32; cores_per_cpu=16; ht=true; processor=AMD Ryzen
> Threadripper 2950X 16-Core Processor
>
>
> As can be seen gdc-10 (and gdc-9 too) returns wrong values.
>
> I tried various optimization options, different -mcpu, static phobos
> linking, etc. and they don't change it.
>
> I am running on a bare hardware (no kvm, Xen or qemu involved) with
> kernel Linux 5.2.17.
>
>
> For reference:
>
> $ lscpu
> Architecture: x86_64
> CPU op-mode(s): 32-bit, 64-bit
> Byte Order: Little Endian
> Address sizes: 43 bits physical, 48 bits virtual
> CPU(s): 32
> On-line CPU(s) list: 0-31
> Thread(s) per core: 2
> Core(s) per socket: 16
> Socket(s): 1
> NUMA node(s): 2
> Vendor ID: AuthenticAMD
> CPU family: 23
> Model: 8
> Model name: AMD Ryzen Threadripper 2950X 16-Core
> Processor
> Stepping: 2
> Frequency boost: enabled
> CPU MHz: 2431.075
> CPU max MHz: 3500.0000
> CPU min MHz: 2200.0000
> BogoMIPS: 6999.26
> Virtualization: AMD-V
> L1d cache: 512 KiB
> L1i cache: 1 MiB
> L2 cache: 8 MiB
> L3 cache: 32 MiB
> NUMA node0 CPU(s): 0-7,16-23
> NUMA node1 CPU(s): 8-15,24-31
> Vulnerability L1tf: Not affected
> Vulnerability Mds: Not affected
> Vulnerability Meltdown: Not affected
> Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass
> disabled via prctl and s
> eccomp
> Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and
> __user pointer sanit
> ization
> Vulnerability Spectre v2: Mitigation; Full AMD retpoline, IBPB
> conditional, STIBP disab
> led, RSB filling
> Flags: fpu vme de pse tsc msr pae mce cx8 apic sep
> mtrr pge mca cmov
> pat pse36 clflush mmx fxsr sse sse2 ht
> syscall nx mmxext fxs
> r_opt pdpe1gb rdtscp lm constant_tsc
> rep_good nopl nonstop_ts
> c cpuid extd_apicid amd_dcm aperfmperf pni
> pclmulqdq monitor
> ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt
> aes xsave avx f16c
> rdrand lahf_lm cmp_legacy svm extapic
> cr8_legacy abm sse4a mi
> salignsse 3dnowprefetch osvw skinit wdt tce
> topoext perfctr_c
> ore perfctr_nb bpext perfctr_llc mwaitx cpb
> hw_pstate sme ssb
> d sev ibpb vmmcall fsgsbase bmi1 avx2 smep
> bmi2 rdseed adx sm
> ap clflushopt sha_ni xsaveopt xsavec xgetbv1
> xsaves clzero ir
> perf xsaveerptr arat npt lbrv svm_lock
> nrip_save tsc_scale vm
> cb_clean flushbyasid decodeassists
> pausefilter pfthreshold av
> ic v_vmsave_vmload vgif overflow_recov
> succor smca
> $
>
> $ numactl -s
> policy: default
> preferred node: current
> physcpubind: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
> 25 26 27 28 29 30 31
> cpubind: 0 1
> nodebind: 0 1
> membind: 0 1
> $
>
> $ numactl --hardware
> available: 2 nodes (0-1)
> node 0 cpus: 0 1 2 3 4 5 6 7 16 17 18 19 20 21 22 23
> node 0 size: 64371 MB
> node 0 free: 15527 MB
> node 1 cpus: 8 9 10 11 12 13 14 15 24 25 26 27 28 29 30 31
> node 1 size: 64497 MB
> node 1 free: 678 MB
> node distances:
> node 0 1
> 0: 10 16
> 1: 16 10
> $
>
> $ nproc
> 32
> $
>
> $ getconf -a | grep PROCESSORS
> _NPROCESSORS_CONF 32
> _NPROCESSORS_ONLN 32
> $
>
> $ cpuid
> CPU 0:
> vendor_id = "AuthenticAMD"
> version information (1/eax):
> processor type = primary processor (0)
> family = 0xf (15)
> model = 0x8 (8)
> stepping id = 0x2 (2)
> extended family = 0x8 (8)
> extended model = 0x0 (0)
> (family synth) = 0x17 (23)
> (model synth) = 0x8 (8)
> (simple synth) = AMD Ryzen (Pinnacle Ridge PiR-B2) [Zen+], 12nm
> miscellaneous (1/ebx):
> process local APIC physical ID = 0x0 (0)
> cpu count = 0x20 (32) // <-----
> CLFLUSH line size = 0x8 (8)
> brand index = 0x0 (0)
> brand id = 0x00 (0): unknown
> feature information (1/edx):
> ...
> hyper-threading / multi-core supported = true // <-----
> ...
> feature information (1/ecx):
> ...
> ...
> $
>
> $ cpuid | grep ^CPU | wc -l
> 32
> $
>
> $ /proc/cpuinfo flags:
> flags : ..... sse2 ht .....
> $
>
>
> Regards,
> Witold
>
> -- System Information:
> Debian Release: bullseye/sid
> APT prefers unstable-debug
> APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1,
> 'experimental-debug'), (1, 'experimental')
> Architecture: amd64 (x86_64)
> Foreign Architectures: i386
>
> Kernel: Linux 5.2.0-3-amd64 (SMP w/32 CPU cores)
> Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE,
> TAINT_UNSIGNED_MODULE
> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
> LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /usr/bin/dash
> Init: systemd (via /run/systemd/system)
> LSM: AppArmor: enabled
>
> Versions of packages gdc-10 depends on:
> ii g++-10 10.1.0-1
> ii gcc-10-base 10.1.0-1
> ii libc6 2.30-7
> ii libgmp10 2:6.2.0+dfsg-4
> ii libgphobos-10-dev 10.1.0-1
> ii libisl22 0.22.1-1
> ii libmpc3 1.1.0-1
> ii libmpfr6 4.0.2-1
> ii libzstd1 1.4.4+dfsg-3
> ii zlib1g 1:1.2.11.dfsg-2
>
> gdc-10 recommends no packages.
>
> gdc-10 suggests no packages.
>
> -- no debconf information
