Hi Fons,sorry for the abbreviation PR == Pull Request. A request to merge your contribution into the VOLK repository in this case. This includes a forum to discuss the specifics and possible improvements before we merge your code.
Did your Boost issue get solved? Boost was only required for old VOLK and environment versions that did not support `std::filesystem` yet. Your kernel versions imply you use a more recent system that supports this C++17 feature. For everyone else, libvolk is still a C library. We only use C++ for tests etc.
For reference, these are the CPUs Intel Core i5-3470 https://www.intel.com/content/www/us/en/products/sku/68316/intel-core-i53470-processor-6m-cache-up-to-3-60-ghz/specifications.html With SSE and AVX Intel Core i5-4300U https://www.intel.com/content/www/us/en/products/sku/76308/intel-core-i54300u-processor-3m-cache-up-to-2-90-ghz/specifications.html With SSE, AVX, and AVX2I can't tell from a distance, why VOLK would not select AVX kernels on an AVX capable CPU.
For your benchmarking needs: https://github.com/google/benchmark This might be a very important section of the docs: https://github.com/google/benchmark/blob/main/docs/user_guide.md#preventing-optimization Especially `DoNotOptimize` should be interesting. It could very well happen, that your code was optimized out. Cheers Johannes On 14.10.23 11:02, Fons Adriaensen wrote:
Hi Johannes, Thanks for your response !first off, we'd need to know a bit more about your setup. Could you share the versions of VOLK and your host system, e.g. OS, version, etc. Furthermore, do you use a VM, a container, or smth like this?VOLK was 2.5.0, now upgraded to 3.0.0, same results. No VM, container, etc used. Machine info: zita1 (desktop) fons@zita1:~> lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Address sizes: 36 bits physical, 48 bits virtual Byte Order: Little Endian CPU(s): 4 On-line CPU(s) list: 0-3 Vendor ID: GenuineIntel Model name: Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz CPU family: 6 Model: 58 Thread(s) per core: 1 Core(s) per socket: 4 Socket(s): 1 Stepping: 9 CPU(s) scaling MHz: 45% CPU max MHz: 3600.0000 CPU min MHz: 1600.0000 BogoMIPS: 6387.26 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm cpuid_fault epb pti tpr_shadow flexp riority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts vnmi Virtualization features: Virtualization: VT-x Caches (sum of all): L1d: 128 KiB (4 instances) L1i: 128 KiB (4 instances) L2: 1 MiB (4 instances) L3: 6 MiB (1 instance) NUMA: NUMA node(s): 1 NUMA node0 CPU(s): 0-3 Vulnerabilities: Gather data sampling: Not affected Itlb multihit: KVM: Mitigation: VMX disabled L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT disabled Mds: Vulnerable: Clear CPU buffers attempted, no microcode; SMT disabled Meltdown: Mitigation; PTI Mmio stale data: Unknown: No mitigations Retbleed: Not affected Spec rstack overflow: Not affected Spec store bypass: Vulnerable Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization Spectre v2: Mitigation; Retpolines, STIBP disabled, RSB filling, PBRSB-eIBRS Not affected Srbds: Vulnerable: No microcode Tsx async abort: Not affected fons@zita1:~> uname -a Linux zita1 6.5.5-arch1-1 #1 SMP PREEMPT_DYNAMIC Sat, 23 Sep 2023 22:55:13 +0000 x86_64 GNU/Linux zita4 (laptop) 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): 4 On-line CPU(s) list: 0-3 Vendor ID: GenuineIntel Model name: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz CPU family: 6 Model: 69 Thread(s) per core: 2 Core(s) per socket: 2 Socket(s): 1 Stepping: 1 CPU(s) scaling MHz: 46% CPU max MHz: 2900.0000 CPU min MHz: 800.0000 BogoMIPS: 4990.47 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nons top_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand lahf_lm abm cpuid_fault epb invpcid_single pti tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm xsaveopt dtherm ida arat pln pts Virtualization features: Virtualization: VT-x Caches (sum of all): L1d: 64 KiB (2 instances) L1i: 64 KiB (2 instances) L2: 512 KiB (2 instances) L3: 3 MiB (1 instance) NUMA: NUMA node(s): 1 NUMA node0 CPU(s): 0-3 Vulnerabilities: Itlb multihit: KVM: Mitigation: VMX disabled L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable Mds: Vulnerable: Clear CPU buffers attempted, no microcode; SMT vulnerable Meltdown: Mitigation; PTI Mmio stale data: Unknown: No mitigations Retbleed: Not affected Spec store bypass: Vulnerable Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization Spectre v2: Mitigation; Retpolines, STIBP disabled, RSB filling, PBRSB-eIBRS Not affected Srbds: Vulnerable: No microcode Tsx async abort: Vulnerable: Clear CPU buffers attempted, no microcode; SMT vulnerable fons@zita4:~> uname -a Linux zita4 6.3.2-arch1-1 #1 SMP PREEMPT_DYNAMIC Thu, 11 May 2023 16:40:42 +0000 x86_64 GNU/Linux (needs an update !)Regarding your question, if these functions may be useful to VOLK / GNU Radio. I'd say yes. We'd have to figure out how this may work in practice though. I'd suggest to start with a PR.PR ? Ciao,
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