4 ms·

Compile time vs x86 doesn't look so bad, considering the x86 machine has 4x the cores and is zen4 microarchitecture. This P550 seems like the first "fast" RISC

by snvzz 2y ago

Compile time vs x86 doesn't look so bad, considering the x86 machine has 4x the cores and is zen4 microarchitecture. This P550 seems like the first "fast" RISC-V CPU actually available.

brucehoult 2y ago
Cross-builds for GNU toolchain, LLVM, Linux Kernel are going to be much faster on a low end (similar price) x86. But most packages don't have as solid (or any) cross-build infrastructure as those projects. I did some benchmarks on RISC-V Linux kernel builds (commit 7503345ac5f5, defconfig) this week. Native on SBCs, cross-build on a couple of x86, docker (qemu-user) on x86. - 1m45s i9-13900HX cross-compile - 4m29s Milk-V Pioneer (youtube video from 9 months ago .. close enough) - 10m10s Ryzen 5 4500U (6 cores, Zen2) laptop cross-compile - 22m48s RISC-V docker on 24 core i9-13900HX laptop - 67m35s VisionFive 2 (4x U74) - 88m4s Lichee Pi 4A (4x C910) I need a figure for SpacemiT in BPI-F3 / Jupiter / LPi3A / DC-Roma II / MuseBook. I think it'll be more or less the same as the VF2. My guess is the Milk-V Megrez (EIC7700X @1.8 GHz) might come in around 25 minutes, and this HiFive Premier (same Soc @1.4 GHz) 30 minutes. So the P550 machines will probably be a little slower than qemu on the i9. Not a lot. But even the VF2 and LPi4A are going to be much faster than qemu on that 6 core Zen2 -- I haven't measured it, but I'm guessing around 130m. So if you already have that high core count x86, maybe you don't need a P550 machine. On the other hand it's good to verify on real hardware. On the gripping hand, with a 16 GB Megrez costing $199 and my i9 costing $1600, if you want a build farm with 5 or 10 or 100 machines then the P550 is looking pretty good. VF2 (or Mars) is still looking pretty good for price/performance. The problem there is that being limited to 8 GB RAM isn't good. That's not enough for example to do riscv-gnu-toolchain without swapping. That build is fine on my 16 GB LPi4A, but not my VF2. 16 GB or 32 GB on the P550 boards is much more robust.
- brucehoult 2y ago
  One more: - 70m57s Lichee Pi 3A (8x SpacemiT x60 @1.6 GHz) 5% slower than the VisionFive 2, despite the extra cores.

by snvzz 2y ago

Compile time vs x86 doesn't look so bad, considering the x86 machine has 4x the cores and is zen4 microarchitecture. This P550 seems like the first "fast" RISC-V CPU actually available.

brucehoult 2y ago

Cross-builds for GNU toolchain, LLVM, Linux Kernel are going to be much faster on a low end (similar price) x86. But most packages don't have as solid (or any) cross-build infrastructure as those projects. I did some benchmarks on RISC-V Linux kernel builds (commit 7503345ac5f5, defconfig) this week. Native on SBCs, cross-build on a couple of x86, docker (qemu-user) on x86. - 1m45s i9-13900HX cross-compile - 4m29s Milk-V Pioneer (youtube video from 9 months ago .. close enough) - 10m10s Ryzen 5 4500U (6 cores, Zen2) laptop cross-compile - 22m48s RISC-V docker on 24 core i9-13900HX laptop - 67m35s VisionFive 2 (4x U74) - 88m4s Lichee Pi 4A (4x C910) I need a figure for SpacemiT in BPI-F3 / Jupiter / LPi3A / DC-Roma II / MuseBook. I think it'll be more or less the same as the VF2. My guess is the Milk-V Megrez (EIC7700X @1.8 GHz) might come in around 25 minutes, and this HiFive Premier (same Soc @1.4 GHz) 30 minutes. So the P550 machines will probably be a little slower than qemu on the i9. Not a lot. But even the VF2 and LPi4A are going to be much faster than qemu on that 6 core Zen2 -- I haven't measured it, but I'm guessing around 130m. So if you already have that high core count x86, maybe you don't need a P550 machine. On the other hand it's good to verify on real hardware. On the gripping hand, with a 16 GB Megrez costing $199 and my i9 costing $1600, if you want a build farm with 5 or 10 or 100 machines then the P550 is looking pretty good. VF2 (or Mars) is still looking pretty good for price/performance. The problem there is that being limited to 8 GB RAM isn't good. That's not enough for example to do riscv-gnu-toolchain without swapping. That build is fine on my 16 GB LPi4A, but not my VF2. 16 GB or 32 GB on the P550 boards is much more robust.

brucehoult 2y ago
One more: - 70m57s Lichee Pi 3A (8x SpacemiT x60 @1.6 GHz) 5% slower than the VisionFive 2, despite the extra cores.