BRbrucehoult·Aug 20, 2023
TH1520 (Lichee Pi 4A, OoO cores similar to Arm A72) beats JH7110 (VisionFive 2 and others, in-order cores similar to Arm A55) on all micro-benchmarks.
e.g. by about 40% on my branchy primes benchmark, which exercises the CPU and L1 cache only: https://hoult.org/primes.txt
10.430 sec Sipeed LM4A TH1520 4x C910 @1.848 GHz 216 bytes 19.3 billion clocks
10.851 sec Sophon SG2042 64x C910 RV64 @1.8? GHz 216 bytes 19.3 billion clocks
12.115 sec Pi4 Cortex A72 @ 1.5 GHz A64 300 bytes 18.2 billion clocks
14.885 sec VisionFive 2 U74 _zba_zbb @ 1.5 GHz 214 bytes 22.3 billion clocks
19.500 sec Odroid C2 A53 @ 1.536 GHz A64 276 bytes 30.0 billion clocks
The TH1520 has much faster memcpy speeds at every level of cache and DRAM.
https://hoult.org/JH7110_memcpy.txt
https://hoult.org/JH7110_memcpy.txt
And yet .
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.. both Richard Jones at Fedora and I have found that the VisionFive 2 is actually slightly faster at building software packages!
My result was that building the same binutils + gcc + newlib snapshot (an old one with RVV 0.7.1 support)...
https://github.com/brucehoult/riscv-gnu-toolchain
... the VisionFive 2 takes 108 minutes while the Lichee Pi 4A takes 122 minutes.
That's with the supplied fan on the LPi4A (and confirmed it's not throttling) and no cooling at all on the VisionFive 2. I used the same Samsung external USB3 SSD on both -- the VisionFive 2 gets slightly faster transfer speeds (IIRC 190 MB/s vs 160) with that, but that's not enough to matter: just 12s difference on the time to tar up the source directory, compared to a 14 minute build time difference. Both have enough RAM to cache everything anyway.
> VF2 GPU: IMG BXE-4-32 Lichee Pi: ?? Anyone?
BXM-4-64