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A comment on Scaleway launches RISC-V servers. Parent comment

Re:Scaleway launches RISC-V servers by drmpeg on Sunday March 03, 2024 @04:02PM (#39584519)
On the RISC-V IRC channel, it was shown that there was some bug with the Milk-V Pioneer processor, which is a C920 core. I'm not sure if the C910 has the same issue. The super slow benchmark was:

stress-ng --verbose --metrics --aggressive --atomic 64 --timeout 600

If you try this, adjust the number (64) to match the number of cores on your system.

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Re:Scaleway launches RISC-V servers by my123 on Sunday March 03, 2024 @04:59PM (#39584931)
It's not just about a given microbenchmark - that platform just sucks tbh. Hopefully something better appears.
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Re:Scaleway launches RISC-V servers by MuffinFlavored on Sunday March 03, 2024 @07:45PM (#39585930)
Can you expand on why it sucks?
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Re:Scaleway launches RISC-V servers by drmpeg on Sunday March 03, 2024 @05:37PM (#39585199)
Real world performance reported: glibc build on Unmatched ~7:30, on Pioneer ~16:20 hours.
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Re:Scaleway launches RISC-V servers by brucehoult on Sunday March 03, 2024 @08:22PM (#39586145)
I don't have a Pioneer (I wish!) but I just yesterday compiled GCC head (14.0.1) on my 16GB LicheePi 4A (same cores as the Pioneer, but only 4 instead of 64) and it took just under 7:03 in your notation:

    real    422m41.367s
    user    1430m56.638s
    sys     70m17.994s
It's hard to believe the Pioneer with 16x as many cores and a slightly higher clock speed and 128GB RAM and NVMe SSD vs eMMC would be slower.

My expectation is that it would beat my i9-13900HX laptop (24 cores) running riscv64/ubuntu in docker (QEMU) which took 1:42.

    real    101m44.472s
    user    1695m26.395s
    sys     24m36.671s
Note: newlib build, not glibc. But still!
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Re:Scaleway launches RISC-V servers by drmpeg on Sunday March 03, 2024 @09:09PM (#39586396)
The glibc times were reported on the RISC-V IRC channel by davidlt. Here's the backlog for that day.

https://libera.irclog.whitequark.org/riscv/2024-02-02

The stress-ng benchmark was suggested the previous day.

https://libera.irclog.whitequark.org/riscv/2024-02-01

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Re:Scaleway launches RISC-V servers by brucehoult on Sunday March 03, 2024 @09:17PM (#39586435)
Who knows what he did? There are opposite experiences cited in that same log:

    19:03 <xypron> Concerning Pioneerbox vs Unmatched: My experience with building Ubuntu'g glibc was 7 h on Pioneer box vs 3.5 days on Unmatched.
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