Re: Support for more than 256 CPU cores

1000 CPUs is insane. Scary stuff haha.

Jonathan Vasquez
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-------- Original Message --------
On May 5, 2023, 11:52, Hans Petter Selasky wrote:

> On 5/5/23 17:23, Tomek CEDRO wrote: > On Fri, May 5, 2023 at 3:38 PM Ed Maste wrote: >> FreeBSD supports up to 256 CPU cores in the default kernel configuration >> (on Tier-1 architectures). Systems with more than 256 cores are >> available now, and will become increasingly common over FreeBSD 14’s >> lifetime. (..) > > Congratulations! :-) > > I am looking after AMD Threadripper with 64 cores 2 threads each that > will give 128 CPU to the system.. maybe this year I could afford that > beast then I will report back after testing :-) > > In upcoming years variations of RISC-V will provide unheard before > number of CPU in a single SoC (i.e. 1000 CPU) at amazing power > efficiency and I saw reports of prototype with 3 x SoC of this kind on > a single board :-) > > https://spectrum.ieee.org/risc-v-ai > Hi, Maybe it makes sense to cluster CPU's in logical groups somehow. Some synchronization mechanism like EPOCH() are O(N²) where N is the number of CPUs. Not in the read-case, but in the synchronize case. It depends a bit though. Currently EPOCH() is executed every kern.hz . --HPS