[petsc-dev] Anyone run STREAMS on an Apple M1 system?

[Jed Brown]

This shows 240 GB/s using 10 cores (8 performance + 2 efficiency) and 224 GB/s with 8 cores (as you'd most likely run HPC apps). Good, but far from the theoretical 400 GB/s headline.

https://www.anandtech.com/show/17024/apple-m1-max-performance-review/2

Barry Smith <bsmith at petsc.dev> writes:

>   Thanks, presumably we'll see the new Mac's there in a few days. BTW: the old streams benchmark page should point to this site; google is worthless.
>
>   I get 24 on my Intel MacBook Pro and it also saturates with 1 core.
>
>   Barry
>
>
>> On Oct 18, 2021, at 4:48 PM, Jed Brown <jed at jedbrown.org> wrote:
>> 
>> I don't have one, but this suggests it gets about 40 GB/s and can be saturated by a single core. I believe it uses two channels of LPDDR4X-4266, which has a theoretical peak of 68 GB/s.
>> 
>> https://browser.geekbench.com/v3/cpu/8931693
>> 
>> The press release claims up to 400 GB/s on the Max using DDR5. I assume that's calculated based on 8 channels of LPDDR5-6400, which seems like a surprisingly big step and I'm skeptical of what will actually be realized.
>> 
>> Barry Smith <bsmith at petsc.dev> writes:
>> 
>>>   Can anyone who owns an Apple M1 system run the MPI streams benchmark? Make sure the -O3 (or something) optimization flags are turned on.
>>> 
>>>  Thanks
>>> 
>>>    Barry