To address your original question in case you didn’t get an answer in private, Barry, see infra what I get on a Macmini9,1. I can send you an update when I get my hands on the newer MBP if you don’t have new batch of results by then. Thanks, Pierre /Users/jolivet/petsc/arch-darwin-c-opt/bin/mpicc -o MPIVersion.o -c -Wall -Wwrite-strings -Wno-strict-aliasing -Wno-unknown-pragmas -fstack-protector -fno-stack-check -Qunused-arguments -fvisibility=hidden -Ofast -I/Users/jolivet/petsc/include -I/Users/jolivet/petsc/arch-darwin-c-opt/include `pwd`/MPIVersion.c Running streams with '/Users/jolivet/petsc/arch-darwin-c-opt/bin/mpiexec ' using 'NPMAX=8' 1 58465.2862 Rate (MB/s) 2 57883.6350 Rate (MB/s) 0.990051 3 57538.6275 Rate (MB/s) 0.98415 4 57343.4226 Rate (MB/s) 0.980811 5 53210.3840 Rate (MB/s) 0.910119 6 50956.9355 Rate (MB/s) 0.871576 7 51621.7521 Rate (MB/s) 0.882947 8 48377.2931 Rate (MB/s) 0.827453 ------------------------------------------------ Traceback (most recent call last): File "process.py", line 89, in <module> process(sys.argv[1],len(sys.argv)-2) File "process.py", line 33, in process speedups[i] = triads[i]/triads[0] TypeError: 'dict_values' object is not subscriptable make[2]: [mpistream] Error 1 (ignored) Traceback (most recent call last): File "process.py", line 89, in <module> process(sys.argv[1],len(sys.argv)-2) File "process.py", line 33, in process speedups[i] = triads[i]/triads[0] TypeError: 'dict_values' object is not subscriptable make[2]: [mpistreams] Error 1 (ignored)

On 25 Oct 2021, at 10:52 PM, Jed Brown <[email protected]> wrote:

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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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