[petsc-users] Understanding matmult memory performance

[Lawrence Mitchell]

> On 29 Sep 2017, at 15:24, Lawrence Mitchell <lawrence.mitchell at imperial.ac.uk> wrote:
> 
>> according to
>> https://ark.intel.com/products/75283/Intel-Xeon-Processor-E5-2697-v2-30M-Cache-2_70-GHz
>> you get 59.7 GB/sec of peak memory bandwidth per CPU, so you should get about 240 GB/sec for your two-node system.
> 
> That's assuming I have DDR3-2133 RAM chips, but as noted above, it looks like the nodes probably have 1866 RAM.  Giving 204.8 GB/s.

Ugh, I can't multiply numbers together sensibly.  Karl is right, and I am dumb.

Lawrence
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