[petsc-users] Configuring PETSc for KNL

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:

> On Wed, Apr 5, 2017 at 12:23 PM, Justin Chang <jychang48 at gmail.com> wrote:
>
>> I simply ran these KNL simulations in flat mode with the following options:
>>
>> srun -n 64 -c 4 --cpu_bind=cores numactl -p 1 ./ex48 ....
>>
>> Basically I told it that MCDRAM usage in NUMA domain 1 is preferred. I
>> followed the last example: http://www.nersc.gov/users/
>> computational-systems/cori/configuration/knl-processor-modes/
>>
>
> Right. I think, from the prior discussion, that -m 1 causes the run to fail
> if you spill out of MCDRAM. I think that is usually
> what we want since it makes things easier to interpret and running MKL from
> DRAM is like towing your McLaren with
> your Toyota.

I'm not sure whether getting the Intel acronyms mixed up (KNL vs MKL)
makes the quote above better or worse.
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