[Numpy-discussion] PEP 574 - zero-copy pickling with out of band data

[Andrew Nelson]

<snip>

On Tue, 3 Jul 2018 at 09:31, Charles R Harris <charlesr.harris at gmail.com>
wrote:

>
> ISTR that some parallel processing applications sent pickled arrays around
> to different processes, I don't know if that is still the case, but if so,
> no copy might be a big gain for them.
>

That is very much correct. One example is using MCMC, which is massively
parallel. I do parallelisation with mpi4py, and this requires distribution
of pickled data of a reasonable size to the entire MPI world. This pickling
introduces quite a bit of overhead.
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