Hi,
>> Ideally, of course, WLCG jobs would remove the requirement that
>> multicore
>> jobs have all processes scheduled on a single node.
>
> In my view, as far as I can tell (which is not _that_ far because I'm
> an old slow guy) the usefulness of "multicore" is that the cache is
> filled by the first thread, and thus less loading and less ram is
> needed by the subsequent threads (because the cache is not loaded
> further.)
indeed multicore was introduced mostly to reduce memory requirements by
exploiting shared memory. This wouldn't be possible using MPI.
cheers
alessandra
> Hence, right now, multicore jobs must reside on one node. It's an
> unfortunate (or fortunate?) architectural hardware constraint (delete
> as appropriate).
> Cheers,
>
> Ste
--
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