Re: [LAU] Bye Bye 32 bit

Paul Davis wrote:

> On Thu, Dec 28, 2017 at 2:11 PM, Jeremy Henty <onepoint@starurchin.org>
> wrote:
>
> > Will Godfrey wrote:
> >
> > > If I've understood that correctly you can also ensure that they are
> > > also on the same socket, which apparently improves memory access.
> >
> > I think this is what is meant by NUMA (Non-Uniform Memory access).
>
> ​AFAIK, NUMA is dead for everything except a few research systems.
>
> Parallel/multi-processor systems these days are all "symmetric" (all
> processors have symmetrical access to all memory).
>
> NUMA is really, really, really hard to get right. Why? Cache
> invalidation. Several companies, organizations, etc. have
> tried. Last time I looked (and it has been a while, but I was quite
> involved with this stuff in the mid 1990s), everybody failed.​

Until I read the Wikipedia NUMA page just now I didn't realise that
NUMA involved multiple processors having their own caches of the same
data. Thanks for bringing me up to speed.

Regards,

Jeremy Henty
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Received on Fri Dec 29 08:15:01 2017