Re: Scaling noise

[Martin J. Bligh]

> multi node yes, numa not much and where numa-like systems are being used
> they are being used for message passing not as a fake big pc. 
> 
> Numa is valuable because
> - It makes some things go faster without having to rewrite them
> - It lets you partition a large box into several effective small ones 
>   cutting maintenance
> - It lets you partition a large box into several effective small ones
>   so you can avoid buying two software licenses for expensive toys
> 
> if you actually care enough about performance to write the code to do
> the job then its value is rather questionable. There are exceptions as
> with anything else.

The real core use of NUMA is to run one really big app on one machine, 
where it's hard to split it across a cluster. You just can't build an 
SMP box big enough for some of these things.

M.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/