On Sat, Feb 13, 2016 at 5:10 PM, Carlos E. R. <robin.listas@telefonica.net> wrote:
On 2016-02-13 22:59, David C. Rankin wrote:
On 02/13/2016 01:07 PM, Greg Freemyer wrote:
Here's a single chip CPU with 20 cores: http://wccftech.com/intel-broadwell-ep-xeon-e5-2698-v4-processor/
20 cores? That's nuts.
The last 2 CPUs I bought had 6-cores.
To run several VMs simultaneously you will want both a lot of ram and
Yes, what little reading I've done says RAM is king.
But another issue is that the original design has a singly data bus. To speed things up you need that the cpu chips can access their own memory pool simultaneously.
I suspect that a chip with so many cores doesn't have those many address and data buses, one per core.
Actually, I don't know how this is handled.
That's one reason multi-tier cache is so valuable. Each core has it's own dedicated cache as I understand it so there are a lot of memory accesses that never go out to the DIMMs. As to ram itself, DDR4 (or at least some implementations of DDR4) have quad memory channels so 4 different cores can be pulling data simultaneously. I don't know when this becomes really useful, but I suspect the 6-core PC I recently built isn't really taking advantage of all 4 quad channels. Greg -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org