[HH] cores: AMD vs Intel

[Kurt Keville]

Ah, got you... also it is worth noting that in certain circumstances 
you can save the latency associated with a PCI bus transfer if you 
have your GPU on the same memory bus as your CPU as described below...
http://forums.arm.com/index.php?/topic/16594-mali-t604-opencl-shared-memory-size/
this is usually the largest source of latency in a hybrid application 
so it will be interesting to compare some portable OpenCL codes in 
this context (if we can find any!)... sorry for going a bit OT... :)

At 07:48 PM 3/13/2013, Shankar Viswanathan wrote:
>On Wed, Mar 13, 2013 at 2:58 PM, Kurt Keville <kkeville at mit.edu> wrote:
> > one thing I wasn't sure of in Anand's article... he said the ARM
> > Cortex-A15 was capable of addressing 16 GB but the A9 was only capable of
> > addressing 4GB... they are both ARMv7 so I don't think that is correct...
>
>The Cortex A15 is based on the ARMv7A architecture and introduced the
>Large Physical Address Extensions (LPAE):
>http://www.arm.com/products/processors/cortex-a/cortex-a15.php
>http://www.arm.com/files/pdf/at-exploring_the_design_of_the_cortex-a15.pdf
>
>Each process is still limited to a 32-bit virtual address space, but
>you can have a lot more physical address space to limit page swapping
>to disk in virtualized environments.
>
>Regarding Federico's original question, I agree that the choice
>completely comes down to the workload (my personal bias
>notwithstanding).
>
>-Shankar