[Virtualacorn-list] Speed of Iyonix??

[Roger Darlington]

On 7 Oct 2008, David J. Ruck wrote:
> Tim Powys-Lybbe <tim at powys.org> wrote:
>> With my 2.8Ghz 8-core thingy all I have managed to do are some simple
>> tests of loading a 75M sprite into various graphics programs on both
>> Iyonix (RAM = 512M) and Mac (RAM = 256M):
> 
> Is that RAM in the Mac, or RAM allocated to VRPC?

I think he said he had 6GB RAM in the MAC, so this 256MB RAM would all 
be allocated to VRPC IIUC (some small fraction of 6GB). [Tim cannot 
reply personally as he is away, and has asked me to explain].

> 
>> Doing the odd transformation on the loaded images then gave a similar
> 
> Doing something like a 90 degree rotation, or reduction of a large image to
> 50% size is a much more useful test than loading or saving.
> 
> As for having 8 cores, it isn't going to help very much. Even if VRPC can
> take advatange of multiple cores for doing background operations such as
> I/O, screen memory conversion and JIT lookaheads in other threads, RISC OS
> is a single threaded operating system, so it is always going to be tied to
> single threaded performance of the host system. Therefore targetting
> development effort at an fully optimising rather than block level JIT would
> make more sense.
> 
> Cheers
> ---Dave
> 


-- 

Cheers
Roger
Dark Energy first came to light in 1998