On 2/12/2016 11:44 AM, Le_Forgeron wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Le 12/02/2016 16:46, dick balaska a écrit :
>>
>> [1] I have scenes where the i7 is only 20% faster than the i5. I
>> have other scenes where the i7 is 10x faster(!) than the i5. (I
>> don't know if that is a Windows (i7) vs. Linux (i5) issue.)
>
> My measures with i7 and povray (Linux): the HT-core is worth only 20
> to 25% percent of a real core. At least for benchmark scene.
>
> The compiler also play a significant role, and the intensive memory
> access of a scene might too (if you are lucking enough for your parsed
> scene to fit in the L3 cache of the CPU, big win): remember, despite
> the number of cores, there is only one bus to reach the RAM.
>
> http://wiki.povray.org/content/User:Le_Forgeron/vault/Compilation

Interesting.  20 years ago, the Intel compiler was the gold standard for 
Pov-Ray compiles.  I would have thought that gcc would have picked up 
whatever they were doing by now.

dik

Post a reply to this message