New G2 HP Prime

[cyrille de brébisson]

Hello,

I was very surprised to see the speed difference between the G1 and G2.
CPU frequency of G2 is faster (about 30% from memory). And it has more cache and a better micro architecture... But nothing that warant a *2 or more extra speed (no super scalar for example).
It's RAM is better, yes, but in a tight loop benchmark, only the cache is used, so it does not mater...

Extra speed in the CAS, when it comes to floating points (invert a 100*100 floating matrix for example), or in the advanced grapher/3D grapher are easely explained by the presence of the FPU (which is used by these 3 items)...

But extra speed in Home is not as Home does not use floats.

My best guess is that the extra speed come from a better OS.
First G2 has way way less threads running around. Saving a lot of CPU time.
But more importantly, the OS did not come with malloc and I had to recreate the whole memory allocation system, and I think that my code is way better than the BestaOS one.
Since both PPL and CAS programs are HUGELY dependent on mallocs, this probably makes up for a lot of the speed up...

Cyrille