[phenixbb] Memory and CPU usage

[Pavel Afonine]

> But the resolution_factor is inconsistent - for the FFT structure
> factors calculation (which is unavoidable), we are definitely using
> 1/3 (I assume for speed reasons).  For most of the other optional
> tasks like rotamer correction and filling missing F-obs, it's 1/4.

Yes, we use 1/3 for structure factors and gradients calculations, and 
1/4 in map calculation if the map is going to be used for things like 
water picking, real-space refinement, etc. This is intentional.

Pavel