[phenixbb] Memory and CPU usage
Pavel Afonine
pafonine at lbl.gov
Sat Jul 21 09:43:49 PDT 2012
Hi Nat,
>> Assuming for the moment that you have 90x90x90
>> unit cell edges, you can calculate the approximate memory size of an
>> FFT'd map using this formula:
>>
>> map_size = 8 * a * b * c * (d_min/3)^3
I see (d_min/3) in your formula above as a grid step factor. Most of map
calculations in phenix.refine and tools around it use (d_min/4). Putting
this into your formula
map_size = 8 * a * b * c * (d_min/4)^3
will obviously result in a smaller map, which isn't true. Am I missing
something?
Pavel
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