For what it's worth, my 2 cents:
I recently had to upgrade my PC because I now edit regularly ~ 600MPix images
and the 8Go RAM of the previous box were not enough. So now I have 32Go of RAM
and I'm considering adding 32Go more. Roman's rule of thumb gives:
600MPix * 3*4*4 = 29GB and indeed I *always* use all the 32Go of RAM and
*always* swap (sometimes up to 32Go swap). So I confirm the 'lower estimate'
piece of advice given by Roman.
Cheers
denis
Date: Wed, 6 Jan 2016 15:18:45 +0300
From: Roman Lebedev <[email protected]>
Subject: Re: [Darktable-users] Benefit of more than 4 cores vs "speed"
To: Michael Below <[email protected]>
Cc: "[email protected]"
<[email protected]>
Message-ID:
<cadoyv_6jz-u7qdtbgwoxkb+yh0qffyu_gsudt7u6a8o0ew0...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
On Wed, Jan 6, 2016 at 3:08 PM, Michael Below <[email protected]> wrote:
> To calculate MPix from DPI use (length_in_inch*nr_dpi) * (width_in_inch *
> nr_dpi).
>
> So for 4? * 5? film at 3000 dpi you get (4 * 3000) * (5 * 3000) = 180 MPix
(yes, sounds about right)
> According to Roman?s rule of thumb, one image will need > 8 GB RAM.
I should probably note that those 8Gb must not be the the total amount of
RAM in the system, but the amount of free ram, fully available for darktable.
And do note that it is the lower estimate, in many cases darktable will need
*much* more. Though in many of those cases tiling will kick in and help.
> IMHO you don?t need to worry about CPU parallelism in that case, you should
> choose the slower CPU if you can avoid swapping that way.
>
>
>
> Cheers
>
> Michael
Roman.
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