[erlang-questions] Retrieving "semi-constant" data from a function versus Mnesia
Sun May 17 11:28:24 CEST 2015
On Mon, May 11, 2015 at 2:32 PM Joe Armstrong <> wrote:
> On Sun, May 10, 2015 at 10:32 PM, Benoit Chesneau <>
> > On Sun, May 10, 2015 at 10:23 PM Joe Armstrong <> wrote:
> >> How large is the total data?
> >> If it's small you could define this in a module and not use a database
> >> or process at all.
> > How small should it be? What if the compiled bean is about 888 kilobytes?
> It depends :-)
> There are many factors involved:
> a) How much memory do you have
> b) How often do you want to change the configuration data
> c) How quick do you the change to be
> a) is a smallish number of GBytes (normal these days)
> b) is "relatively rarely" (I don't know what this means - (aside - this
> is why
> I always ask people to provide numbers in their questions))
> Say once a day
> c) is a few seconds
> Then it should be perfectly doable. Making a module containing all the
> config data
> and recompiling when necessary is certainly the fastest way to access the
> data -
> this has very fast reads but very slow writes - you could think of a
> module as a database
> optimized for reads but not writes :-)
I see :) Thanks for the answer!
I'm already using such technic to speed access to unicode data in my IDNA
module  but always wondered if there is not a more efficient approach
since the compiled beam is quite big though less than 1MB. In term of speed
it's better that using ETS though I don't have the exact figures right now.
> > - benoit
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