[erlang-questions] Ref counted binary in ETS

Frank Muller <>
Thu Oct 27 23:24:19 CEST 2016


Tony,

Wow, 48-bytes is a huge overhead as N ~= 1000, and Every reader reads a
binary 10x times or so per second.

Can anyone please suggest a better strategy to efficiently share them with
a lesser overhead?

Frank.

Le Thursday, October 27, 2016, Tony Rogvall <> a écrit :

> 1. A reference.
>
> It will however build a 6-word structure called ProcBin on the heap for
> every binary reference that you read.
> On a 64 bit machine that will lead to a 48 byte overhead. Nearly 10%.
>
> /Tony
>
> > On 27 okt 2016, at 20:47, Frank Muller <
> <javascript:;>> wrote:
> >
> > Hi guys
> >
> > Suppose an ETS table with only 1 writer and N readers
> > This table contains only large binaries (>64B) with the same size 512B
> exactly.
> >
> > The single writer update these Bins once a while.
> > The N readers regularly read one of these Bins, but never change/update
> them.
> >
> > Questions: what a reader gets when reading a Bin from this ETS table:
> >
> > 1. a reference to that Bin
> > 2. or a full copy of that Bin
> >
> > Hope someone can clarify this (with an example).
> >
> > Thank you
> > Frank
> >
> > _______________________________________________
> > erlang-questions mailing list
> >  <javascript:;>
> > http://erlang.org/mailman/listinfo/erlang-questions
>
>
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