[erlang-questions] Ref counted binary in ETS
Fri Oct 28 00:25:27 CEST 2016
Simple, you may your 512 byte memory chunks bigger :-)
> On 27 okt 2016, at 23:24, Frank Muller <frank.muller.erl@REDACTED> wrote:
> 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?
> Le Thursday, October 27, 2016, Tony Rogvall <tony@REDACTED> 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%.
> > On 27 okt 2016, at 20:47, Frank Muller <frank.muller.erl@REDACTED> 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
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