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From Jonathan Williamson <>
Subject Re: Why are reads from CouchDB so slow? (1.5MB/s or thereabouts)
Date Fri, 23 Mar 2012 13:23:12 GMT

Thanks for the input, that all sounds likely! It's not a massive
problem for us to store a raw copy of our data alongside our Couch

I do however think this falls slightly under "unexpected behaviour" as
intuitively I think a lot of people would expect raw read speeds to be
pretty fast and not require such heavy CPU usage. That said it's easy
to work around just a bit of a surprise to come across.

Love CouchDB for all the things it does for us so well - it's a great product!


On Fri, Mar 23, 2012 at 1:17 PM, Volker Mische <> wrote:
> I agree that using a trusted benchmarking tool is the way to go. Tough
> what Jonathan sees is pretty clear. It's the JSON -> Eterm -> String
> conversion that CouchDB is currently doing. Filipe proposed a patch that
> store the raw JSON on disk, to get rid most of this conversion. I don't
> remember exactly, but I'm pretty sure he provided sensible benchmarking
> results back then.
> Hence the point of this thread shouldn't be: go, do it properly. But: we
> have a clue why it is so slow, we don't store raw JSON, but Eterms on
> disk, that need to be assembled to a string everytime you request it.
> Cheers,
>  Volker

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