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From CGS <cgsmcml...@gmail.com>
Subject Re: Why are reads from CouchDB so slow? (1.5MB/s or thereabouts)
Date Fri, 23 Mar 2012 11:21:59 GMT
...also, it would be nice to know how you inserted the documents and if
they have attachments (at that size, I suppose they have). Could you also
provide a result from ping 127.0.0.1 for response time fluctuations?

CGS




On Fri, Mar 23, 2012 at 12:16 PM, Jason Smith <jhs@iriscouch.com> wrote:

> Hi, Jonathan.
>
> Can we start by identifying how fast you think **is** reasonable. What
> speeds were you expecting? And on what grounds do you base that
> expectation?
>
> (For example, perhaps connecting and fetching one row from MySQL?)
>
> On Fri, Mar 23, 2012 at 11:06 AM, Jonathan Williamson <jon@netcopy.co.uk>
> wrote:
> > Hi everyone,
> >
> > I posted this question on Stack Overflow and Jason Smith suggested I
> > try this group instead.
> >
> >> I have a CouchDB (1.1.1) server running that contains a lot of
> documents in the 400-600KB size range.
> >>
> >> If I time fetching a full document from the database (not from a view,
> just the raw document) it takes 200-400ms to complete which equates to
> around 1.5MB/s throughput.
> >>
> >> If I write the same data to raw files on disk they load in 10-20ms
> (around 25-50 MB/s).
> >>
> >> I'd expect CouchDB to have some overhead, but an order of magnitude
> (and some) seems crazy for what is essentially a read!
> >>
> >> Can anyone shed some light onto why this might be the case?
> >>
> >> Update: As requested below, a timing from curl:
> >>
> >> # time curl http://localhost:5984/[dbname]/[documentname]
> >>
> >> real    0m0.684s
> >> user    0m0.004s
> >> sys     0m0.020s
> >>
> >> The fetched document was 642842 bytes. I've tested it on both a
> standard 1TB harddisk and an EC2 instance (EBS volume) with similar results.
> >
> > There was some discussion about the post which can be found here:
> >
> http://stackoverflow.com/questions/9807200/why-are-reads-from-couchdb-so-slow-1-5mb-s-or-thereabouts
> >
> > Thanks,
> >
> > Jon.
>
>
>
> --
> Iris Couch
>

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