Beginners performance problem

Lars J. Nilsson lars.j.nilsson at cubeia.com
Fri Feb 22 10:40:24 EST 2013


Hi Sean,

Thanks for pipjng in. And how do I do that?

Cheers
/Lars J. Nilsson
Executive VP, Cubeia Ltd
+46 (0) 704 / 10 69 53


On 22 February 2013 16:28, Sean Cribbs <sean at basho.com> wrote:

> Given iostat says ~10% utilization, I would suggest increasing the
> concurrency of your writes. It's obviously not using up the capacity
> of the disk, your bottleneck is elsewhere. 2MB/sec is low for any
> commodity hardware.
>
> On Fri, Feb 22, 2013 at 9:21 AM, Lars J. Nilsson
> <lars.j.nilsson at cubeia.com> wrote:
> > Hi all,
> >
> > I'm micro-testing a simple update pattern (key + short json document) on
> my
> > local workstation (8 core intel CPU, 8 gig of RAM, 10K disk) to get
> baseline
> > before moving to cluster on AWS. With Riak I get about 60 mods/s before
> > maxing out (as compared to approx 3000 mods/s on a vanilla MySQL using
> > exactly the same code).
> >
> > It feels like I must be doing something hideously wrong. (For the record,
> > I'm a decent Java programmer but a riak/erlang n00b).
> >
> > Riak is installed via a vanilla Ununtu 12.04 package as described in the
> > docs. The test ran on the same disk as the mentioned MySQL test. The same
> > Java code was doing both tests (just a DAO swapped).
> >
> > The bucket was using n_val = 1.
> >
> > The problem seems to be in high disk-writing, despite the low load.
> Here's
> > what iostat says during the run:
> >
> > [...]
> > wrqm/s : 434.50
> > w/s: 182.90
> > wkB/s: 2618.00
> > avgrq-sz: 28.63
> > [...]
> > %util: 10.60
> >
> > Which seems to be too much considering the small load (the stored JSON
> blobs
> > are roughly 1K each).
> >
> > I'm using the official PB Java client.
> >
> > This is an evaluation for a customer. Any hint of what I'm missing or
> what
> > the problem could be would be appreciated.
> >
> > Cheers
> > /Lars J. Nilsson
> > Executive VP, Cubeia Ltd
> > +46 (0) 704 / 10 69 53
> >
> > _______________________________________________
> > riak-users mailing list
> > riak-users at lists.basho.com
> > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
> >
>
>
>
> --
> Sean Cribbs <sean at basho.com>
> Software Engineer
> Basho Technologies, Inc.
> http://basho.com/
>
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