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 <[email protected]> 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 > <[email protected]> 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 > > [email protected] > > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > > > > > > -- > Sean Cribbs <[email protected]> > Software Engineer > Basho Technologies, Inc. > http://basho.com/ >
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