If the numbers you reported are the average, that's interesting. Were you using an EBS volume or an ephemeral volume?
You can definitely be seeing a noisy neighbor effect, although typically you'll see inconsistent results. --- Jeremiah Peschka - Founder, Brent Ozar PLF, LLC Microsoft SQL Server MVP On Aug 12, 2011, at 8:37 AM, Maria Neise wrote: > I ran it on one day (on a sunday) but each workload 4 or 5 times and > my hard drive had 150GB. > So it could be Amazons fault? :) > > Cheers, > Maria > > On 12 August 2011 16:50, Jeremiah Peschka <jeremiah.pesc...@gmail.com> wrote: >> One question that pops into my mind is are these numbers averages over 3 or >> 5 runs or is this a single run? >> >> In my experience with EC2, I've run into I/O inconsistencies when I'm using >> anything less than 1TB drives and a large instance. There's a lot of >> potential for a noisy neighbor to steal I/O or CPU, or memory on the host OS >> which will put pressure on all other guests. >> --- >> Jeremiah Peschka - Founder, Brent Ozar PLF, LLC >> Microsoft SQL Server MVP >> >> On Aug 12, 2011, at 2:23 AM, Maria Neise wrote: >> >>> Hey, >>> I am doing some benchmarks with Riak and set up a cluster with 6 >>> server using Amazon EC2. On each server I have GB of data. I am using >>> Bitcask as backend and the Java-API for my client. I have some >>> workloads with different proportion of operations, for example insert, >>> read and update. I started a workload with 95% read and 5% update and >>> achieved a throughput of 1207 operations/second. When I tried out >>> another workload with 100% read I only got 228 ops/sec. But I thought >>> Riak would be faster with reads than with updates. I would appreciate >>> if you could give me a hint, why Riak achieves a higher throughput >>> when doing updates and inserts mixed with reads. >>> Thank you in advance. >>> Cheers, >>> Maria >>> >>> _______________________________________________ >>> riak-users mailing list >>> riak-users@lists.basho.com >>> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com >> >> _______________________________________________ riak-users mailing list riak-users@lists.basho.com http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
