Throughput of read operations

Maria Neise maria.neise1 at
Fri Aug 12 11:37:02 EDT 2011

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? :)


On 12 August 2011 16:50, Jeremiah Peschka <jeremiah.peschka at> 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
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