Riak response time steadily increasing

Ricardo Mayerhofer ricardo.ekm at gmail.com
Thu Nov 19 11:23:42 EST 2015

It's seems the problem was the load itself. As any technology there's a
throughput limit you can achieve with a given hardware.

I was able to scale to m3.2xlarge and it handled a higher load.

Just wondered if there's a way to debug this kind of situation and if CPU
can really be Riak bottleneck (as it seems in my case). There's a way to
improve CPU usage?


On Wed, Nov 18, 2015 at 5:24 PM, Ricardo Mayerhofer <ricardo.ekm at gmail.com>

> Hi all,
> I'm doing some performance tests with Riak, I'm facing an issue where Riak
> response time increases from 3 ms average to 500 ms or even higher after
> some load.
> There's no disk contention, memory was fine. CPU was high even tough
> stable.
> I'm using multi backend being Bitcask the default one and the one used in
> this test. I've a separate disk for bitcask.
> SO was tuned (except by net.core.wmem_max, net.core.rmem_max,
> net.core.netdev_max_backlog which were not set at the time of the test)
> Merge was off (window set to another time), expiry grace time is set to 1
> hour.
> I'm using a five node cluster with m3.xlarge EC2 instance type.
> You can find attached the tests results and some related data.
> Any input, a way to increase the results or a way do drill down the cause
> is appreciated!
> Thanks!
> --
> Ricardo Mayerhofer

Ricardo Mayerhofer
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