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From "Ryan McGuire (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-6746) Reads have a slow ramp up in speed
Date Mon, 24 Mar 2014 00:03:48 GMT


Ryan McGuire commented on CASSANDRA-6746:

I ran a mixed read / write workload on a number of branches.

[You can see the results here|http://localhost:8000/graph.html?stats=stats.6746.buffered-io-tweaks.mixed.json]

That chart is a bit messy, so you need to click the colored squares to only see results for
a few branches at a time. 

The branches tested:
 * [~xedin]'s buffered-io-tweaks patch on cassandra-2.1 HEAD
 * cassandra-2.1 HEAD
 * cassandra-2.0 HEAD with JNA
 * cassandra-2.1 HEAD without JNA

Similar to the buffered-io-tweaks run I did for solo-reads, it looks to improve things here
as well. However, even in mixed workloads, simply disabling JNA is still working better. I
cannot currently test cassandra-2.1 without JNA because of CASSANDRA-6575 which I have just
now reopened.

> Reads have a slow ramp up in speed
> ----------------------------------
>                 Key: CASSANDRA-6746
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Ryan McGuire
>            Assignee: Benedict
>              Labels: performance
>             Fix For: 2.1 beta2
>         Attachments: 2.1_vs_2.0_read.png, 6746-buffered-io-tweaks.png, 6746-patched.png,
6746.blockdev_setra.full.png, 6746.blockdev_setra.zoomed.png, 6746.buffered_io_tweaks.logs.tar.gz,
6746.txt, buffered-io-tweaks.patch, cassandra-2.0-bdplab-trial-fincore.tar.bz2, cassandra-2.1-bdplab-trial-fincore.tar.bz2
> On a physical four node cluister I am doing a big write and then a big read. The read
takes a long time to ramp up to respectable speeds.
> !2.1_vs_2.0_read.png!
> [See data here|]

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