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From "Ryan McGuire (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-6746) Reads have a slow ramp up in speed
Date Sun, 23 Mar 2014 19:37:45 GMT


Ryan McGuire updated CASSANDRA-6746:

    Attachment: 6746-buffered-io-tweaks.png

[~xedin] Here's a benchmark of your buffered-io-tweaks patch:


It seemed to delay the ramp up, and shorten the duration, but it still did it. I did two trials
of it to make sure.

I'll get you a mixed workload benchmark soon. 

> 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.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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