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https://issues.apache.org/jira/browse/CASSANDRA-6746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13944549#comment-13944549
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Ryan McGuire edited comment on CASSANDRA-6746 at 3/23/14 7:37 PM:
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[~xedin] Here's a benchmark of your buffered-io-tweaks patch:
!6746-buffered-io-tweaks.png!
[data is
here|http://riptano.github.io/cassandra_performance/graph/graph.html?stats=stats.6746.buffered-io-tweaks.json&metric=op_rate&operation=read&smoothing=1&xmin=0&xmax=494.34&ymin=0&ymax=77357.5]
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.
was (Author: enigmacurry):
[~xedin] Here's a benchmark of your buffered-io-tweaks patch:
!6746-buffered-io-tweaks.png!
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: https://issues.apache.org/jira/browse/CASSANDRA-6746
> 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|http://ryanmcguire.info/ds/graph/graph.html?stats=stats.2.1_vs_2.0_vs_1.2.retry1.json&metric=interval_op_rate&operation=stress-read&smoothing=1]
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