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https://issues.apache.org/jira/browse/CASSANDRA-6746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ryan McGuire updated CASSANDRA-6746:
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Attachment: 6746.buffered_io_tweaks.write-flush-compact-mixed.png
write, flush, compact, mixed read/write:
!6746.buffered_io_tweaks.write-flush-compact-mixed.png!
[data
here|http://riptano.github.io/cassandra_performance/graph/graph.html?stats=stats.6746.buffered-io-tweaks.write-flush-compact-mixed.json&metric=op_rate&operation=mixed&smoothing=1&xmin=0&xmax=381.59&ymin=0&ymax=98910.9]
So, looks like it's eliminating any drop at the start. I don't have an
explanation for the short/periodic drops here in mixed mode. I don't have a lot
of experience with this new stress mode yet to know, except that 2.0 without
JNA still faired better.
> 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.buffered_io_tweaks.logs.tar.gz,
> 6746.buffered_io_tweaks.write-flush-compact-mixed.png,
> 6746.buffered_io_tweaks.write-read-flush-compact.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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