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https://issues.apache.org/jira/browse/CASSANDRA-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C. Scott Andreas updated CASSANDRA-9747:
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Component/s: Core
> JNA makes Cassandra slower
> --------------------------
>
> Key: CASSANDRA-9747
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9747
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Cassandra 2.0.14; JNA 4.x; 32-core CPU; 64GB RAM (8GB
> heap); 2 physical HDDs used as commit and data; Java 1.7
> Reporter: Roman Bielik
> Priority: Minor
>
> When JNA is loaded (as recommended in the production settings), it has
> negative effect on performance, especially when used with HDD => it
> significantly increases the disk IO wait.
> It looks like JNA works fine only when used in combination with SSD disk.
> Otherwise it is better not to use JNA at all. This is very unexpected
> behavior, can you please analyse?
> Test description:
> Roughly 50% reads and 50% writes of about 1.5kB records using Thrift
> interface.
> Test results (sorted by performance):
> *HDD + JNA*
> Worst performance. High IO wait.
> *HDD, no JNA*
> Good performance. Low IO wait, but the Cassandra CPU usage is quite high.
> *SSD + JNA*
> Seems to provide the best performance. Low IO wait. Low Cassandra CPU usage.
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