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Posted to commits@cassandra.apache.org by "Benedict (JIRA)" <ji...@apache.org> on 2019/07/16 09:38:00 UTC

[jira] [Updated] (CASSANDRA-15215) VIntCoding should read and write more efficiently

     [ https://issues.apache.org/jira/browse/CASSANDRA-15215?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benedict updated CASSANDRA-15215:
---------------------------------
    Fix Version/s: 3.0.x

> VIntCoding should read and write more efficiently
> -------------------------------------------------
>
>                 Key: CASSANDRA-15215
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15215
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local/Compaction, Local/SSTable
>            Reporter: Benedict
>            Priority: Normal
>             Fix For: 3.0.x
>
>
> Most vints occupy significantly fewer than 8 bytes, and most buffers have >= 8 bytes spare, in which case we can construct the relevant bytes in a register and memcpy them to the correct position.  Since we read and write a lot of vints, this waste is probably measurable, particularly during compaction and flush, and can probably be considered a performance bug.



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