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Posted to commits@cassandra.apache.org by "Alex Sorokoumov (Jira)" <ji...@apache.org> on 2022/11/11 19:01:00 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 ]
Alex Sorokoumov updated CASSANDRA-15215:
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Source Control Link: [35dbcc2c2dbe1c826fd6ecd6e8357f0f5a9bab02|https://github.com/apache/cassandra/commit/35dbcc2c2dbe1c826fd6ecd6e8357f0f5a9bab02], (was: [35dbcc2c2dbe1c826fd6ecd6e8357f0f5a9bab02|https://github.com/apache/cassandra/commit/35dbcc2c2dbe1c826fd6ecd6e8357f0f5a9bab02])
> 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 Elliott Smith
> Assignee: Alex Sorokoumov
> Priority: Normal
> Fix For: 4.1-alpha1, 4.1
>
> Attachments: testWriteRandomLongDOP_final.png, writeUnsignedVInt_megamorphic_BB.png, writeUnsignedVInt_megamorphic_DOP.png
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> 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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