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https://issues.apache.org/jira/browse/KAFKA-545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13488884#comment-13488884
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Jay Kreps commented on KAFKA-545:
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Yes, for the above data everything is done on a FileChannel.
> Add a Performance Suite for the Log subsystem
> ---------------------------------------------
>
> Key: KAFKA-545
> URL: https://issues.apache.org/jira/browse/KAFKA-545
> Project: Kafka
> Issue Type: New Feature
> Affects Versions: 0.8
> Reporter: Jay Kreps
> Priority: Blocker
> Labels: features
> Attachments: KAFKA-545-draft.patch
>
>
> We have had several performance concerns or potential improvements for the
> logging subsystem. To conduct these in a data-driven way, it would be good to
> have a single-machine performance test that isolated the performance of the
> log.
> The performance optimizations we would like to evaluate include
> - Special casing appends in a follower which already have the correct offset
> to avoid decompression and recompression
> - Memory mapping either all or some of the segment files to improve the
> performance of small appends and lookups
> - Supporting multiple data directories and avoiding RAID
> Having a standalone tool is nice to isolate the component and makes profiling
> more intelligible.
> This test would drive load against Log/LogManager controlled by a set of
> command line options. These command line program could then be scripted up
> into a suite of tests that covered variations in message size, message set
> size, compression, number of partitions, etc.
> Here is a proposed usage for the tool:
> ./bin/kafka-log-perf-test.sh
> Option Description
> ------ -----------
> --partitions The number of partitions to write to
> --dir The directory in which to write the log
> --message-size The size of the messages
> --set-size The number of messages per write
> --compression Compression alg
> --messages The number of messages to write
> --readers The number of reader threads reading the data
> The tool would capture latency and throughput for the append() and read()
> operations.
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