[infinispan-issues] [JBoss JIRA] Commented: (ISPN-276) Expensive to read a single byte in Lucene Directory

[Sanne Grinovero (JIRA)]

    [ https://jira.jboss.org/jira/browse/ISPN-276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12500289#action_12500289 ] 

Sanne Grinovero commented on ISPN-276:
--------------------------------------

Nice improvements!
Results by running a 5 minute benchmark:

Average slowdown compared to RAMDirectory - Infinispan Local cache - before patch:  114%
Average slowdown compared to RAMDirectory - Infinispan Local cache - after patch:  24%
Average slowdown compared to RAMDirectory - Infinispan Distributed cache - before patch:  123%
Average slowdown compared to RAMDirectory - Infinispan Distributed cache - after patch:  47%

Will do more tests on a long-running benchmark and profile, but I apply this now.

> Expensive to read a single byte in Lucene Directory
> ---------------------------------------------------
>
>                 Key: ISPN-276
>                 URL: https://jira.jboss.org/jira/browse/ISPN-276
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Lucene Directory
>    Affects Versions: 4.0.0.CR1, 4.0.0.CR2
>            Reporter: Sanne Grinovero
>            Assignee: Sanne Grinovero
>             Fix For: 4.0.0.GA
>
>         Attachments: lucene-core-2.9.2-SNAPSHOT.jar, readByte-1.1.diff, readByte.diff
>
>
> public byte readByte() in org.infinispan.lucene.InfinispanIndexIO is doing some expensive operations, while this is a very hot spot.
> Spotted by Earwin Burrfoot on Lucene's developer list.

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