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From "Stanilovsky Evgeny (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (IGNITE-9272) PureJavaCrc32 vs j.u.zip.CRC32 benchmark and probably replace.
Date Tue, 14 Aug 2018 18:41:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-9272?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stanilovsky Evgeny reassigned IGNITE-9272:
------------------------------------------

    Assignee: Stanilovsky Evgeny

> PureJavaCrc32 vs j.u.zip.CRC32 benchmark and probably replace.
> --------------------------------------------------------------
>
>                 Key: IGNITE-9272
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9272
>             Project: Ignite
>          Issue Type: Improvement
>          Components: general
>    Affects Versions: 2.6
>            Reporter: Stanilovsky Evgeny
>            Assignee: Stanilovsky Evgeny
>            Priority: Major
>         Attachments: BenchmarkCRC.java
>
>
> I see that Ignite has its own crc32 realization called: PureJavaCrc32 and from desc it
seems to be : _The current version is ~10x to 1.8x as fast as Sun's native java.util.zip.CRC32
in Java 1.6_ But my jmh tests show opposite results.
> + If it really so, looks like backward compatibility would be easy, all that need is
just to take lower part of long form zip.crc32 realization.
> jmh results:
> Benchmark                   Mode  Cnt        Score        Error  Units
> BenchmarkCRC.Crc32          avgt    5  1521060.716 ±  44083.424  ns/op
> BenchmarkCRC.pureJavaCrc32  avgt    5  4657756.671 ± 177243.254  ns/op
> JMH version: 1.21
> VM version: JDK 1.8.0_131, Java HotSpot(TM) 64-Bit Server VM, 25.131-b11
> VM invoker: /usr/lib/jvm/java-8-oracle/jre/bin/java
> op system : ubuntu 16.10



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