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From "bd2019us (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OAK-8233) new Date.getTime() can be changed to System.currentTimeMillis() to improve performance
Date Fri, 12 Apr 2019 19:27:00 GMT

     [ https://issues.apache.org/jira/browse/OAK-8233?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

bd2019us updated OAK-8233:
--------------------------
    Description: 
Hello,
I found that System.currentTimeMillis() can be used here instead of new Date.getTime().
Since new Date() is a thin wrapper of light method System.currentTimeMillis().  The performance
will be greatly damaged if it is invoked too much times.
According to my local testing at the same environment, System.currentTimeMillis() can achieve
a speedup to 5 times (435 ms vs 2073 ms), when these two methods are invoked 5,000,000 times.


  was:
Location: oak-commons/src/main/java/org/apache/jackrabbit/oak/commons/LongUtils.java:52

Hello,
I found that System.currentTimeMillis() can be used here instead of new Date.getTime().
Since new Date() is a thin wrapper of light method System.currentTimeMillis().  The performance
will be greatly damaged if it is invoked too much times.
According to my local testing at the same environment, System.currentTimeMillis() can achieve
a speedup to 5 times (435 ms vs 2073 ms), when these two methods are invoked 5,000,000 times.



> new Date.getTime() can be changed to System.currentTimeMillis() to improve performance
> --------------------------------------------------------------------------------------
>
>                 Key: OAK-8233
>                 URL: https://issues.apache.org/jira/browse/OAK-8233
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>            Reporter: bd2019us
>            Priority: Major
>         Attachments: 1.patch
>
>
> Hello,
> I found that System.currentTimeMillis() can be used here instead of new Date.getTime().
> Since new Date() is a thin wrapper of light method System.currentTimeMillis().  The performance
will be greatly damaged if it is invoked too much times.
> According to my local testing at the same environment, System.currentTimeMillis() can
achieve a speedup to 5 times (435 ms vs 2073 ms), when these two methods are invoked 5,000,000
times.



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