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From "BELUGA BEHR (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (COMPRESS-234) Patch: TAR InputStream Huge Speed Improvements
Date Fri, 12 Jul 2013 00:57:48 GMT

     [ https://issues.apache.org/jira/browse/COMPRESS-234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

BELUGA BEHR updated COMPRESS-234:
---------------------------------

    Attachment:     (was: TarBuffer.java.patch)
    
> Patch: TAR InputStream Huge Speed Improvements
> ----------------------------------------------
>
>                 Key: COMPRESS-234
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-234
>             Project: Commons Compress
>          Issue Type: Improvement
>          Components: Archivers
>            Reporter: BELUGA BEHR
>         Attachments: TarArchiveInputStream.java.patch, TarBuffer.java.patch
>
>
> I have looked over TarBuffer And TarArchiveInputStream and found some ways to improve
performance orders of magnitude.
> I used a 1 GB TAR archive file (no compression).
> Times for reading all entry file names:
> Current - 630ms
> Mine - 17ms
> Times for extracting all entry files:
> Current 2446ms
> Mine - 2214ms
> As you can see, I have enhanced the "skip" methods greatly.  Actual extraction was within
an margin of error as the times bounces around a lot.

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