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Date: Fri, 2 Aug 2013 00:29:48 +0000 (UTC)
From: "BELUGA BEHR (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Message-ID: <JIRA.12656998.1373420298993.155715.1375403388522@arcas>
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Subject: [jira] [Commented] (COMPRESS-234) Patch: TAR InputStream Huge Speed
 Improvements
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    [ https://issues.apache.org/jira/browse/COMPRESS-234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13727155#comment-13727155 ] 

BELUGA BEHR commented on COMPRESS-234:
--------------------------------------

Stefan,

Like I said, the test for reading just the file headers is amazingly different on my SSD HD.  Since this patch changes the class so much, submitting a separate ticket for the NPE seems futile.

Please keep me posted when this makes it in!
                
> 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: Archiver_Tar.2.patch, Archiver_Tar.3.patch, Archiver_Tar.patch, TarArchiveInputStream.java.final.patch, 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 a margin of error and the timings bounces around a lot.

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