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[Bug-tar] O_DIRECT support?


From: Aaron Daubman
Subject: [Bug-tar] O_DIRECT support?
Date: Wed, 4 Dec 2013 10:57:30 -0500

Greetings,

Back in 2004 O_DIRECT support was requested, and the response was that it was already on the todo list:
http://lists.gnu.org/archive/html/bug-tar/2004-07/msg00017.html

I have run into cache pollution issues causing degraded performance when using tar to copy/un-tar files to an active server, as seems to not be terribly uncommon:
http://www.mysqlperformanceblog.com/2010/04/02/fadvise-may-be-not-what-you-expect/

I am wondering what happened to this request, as modern tar still does not seem to support a direct mode, or other options to prevent cache pollution when un-taring large archives.

Has anybody else found creative solutions for this situation?

Thanks,
      Aaron

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