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From "Oliver Jowett (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IVY-1318) Faster symlink creation (avoid a JVM fork per symlink)
Date Mon, 03 Oct 2011 02:36:33 GMT
Faster symlink creation (avoid a JVM fork per symlink)
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                 Key: IVY-1318
                 URL: https://issues.apache.org/jira/browse/IVY-1318
             Project: Ivy
          Issue Type: New Feature
          Components: Core
    Affects Versions: 2.2.0
            Reporter: Oliver Jowett
            Priority: Minor


We have a large project using Ivy with many large artifacts.
In theory we should benefit from symlink="true" (space savings and reduced I/O), but in practice
the overhead of forking the Ant JVM for each individual symlink means that a build using symlink="true"
actually runs a lot (30%+) slower, which is too much of a cost to justify using it.

To work around this I modified FileUtils to run a single long-lived shell process that reads
instructions from stdin and performs symlinks accordingly.
This makes symlink="true" no slower than symlink="false".

I will attach a patch against 2.2.0. Tested only in a Linux environment, but in theory it
should work on anything POSIX-y, and should fall back to file copy much as the existing code
does if anything goes wrong.

Any interest in getting this included in an official version?


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