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From "Oliver Jowett (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IVY-1318) Faster symlink creation (avoid a JVM fork per symlink)
Date Mon, 03 Oct 2011 02:38:33 GMT

     [ https://issues.apache.org/jira/browse/IVY-1318?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Oliver Jowett updated IVY-1318:
-------------------------------

    Attachment: ivy-2.2.0-symlink.txt

Attached ivy-2.2.0-symlink.txt, a unified diff against Ivy 2.2.0.
                
> Faster symlink creation (avoid a JVM fork per symlink)
> ------------------------------------------------------
>
>                 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
>         Attachments: ivy-2.2.0-symlink.txt
>
>
> 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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