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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