Re: sharing DL_DIR?

[Christopher Larson <kergoth@gmail.com>]

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I share it as well. I don't see locks being a big issue for most things, as the worst case is a re-download, not use of a corrupt or incomplete file, due to the completion stamps.

-- 
Christopher Larson


On Wednesday, February 22, 2012 at 4:39 PM, Tom King wrote:

> I have a single downloads directory with symlinks for every target build I have to that directory.  As long as I have the source already in there I don't fetch  it again
> 
> Tom
> 
> On Wed, Feb 22, 2012 at 1:33 PM, Rich Pixley <rich.pixley@palm.com (mailto:rich.pixley@palm.com)> wrote:
> > Is it reasonable to expect to share DL_DIR between multiple builds?
> > 
> > That is, are downloads properly locked so that multiple concurrent downloads of the same file won't collide?  And if so, are they NFS safe locks?
> > 
> > Or must each build download it's own copies of every component?
> > 
> > I ask because our, (Palm), branch has been, but it's a bit of a nuisance to pick a suitable locking mechanism that is both functional and performant.
> > Flock/lockf aren't reliably supported in heterogeneous environments. 
> > The old lockfiles don't work over NFS. Lock directories apparently do, but trying to clean these up after interruptions or failures is a losing battle so if we do use these, we end up with orphan locks periodically.
> > With NFS as a possibility, we can't assume any kernel local IPC mechanism, so sysV ipc is out.
> > It seems like a pretty huge overhead to try to create any sort of zeroconf overhead.
> > 
> > Our solution so far has been to use NFS lock directories for multiple machine builds and flock/lockf for single machine builds.  This mostly works, though it's not ideal, and it's significantly faster than downloading/copying all of the component source multiple times even over local mirrors.
> > --rich
> > 
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