Re: [Qemu-devel] QEMU travis builds: can we move the preseed tarball to qemu.org ?

[Daniel P. Berrange]

On Tue, Apr 25, 2017 at 04:24:18PM +0100, Alex Bennée wrote:
> 
> Daniel P. Berrange <address@hidden> writes:
> 
> > On Tue, Apr 25, 2017 at 03:51:17PM +0100, Peter Maydell wrote:
> >> Hi; a recent travis build failure made me notice that our .travis.yml
> >> config references a preseed tarball from here:
> >> http://people.linaro.org/~alex.bennee/qemu-submodule-git-seed.tar.xz
> >>
> >> I think this is a bit less than ideal -- we should really be hosting
> >> this on qemu.org. Can we arrange to move it?
> >
> > I'm curious how much speed difference there is in seeding the git submodules
> > in this way vs letting git pull down from git.qemu.org directly ?
> 
> It was quite high from what I recall, exacerbated by the fact we have
> quite so many submodules. Unfortunately it doesn't seem that easy to go
> back in the history of the tests to find out so I'll have to re-run the
> test:
> 
>   https://travis-ci.org/stsquad/qemu/builds/225648653
> 
> So roughly 62s without a seed vs 15s with. I presume the seed is also
> cached by Travis's web-caching.

Wow, yes, that is quite a difference !

I wonder if Travis' arbitrary sub-dir caching feature would help us to
the same extent, while avoiding need to manually maintain the preseed.

  https://docs.travis-ci.com/user/caching/

It just caches entire content of a given subdir between runs. First time
it would be slow, but presumably fast thereafter, and any time the submodule
gets new updates, those would get cached too

Regards,
Daniel
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