[falsedan]

We're doing something similar, but using mesos. We bundle tests up, so we don't have to eat the setup costs for every test, and try tracking test pollution by splitting bundles when they fail & running them separately, again.

[not_yet_a_dalek]

That is more or less the same reason I started the eremetic framework. We were tired of dealing with the trouble of using a lot of VMs as jenkins-slaves, and long test suite runtimes.

https://github.com/klarna/eremetic

[dominotw]

where do you store build caches? npm/gems ect?

[falsedan]

Dependencies? On the host; they're ephemeral but they'll run multiple builds between coming into existence and disappearing.

[dominotw]

but first build always take a hit making the build times unpredictable making build time regressions hard to track.