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On 11/26/2015 06:44 AM, Pavlo Shchelokovskyy wrote:
> Hi all,
> 
> I was long puzzled why devstack is installing numpy. Being a fantastic
> package itself, it has the drawback of taking about 4 minutes to compile
> its C extensions when installing on our gates (e.g. [0]). I finally took
> time to research and here is what I've found:
> 
> it is used only by websockify package (installed by AFAIK ironic and
> nova only), and there it is used to speed up the HyBi protocol. Although
> the code itself has a path to work without numpy installed [1], the
> setup.py of websockify declares numpy as a hard dependency [2].
> 
> My question is do we really need those speedups? Do we test any feature
> requiring fast HyBi support on gates? Not installing numpy would shave 4
> minutes off any gate job that is installing Nova or Ironic, which seems
> like a good deal to me.
> 
> If we decide to save this time, I have prepared a pull request for
> websockify that moves numpy requirement to "extras" [3]. As a
> consequence numpy will not be installed by default as dependency, but
> still possible to install with e.g. "pip install websockify[fastHyBi]",
> and package builders can also specify numpy as hard dependency for
> websockify package in package specs.

I went down this same path before. That masking is mandatory in the spec
- https://github.com/kanaka/websockify/pull/163

The right answer here is to get the wheel mirrors working in infra.

	-Sean

-- 
Sean Dague
http://dague.net