[Cython] Speedup hudson job with ccache

[Stefan Behnel]

Vitja Makarov, 07.07.2011 08:54:
> 2011/7/7 Stefan Behnel
>
>> Vitja Makarov, 07.07.2011 08:32:
>>
>>> 2011/7/7 Stefan Behnel
>>>
>>>   Robert Bradshaw, 06.07.2011 21:32:
>>>>
>>>>   We should get ccache on sage.math to start using it on hudson.
>>>>
>>>>>
>>>>>
>>>> It's just a single binary when installed. I have a copy in my
>>>> ~/ccache/bin.
>>>> Changing the Jenkins jobs now.
>>>>
>>>>
>>>>   Is that already used?
>>>
>>
>> Actually, no. I noticed that it would a) require changes to all test jobs,
>> and b) prevent us from getting clean test runs. I prefer a safe and clean
>> run over a fast one.
>>
>>
> a) you can set CYTHON_RUNTESTS_CCACHE globaly somewhere inside ~/.profile

;) I actually set it globally in Jenkins. However, that doesn't 
automatically remove the "rm -fr *" in the job configs - I initially 
thought that would be a problem, but, apparently, it isn't.


>> Also, the test runner clears the target directory on startup. I wonder
>> where you got your numbers from...
>>
> By default ccache stores object files inside ~/.ccache directory

Hmm, I guess changing that directory into a job local directory would still 
require changing each job... Are there any concurrency issues with ccache?

Anyway, I can't see a .ccache in my home directory, but if that's how it 
works, it should at least be properly enabled now.

Stefan