[Cython] Speedup hudson job with ccache

[Vitja Makarov]

2011/7/7 Stefan Behnel <stefan_ml at behnel.de>

> 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



> 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, how it
works:

1. It runs preprocessor (cpp), then adds compiler version, compilation flags
and so on.
2. Calculates checksum (md5? I don't know)
3. Check if it's already in the cache, no compilation is required

http://ccache.samba.org/

So I think that would be safe to use ccache here.

-- 
vitja.
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