GHC build time graphs

[Reid Barton]

On Tue, Feb 9, 2016 at 11:20 AM, Karel Gardas <karel.gardas at centrum.cz>
wrote:

> On 01/28/16 11:34 PM, Ben Gamari wrote:
>
>> Joachim Breitner <mail at joachim-breitner.de> writes:
>>
>> Hi Oleg,
>>>
>>> Am Freitag, den 29.01.2016, 00:22 +0200 schrieb Oleg Grenrus:
>>>
>>>> Is the same compiler used to build HEAD and 7.10,1?
>>>>
>>>
>>> Good call. In fact, no: 7.10.1 is built with 7.6.3, while HEAD is built
>>> with 7.10.3.
>>>
>>> Anthony’s link, i.e.
>>>
>>> https://perf.haskell.org/ghc/#compare/ca00def1d7093d6b5b2a937ddfc8a01c152038eb/a496f82d5684f3025a60877600e82f0b29736e85
>>> has links to the build logs of either build; there I could find that
>>> information.
>>>
>>> That might be (part) of the problem. But if it is, it is even worse, as
>>> it would mean not only building the compiler got slower, but the
>>> compiler itself...
>>>
>>> I can verify that the build itself is indeed slower. Validating the
>> current state of ghc-7.10 takes 19 minutes, whereas ghc-8.0 takes 25.5
>> minutes. This isn't entirely unexpected but the change is quite a bit
>> larger than I had thought. It would be nice to know which commits are
>> responsible.
>>
>
> btw, just recent experience on ARM64 (X-gene board):
>
> bootstrapping 7.10.1 with 7.6.x took: ~120 minutes
> bootstrapping 8.0.1 RC2 with 7.10.1 took: ~446 minutes
>
> both run as: ./configure; time make -j8
>

It would be interesting to have the time for bootstrapping 7.10.1 with
7.10.1 too, for comparison.

Regards,
Reid Barton
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