GHC's performance

[Johan Tibell]

On Fri, Apr 18, 2014 at 8:12 AM, Michał J Gajda <mjgajda at gmail.com> wrote:

> Dear Friends,
>
> I have a few weeks free just now, and a keen interest in GHC performance,
> so please count me in as a person interested in developing the solution :-).
>
> On Thu, Apr 10, 2014 at 5:57 PM, Johan Tibell <johan.tibell at gmail.com>wrote:
>
>> There are a few "projects" in this area I think we should undertake:
>>
>> ## Set up a performance dashboard
>>
>> Example: http://goperfd.appspot.com/ (try clicking the "Perf" and
>> "Graphs" buttons.)
>>
>> I think the way to go here is:
>>
>>  * Figure out how to build GHC and run the nofib suite in a repeatable
>> (i.e. scripted) manner.
>>
>
> Wouldn't it be faster to take GHC builds from the current builder?
> I understand that running GHC build for each commit may take some time...
> Where would be put the infrastructure?
> I could help to set it up, but I do not possess enough CPU power to hold
> it for a long time.
>

Don't worry too much about how you build GHC. Any way that works is fine.
The important part is that it's simple and works. If it can be written as a
simple shell script + some tools to post-process the output, it would be
easy to run on Jenkins.

Also, don't worry about finding a machine that can run the benchmarks
concurrently. If you get a dashboard and continuous build that works on
your development machine, we can find a real server for it (e.g. I have an
unused http://www.hetzner.de/en/hosting/produkte_rootserver/ex40)

So here's what I'd suggest:

1. Write a script that builds and runs the benchmarks on your local machine.
2. Write something that massages the output into a format that can be
pushed to whatever database the perf dashboard would user.
3. Get a dashboard up and running.
4. Tell us about the results. We'll find machines to run it on.

Feel free to ask questions if you get stuck anywhere.

-- Johan
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