One-shot semantics in GHC event manager

[Austin Seipp]

Hey Andreas,

The basic rundown is that if we equip you with an account, you can
just do it yourself. Although we'd like to restrict access a bit more;
I'll figure something out.

Yeah, if you hop on IRC, we can chat quickly about it and work
something out in the mean time.


On Tue, Oct 14, 2014 at 10:57 AM, Andreas Voellmy
<andreas.voellmy at gmail.com> wrote:
> This is awesome. I'd like to try to recreate some of the evaluations for the
> multicore IO manager paper on that 40 core system at backspace. How can I
> get access to this? I'll jump on IRC - maybe it is easier to chat in
> realtime.
>
> On Mon, Oct 13, 2014 at 5:33 PM, Austin Seipp <austin at well-typed.com> wrote:
>>
>> For the record, I talked to Ben earlier on IRC, and I can provide him
>> with a machine to do intense benchmarks of the new I/O manager.
>>
>> Also, if any other developers (like Andreas, Johan, Bryan, etc) in
>> this space want a big machine to test it on, I can probably equip you
>> with one (or several). Since Rackspace is so gracious to us, we can
>> immediately allocate high-powered, physical (i.e. not Xen, but real
>> machines) machines to do high-scale testing on.[1]
>>
>> In any case, it's not hard to do and only takes a few minutes, so Ben:
>> let me know. (I've thought it would be neat to implement a leasing
>> system somehow, where a developer could lease a few machines for a
>> short period of time, at which point they expire and a background job
>> cleans them up.)
>>
>> [1] You can find the hardware specs here; GHC benchmarking is probably
>> best suited for the "OnMetal I/O" type, which has 40 cores, 2x PCIe
>> flash and 128GB of RAM -
>> http://www.rackspace.com/cloud/servers/onmetal/
>>
>> On Mon, Oct 13, 2014 at 2:05 PM, Ben Gamari <bgamari.foss at gmail.com>
>> wrote:
>> > Ben Gamari <bgamari.foss at gmail.com> writes:
>> >
>> >> Andreas Voellmy <andreas.voellmy at gmail.com> writes:
>> >>
>> >>> On Sat, Oct 11, 2014 at 12:17 PM, Ben Gamari <bgamari.foss at gmail.com>
>> >>> wrote:
>> >>>
>> >>> Ah... so this is not useful to you. I guess we could add `loop` to
>> >>> GHC.Event's export list. On the other hand, I like your LifeTime
>> >>> proposal
>> >>> better and then no one needs `loop`, so let's try this first.
>> >>>
>> >> I have a first cut of this here [1]. It compiles but would be I shocked
>> >> if it ran. All of the pieces are there but I need to change
>> >> EventLifetime to a more efficient encoding (there's no reason why it
>> >> needs to be more than an Int).
>> >>
>> > As it turns out the patch seems to get through the testsuite after a few
>> > minor fixes.
>> >
>> > What other tests can I subject this to? I'm afraid I don't have the
>> > access to any machine even close to the size of those that the original
>> > event manager was tested on so checking for performance regressions will
>> > be difficult.
>> >
>> > Cheers,
>> >
>> > - Ben
>> >
>> > _______________________________________________
>> > ghc-devs mailing list
>> > ghc-devs at haskell.org
>> > http://www.haskell.org/mailman/listinfo/ghc-devs
>> >
>>
>>
>>
>> --
>> Regards,
>>
>> Austin Seipp, Haskell Consultant
>> Well-Typed LLP, http://www.well-typed.com/
>
>



-- 
Regards,

Austin Seipp, Haskell Consultant
Well-Typed LLP, http://www.well-typed.com/