[Twisted-web] Ampoule vs PerspectiveBroker

[Jacek Furmankiewicz]

OK, I will look at Ampoule and deferToAMPProcess while looking into the
CorePost multicore support.

Thanks Glyph,
Jacek

On Thu, Oct 13, 2011 at 1:01 PM, Glyph <glyph at twistedmatrix.com> wrote:

>
> On Oct 13, 2011, at 11:41 AM, Jacek Furmankiewicz wrote:
>
> > Which is the recommended way for interprocess communication these days?
> >
> > Is it the existing PerspectiveBroker or Ampoule (which uses AMP as the
> underlying RPC protocol)?
> > Are there drawbacks/benefits to either of them?
>
> Somebody should probably write an AMP vs. PB wiki page or something, this
> does come up every so often.
>
> Briefly: PB's strength is that it allows you to serialize and synchronize
> large, complex object graphs with relatively little effort, but more safely
> and explicitly than (for example) Pickle would allow you to do.  Doing this
> with AMP would require specifying a large protocol with lots of object IDs,
> and you'd have to manage their mappings yourself.
>
> AMP's strength is that it's simple and visualizing the wire format is easy.
>  Most importantly you can visualize the wire format by looking at static
> declarations of commands and their responses, without ever examining any
> code.  This allows you to easily provide AMP interfaces between multiple
> languages (for example, C#: <http://amp-protocol.net/AmpSharp>).  This
> also means that AMP is a bit more performant (on current trunk, on CPython,
> ~2300 AMP/sec as opposed to ~1300 PB/sec).
>
> A bit more effort has been going into AMP lately because many core Twisted
> developers now believe that AMP covers more and more common use-cases, and
> that should generally be the default choice for most new protocol work.
>
> Bottom line: you should try AMP first, and if you find it's too tedious,
> maybe give PB a shot and see if it simplifies your protocol code.
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