[Haskell-cafe] Optimizing performance problems with Aeson rendering large Text arrays

[Bas van Dijk]

On Feb 1, 2013 1:15 PM, "Oliver Charles" <ollie at ocharles.org.uk> wrote:
>
> Urgh, the formatting got totally destroyed in sending, I think. If so,
here's a paste of my email as I intended it to be sent:
>
> http://hpaste.org/81648
>
> Sorry about that!
> - Ocharles
>
>
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If I make a special case for text based UUIDs in aeson:

data Value = ... | UUID Text | ...

Data.Aeson.Encode.fromValue (UUID s) = singleton '"' <> fromText s <>
singleton '"'

Then encoding time improves by 20%.

So a big part of the time is spent encoding the UUID strings.

Bas
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