[Haskell-cafe] Space leak in WAI 3.0 application

[Gregory Collins]

On Tue, Nov 18, 2014 at 4:59 PM, Thomas Koster <tkoster at gmail.com> wrote:

> Why does version A not process the LBS in constant space?
>

The lazy bytestring is let-lifted out of the function so that subsequent
calls reuse the same heap value.


> What in version A is preventing the GC from collecting the LBS chunks
> after they have been fed to Warp?
>

The value is re-used (and the closure holds a reference) so the GC can't
collect it.

What is it about version B that permits the LBS chunks to be collected?
>

The allocation is performed underneath the lambda in version B and so you
get a fresh copy every time.

G
-- 
Gregory Collins <greg at gregorycollins.net>
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