[Haskell-cafe] Web application interface

Michael Snoyman michael at snoyman.com
Thu Jan 14 06:34:57 EST 2010

On Thu, Jan 14, 2010 at 1:20 PM, Alberto G. Corona <agocorona at gmail.com>wrote:

> 2010/1/14 Michael Snoyman <michael at snoyman.com>
>> Well, for one thing, you'd need to use lazy IO to achieve your goal, which
>> has some safety issues. As things get more and more complex, the
>> requirements of lazy IO will continue to grow. This also has implications
>> for number of open file handles and deterministic space usage. Given the
>> fact that a lazy bytestring and easily be converted to an enumerator, I
>> think it makes sense to start a new package using this approach.
>> These must be issues of base library developers, not application
> developpers. TIme ago a guy said me that using an standard library like
> malloc for memory allocation where not the optimum. And he was right.
> Fortunately things went in the "non-optimum" direction.  You can make the
> application faster by using your own plumbing code instead of standard
> libraries provided that you have enough time and knowledge. Because I don´t
> have neither of the two  :-) (nor have the people that read my code and
> maintain the application), I really like the laziness of haskell and the
> lazy bytestring interface.
> Lazy bytestring interface is one thing; lazy IO is another. If you have
pure code generating a lazy bytestring, Hack will work fine for you. Try
this one however: take a 10MB YAML file, reformat it using something in the
IO monad (for example, look up values from a database) and produce HTML
output. Hack will *not* allow you to run in constant space without
significant usageof unsafe functions.

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