[Haskell-cafe] Need some advice around lazy IO

[C K Kashyap]

I got some profiling done and got this pdf generated. I see unhealthy
growths in my XML parser.



On Fri, Mar 22, 2013 at 8:12 PM, C K Kashyap <ckkashyap at gmail.com> wrote:

> Hi folks,
>
> I've run into more issues with my report generation tool .... I'd really
> appreciate some help.
>
> I've created a repro project on github to demonstrate the problem.
> git://github.com/ckkashyap/haskell-perf-repro.git
>
> There is a template xml file that needs to be replicated several times
> (3000 or so) under the data directory and then "driver" needs to be run.
> The memory used by driver keeps growing until it runs out of memory.
>
> Also, I'd appreciate some tips on how to go about debugging this
> situation. I am on the windows platform.
>
>
> Regards,
> Kashyap
>
>
> On Tue, Mar 19, 2013 at 1:11 PM, Kim-Ee Yeoh <ky3 at atamo.com> wrote:
>
>> On Tue, Mar 19, 2013 at 2:01 PM, Konstantin Litvinenko
>> <to.darkangel at gmail.com> wrote:
>> > Yes. You (and Dan) are totally right. 'Let' just bind expression, not
>> > evaluating it. Dan's evaluate trick force rnf to run before hClose. As I
>> > said - it's tricky part especially for newbie like me :)
>>
>> To place this in perspective, one only needs to descend one or two
>> more layers before the semantics starts confusing even experts.
>>
>> Whereas the difference between seq and evaluate shouldn't be too hard
>> to grasp, that between evaluate and (return $!) is considerably more
>> subtle, as Edward Yang notified us 10 days ago. See the thread titled
>> To seq or not to seq.
>>
>> -- Kim-Ee
>>
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>
>
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