[Seaside] Re: TableReport slow down

[Sven Van Caekenberghe]

> On 31 Dec 2015, at 15:02, Hilaire <hilaire at drgeo.eu> wrote:
> 
> Hello,
> 
> Some investigation shows an issue while appending an € symbol in the text representation of my money object (the one used by seaside for rendering)
> 
> CGMoney>>printOn: aStream
>     aStream << (amount asScaledDecimal: 2) greaseString << ' ' << '€'
> 
> Replacing '€' by 'EUR' gives back normal rendering time.
> 
> Indeed the '€' is encoded as WideString, so not sure what is happening. All content converted to WideString or what?

Yes, the string starts as a plain ByteString and once you add the € it gets automagically converted to a WideString, but you pay a huge price in performance: it involves the usage of global #become: each time, which is dead slow (Spur will help IIUC).

A possible solution is to somehow start with a WideString from the beginning (or force it before doing all elements one by one).

> But I really want to rendery euro symbol
> 
> Thanks
> 
> Hilaire
> 
> 
> Le 31/12/2015 14:32, Hilaire a écrit :
>> Hello,
>> 
>> I am experiencing a slow down rendering a large table report:
>> 
>> The table report is more than 240 lines. Reading at the source html, it
>> is about 900 bytes per lines, so a bit more than 200kB for the report.
>> Not much for the rest of the page. The page renders in a bit more 5s, on
>> a local loop.
>> Profiling shows most of time is spent in WideString>>at:put:
>> 
>> For me 200KB is not that big and this slow down does not look normal.
>> 
>> Seaisde is 3.1.3.2
>> Smalltalk is Pharo3
>> CPU is double core intel 800Mhz-2000Mhz
>> VM is 3.9-7   
>> 
>> The profiling tree is as shown in the screenshot.
>> 
>> Thanks
>> 
>> Hilaire
>> 
>> 
>> 
>> 
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>> 
>> seaside at lists.squeakfoundation.org
>> http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside
> 
> 
> -- 
> Dr. Geo
> 
> http://drgeo.eu
> http://google.com/+DrgeoEu
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