[Qt-interest] C++ + QT vs C#

[Pau Garcia i Quiles]

Hello,

How about combining C# and Qt by using the Qt C# bindings (Qyoto) ? :-)

http://techbase.kde.org/Development/Languages/Qyoto

A (very nice) application which uses Qyoto:
http://synapse.im/

2009/3/19 Scott Aron Bloom <Scott.Bloom at sabgroup.com>:
> Hope all you QT people like my numbers.. I’m pretty proud of them.
>
>
>
> So I’ve been working on a project for a client, and the previous consultant
> (who had to leave the project but Im friends with) is a C# guy… Loves C# etc
> etc…  Claims the performance is great and that Im full of $%#@ when I say
> Ill stick with C++ when and I need performance…  And even if I don’t.. Ill
> still take C++ J
>
>
>
> In taking over the project, essentially we had to be able to read in a tab
> separated file, with a random header, and insert it into a new table, using
> the first row as the field names of the database.
>
>
>
> He wrote it in C# and had all but the insert into DB working.. Now.. I
> didn’t like his style (he read the whole file in at once and then used a
> string splitter to split the lines…
>
>
>
> Initially its app sat at 450MB to read in the 118k rows due to having the
> whole thing in memory + each line in memory…
>
>
>
> Well we both wrote it to be read 1 line, process 1 line, maybe a bit slower…
> but not much..
>
>
>
>
>
>                 C++(Console) C++(GUI)                C#
>
> Memory before loading anything             6MB
> 9MB       22MB
>
> Memory after reading each line
>
> and inserting into DB
> 6MB                       9MB       180MB (love heap managers…)
>
> Memory after show db in GUI
>
> In QT using QSqlQueryModel and
> QAbstractTableModel
> NA                          12MB    450MB
>
>
>
> Runtime to load                with NO DB connection
>
> (release mode)                                 3s
> 3s            9s
>
> Runtime to load with DB inserts
> 210s                       210s       540s
>
> Runtime to show in GUI
> NA                          .5s          3.3s
>
>
>
> Size of data…
>
> ~118k rows of 105 columns of ~50 filled columns.
>
>
>
> BTW.. I cant use BULK IMPORT commands because they are not SQL database
> agnostic.
>
>
>
> Scott
>
>
>
>
>
>
>
>
>
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>
>



-- 
Pau Garcia i Quiles
http://www.elpauer.org
(Due to my workload, I may need 10 days to answer)