[fpc-devel] Re: Comparison FPC 2.6.2 - Kylix 3

[Michael Van Canneyt]

On Mon, 4 Mar 2013, Mattias Gaertner wrote:

> On Mon, 4 Mar 2013 15:02:34 +0100 (CET)
> Michael Van Canneyt <michael at freepascal.org> wrote:
>
>>
>>
>> On Mon, 4 Mar 2013, Mattias Gaertner wrote:
>>
>>> On Mon, 4 Mar 2013 14:50:17 +0100
>>> Martin Schreiber <mse00000 at gmail.com> wrote:
>>>
>>>> On Monday 04 March 2013 07:08:25 Martin Schreiber wrote:
>>>>>
>>>>> Both Delphi 7 and Kylix 3 compiled MSEide feel more snappy than their FPC
>>>>> counterpart which is especially surprising for Delphi because Delphi
>>>>> widestrings are not reference counted.
>>>>>
>>>> Some more tests, starting MSEide, loading and highlighting the 277441 lines
>>>> MacOSAll.pas from FPC 2.4.0:
>>>>
>>>> FPC 2.6.2 Windows 3.2..3.5s
>>>> Delphi 7 Windows       4.0s
>>>> FPC 2.6.2 Linux        5.0s
>>>> Kylix 3 Linux          4.0s.
>>>>
>>>> It seems there is actually a benefit of the reference counted Free Pascal
>>>> UnicodeStrings on Windows.
>>>
>>> Any idea, why FPC Linux is slower than FPC Windows?
>>> Loading and highlighting does not sound like a task where many OS calls
>>> are involved.
>>
>> Codepage conversions, most likely: Martin uses UTF-16 everywhere.
>> On Windows, FPC uses the native support for UTF-16.
>> Not exactly sure what happens on Linux.
>
> MacOSAll.pas is 8-bit. On both systems MSEIDE has to convert it to
> UCS-2 (afair not UTF-16).
> Do you mean MSEIDE uses the Widestring manager functions to compare
> tokens?

No idea. 
I am simply proposing possible causes while waiting for my testsuites to finish :-)

The only way to actually know is to measure all various factors:
Evidence-based acting...

Michael.