[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 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.

Another source of slow-down may be file search: Windows ignores case. 
Linux does not -> depending on what you do, you need to search 3 times more files.

Michael.