[fpc-devel] Benchmark for FreePascal

Marc Weustink marc.weustink at cuperus.nl
Wed Dec 14 18:46:22 CET 2005

Jonas Maebe wrote:
> On 14 dec 2005, at 18:33, Marc Weustink wrote:
>>> In my test (Mac OS X/PPC, rtl and program compiled with register   
>>> variables, text buffer of 64kb) readln's overheid is negligible.  
>>> The  large cost comes from writeln. The reason the C version is so  
>>> much  faster is because its output is buffered as well. We  
>>> automatically  flush the output after each writeln (i.e. after  each 
>>> writeln of 60  characters), while in C this only happens at  the very 
>>> end of the  program for 128kb of characters at a time.
>> Another speed improvement will be disabling IO checks for write, {$I-}
> That code only takes 0.5% of the time, not really relevant.

OK, in some other benchmarks I got a (imo) serious ~10-20% speed 
improvement by doing so (and all pieces help:)


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