[fpc-pascal] Why is cthreads unit not included by default

Mattias Gaertner nc-gaertnma at netcologne.de
Thu Aug 27 19:08:10 CEST 2009

On Thu, 27 Aug 2009 18:57:58 +0200
Jonas Maebe <jonas.maebe at elis.ugent.be> wrote:

> On 27 Aug 2009, at 18:55, Jonas Maebe wrote:
> > Without saying what this command line application and this LCL  
> > application do exactly, it's kind of hard to understand this  
> > conclusion.
> Oh, now I see that the procedure was put below :) That it's quicker  
> with cmem is reasonably logical: FPC's heap manager is not very good  
> at reallocating memory.

What reallocating memory do you mean?

  for i:=1 to 500000000 do begin

I only change reference counters, don't I?

> I didn't see any timings for the command line app in your post
> though. 

That was in the very first post of this thread:

Under my Linux machine the above program takes about 7.5 seconds.
Uncomment the cthreads unit: 7.5 seconds

Under OS X the above program takes on my mac book about 15 seconds.
Uncomment the cthreads unit: 21 seconds

> I guess the difference between the command line and LCL app
> is simply due to alignment differences, causing different cache
> behaviour.


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