[fpc-pascal] Memory Size

Jonas Maebe jonas.maebe at elis.ugent.be
Fri Apr 3 09:38:06 CEST 2009

On 03 Apr 2009, at 02:34, Markus Glugla wrote:

> I need the available memory (heap). At that time the functions  
> maxavail
> or memavail did this. I read that I should use GetFPCHeapStatus and
> other function currently.
> This functions produce allways zero!! What can I do? What is wrong?
> I use fpc version 2.2.0 [2008/05/27] for i386.

On which OS? And what happens if you allocate some memory at the start  
of your program?

Anyway, even if it would return non-zero values, the information would  
be next to useless. The reason is that on modern OS'es, available  
physical memory is dynamically divided between the disk cache and  
applications, with a lower limit on the disk cache. What would you  
expect memavail to report? The current amount of really "free" memory?  
Free + cache? Free + part of cache? Free + non-wired (i.e., swappable)  
+ part of cache? Free + non-wired + part of cache + swap space?

The information provided by GetFPCHeapStatus is only useful to get  
statistics about the heap manager, and not to get any information  
about the system you are running on.


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