[fpc-pascal] Maximum of memory which can be used by single program in 32 bit Windows

[Rainer Stratmann]

Is there a different behaviour on linux?

I guess there is no limit...(!?)


Am Donnerstag, 19. Mai 2016, 08:46:57 schrieb LacaK:
> >> another question: is there any limit in FPC, which causes that only cca
> >> 1GB of memory can be used by FPC ?
> > 
> > No, but there is one that limits to 2GB.
> 
> Yes
> 
> > With {$peflags $20} in the main file that is increasable to 3GB
> > (reportedly 4GB for 32-bits apps under 64-bit windows, but I never tested
> > that)
> 
> Wow I never heared about such option.
> This are my results:
> (compiled application is Win 32 bit)
> 
> Before I have used this flag:
>    Win7 32 bit with 4GB RAM: Out of memory at approx. 1 GB
>    Win7 64 bit with 4GB RAM: Out of memory at approx. 1 GB
> 
> After I have used this flag:
>    Win7 32 bit with 4GB RAM: Out of memory at 1 GB (no difference)
>    Win7 64 bit with 4GB RAM: Success! (application consumes approx 1.8
> GB RAM, 1GB remains free)
> 
> Strange, does not ?
> Why I still encounter 1 GB limit and not 2 GB without {$setpeflag $20} ?
> Why on Win32 I still get Out of memory also with {$setpeflag $20} , but
> not on Win64 ?
> Take into account, that both OSes have 4GB RAM and application is same.
> 
> According to
> https://msdn.microsoft.com/en-us/library/windows/desktop/aa366778%28v=vs.85%
> 29.aspx it should be 2GB on 32bit and 4GB on 64bit Windows with
> *IMAGE_FILE_LARGE_ADDRESS_AWARE*
> 
> -Laco.
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