Re: Problem with large constant array (Gnat 3.15p)

[Jano <nono@unizar.es>]

Jano dice...
> Hi everybody,
> 
> I'm trying to compile a quite large constant array, generated by
> another tool (namely, awsres from AWS). The array has this form:
> 
> package Example is
> 
>    use Ada.Streams;
> 
>    Content : aliased constant Stream_Element_Array :=
>        (137,  80,  78,  71,  13,  10,  26,  10,   0,   0,   0,  13, 
> 73,  72,
>          68,  82,   0,   0,   0,  14,   0,   0,   0,  14,   8,   3);
> 
> end Example;
> 
> Only that it has about 4.4 millions of elements. The spec file is
> about 25mB in size.
> 
> I'm using a computer with 384mB (win NT) so it may be part of the
> problem. What happens is that gnat1.exe gets as many as 650 mB of
> virtual memory and, after half an hour, it still hasn't finished. I
> wonder if a computer with enough memory to not swap could finish in a
> reasonable time, or if there is some hidden N^2 ruining the
> compilation memory usage/time. I've tried with a plain gnatmake
> without switches to not use any extra feature but it behaves the same.
> 
> Any experiences on this?

Answering to myself: A machine with 1GB/amd2000+ compiles it in about 
30s. It seems the time bottleneck is thus because of memory swapping. I 
cannot say if the >600MB memory usage is reasonable or not but I have 
had reports of another compiler suffering the same problem.