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Date: Fri, 22 Jun 2012 13:10:12 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: begin/end reducing memory consumption?
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Date: 2012-06-22T13:10:13+02:00
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On 22.06.12 11:08, Anonymous wrote:
> What I don't get is that if I comment out the above "begin/end" lines,
> then memory usage increases with No_iterations and for No_iterations = 8 
> reaches about 550 MB. Including begin/end reduces memory usage to 37MB (then independent of No_iterations, as it should be).

This is mere speculation:

The block statement makes some variables "more" local
and the implementation of Vectors can perform some memory
management.


I'd try -O2 -funroll-loops [-gnatn], too, replacing -O3.

(Some oddly related information (or maybe not having something
to do with this at all) may be available if you have GCC
-fdump-tree-slp-details. I have seen some decisions reported
there to do with exceptions handling being obstacles;
that was FSF GNAT, though, GNAT GPL seemed "better", and
the issue might be gone with most recent FSF GNATs.)