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- Subject: Re: [ANN] Lua 5.3.2 (rc2) now available
- From: Roberto Ierusalimschy <roberto@...>
- Date: Thu, 26 Nov 2015 13:27:23 -0200
> > I noticed you decreased the maximum array size for sort from 2^50 to
> > 2^40 elements.
> > This actually brings it into range of real life operations. (it's not
> > unheard of to have 46bits of addressable memory now).
> > Though a single threaded sort operation might take a long time with
> > that much data,
> > Imagine the disappointment when your multi-month sort overruns your stack ;)
> Real size is still limited by the size of an 'int', which in most
> machines is 2^31.
Another thing: the comment in the code is wrong. The recursion ends
with size 3 (not 1), so the real limit for a 40-slot stack is (2^42 - 1)
elements. Given that each element in a Lua has 2^4 bytes, we have
~2^46 bytes for the array, leaving little room for software in memory
(assuming 'bits' == byte :-).