Sorry for the delay, got entangled on some other issues.

What I found is that Cache-Limit gets defaulted to either 16M (in apt-
pkg/pkgcachegen.cc, at function pkgMakeStatusCache, or to 12M (same
source, function  pkgMakeOnlyStatusCache.

So... I think you are correct. I have not stopped to find how much
memory gets used by the MMAPped list, but it stands to reason that as
the number of lists increase, we will probably get larger MMAP usage.

Nevertheless, I would expect that doubling the default should be
sufficient for most. In your case (and I did the same when I found this
bug) you are between 8 and 10 times larger -- we really should not need
that much.

-- 
apt-get and apt-cache  Segmentation fault (core dumped)
https://bugs.launchpad.net/bugs/113424
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