[darcs-users] Memory usage of record in darcs-hs

Petr Rockai me at mornfall.net
Thu Sep 17 14:24:35 UTC 2009

Jason Dagit <dagit at codersbase.com> writes:
> With darcs-hs the story is quite a bit different.  The physical ram usage is
> about 365megs, but the run time was around 100 seconds.
(In case someone interested in this didn't yet figure out the problem: looking
at the profiles, zipTrees is a top CPU monger, and if you look at its
definition it's clear why -- the definition is probably the naivest possible --
O(n^2) and also too strict, so it's just matter of writing one that is both
more efficient (can be done in nlogn) and more lazy... I'll get to it


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