Performance of dict and ets

Sean Hinde <>
Mon Dec 4 18:38:26 CET 2000


Hi,

Thanks for sharing the results..

> I did some tests a while back when Richard Carlsson presented his
> gb_trees package which gave some very good results compared 
> to dict and
> orddict.  As Björn described ets copies so  to do a fair comparison I
> make sure I also copy when testing other databases.  These are some
> results from my tests.

Was the version of dict in your tests the latest one using hash?

> However, one reason for using dict/pets is the nice meta functions
> fold/filter/merge/update which all work without copying.  The ets
> versions will copy.

I also very much like the filter mechanism, and also like the mechanism in
dict where one can append new entries to an existing entry without reading
it, appending the new value, and then writing the new value back in.

- Sean



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