On 11.06.2012 16:11, Roman D. Boiko wrote:
On Tuesday, 5 June 2012 at 13:27:12 UTC, Roman D. Boiko wrote:
maybe it is better to avoid immutability... or do bulk ins /del before
copy.
Would it be difficult to introduce two optimizations:
* have strings of all lengths above configurable threshold go to the
same bucket (is it reasonable?)
The sample I listed did just that: for length >= 64 it goes to bucket of
0-length strings. After all it's your prefix function, with any
distribution you like ;)
* have ability to store a checkpoint, then do a series of modifications,
and store another checkpoint but reuse data which have not been affected.
yea, that's a rough sketch of what I want to support.
For the second optimization a possible design would be to store internal
state as snapshot + diffs, and apply diffs when creating another
snapshot. Diff format should allow efficiently performing trie interface
operations.
It may be. Diff could be a bunch of pages that are XOR-ed on top of
snapshot. Dunno if it's worthwhile trick yet.
--
Dmitry Olshansky
