Make Checksummer faster and more correct #1693
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The new implementation is faster because of two reasons: - It more aggressively avoids calculating checksums of already-calculated items - It effectfully updates a hash rather than using Immutable::Set It is also more correct because it replaces use of <recur> with a numerical reference to a previously-seen object. Each newly checksummed object will have a number suffix, e.g. `Array#5<…>`. Each previously seen object will have an @-reference, e.g. `Array#9<@4,@5,>`. This will invalidate existing stored checksums in Nanoc sites, but it is unavoidable and worth the tradeoff.
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Detailed description
The new implementation is faster because of two reasons:
Preliminary tests suggest a 30% speedup, but I have not at all tested this out properly.
It is also more correct because it replaces use of with a numerical reference to a previously-seen object.
Each newly checksummed object will have a number suffix, e.g.
Array#5<…>. Each previously seen object will have an @-reference, e.g.Array#9<@4,@5,>.This will invalidate existing stored checksums in Nanoc sites, but it is unavoidable and worth the tradeoff.
To do
Related issues
This does not fix #1692 yet, but it brings the checksummer in a better state to handle it.