On Fri, Aug 18, 2023 at 11:12 AM Christian Göttsche <cgzones@xxxxxxxxxxxxxx> wrote: > > The number of buckets is calculated by performing a binary AND against > the mask of the hash table, which is one less than its size (which is a > power of two). This leads to all top bits being discarded, requiring > for short or similar inputs a hash function with a good avalanche > effect. > > Use djb2a: > > # current > common prefixes: 7 entries and 5/8 buckets used, longest chain length 2, sum of chain length^2 11 > classes: 134 entries and 100/256 buckets used, longest chain length 5, sum of chain length^2 234 > roles: 15 entries and 6/16 buckets used, longest chain length 5, sum of chain length^2 57 > types: 4448 entries and 3016/8192 buckets used, longest chain length 41, sum of chain length^2 14922 > users: 7 entries and 3/8 buckets used, longest chain length 3, sum of chain length^2 17 > bools: 306 entries and 221/512 buckets used, longest chain length 4, sum of chain length^2 524 > levels: 1 entries and 1/1 buckets used, longest chain length 1, sum of chain length^2 1 > categories: 1024 entries and 400/1024 buckets used, longest chain length 4, sum of chain length^2 2740 > > # patch > common prefixes: 7 entries and 5/8 buckets used, longest chain length 2, sum of chain length^2 11 > classes: 134 entries and 101/256 buckets used, longest chain length 3, sum of chain length^2 210 > roles: 15 entries and 9/16 buckets used, longest chain length 3, sum of chain length^2 31 > types: 4448 entries and 3459/8192 buckets used, longest chain length 5, sum of chain length^2 6778 > users: 7 entries and 5/8 buckets used, longest chain length 3, sum of chain length^2 13 > bools: 306 entries and 236/512 buckets used, longest chain length 5, sum of chain length^2 470 > levels: 1 entries and 1/1 buckets used, longest chain length 1, sum of chain length^2 1 > categories: 1024 entries and 518/1024 buckets used, longest chain length 7, sum of chain length^2 2992 > > Signed-off-by: Christian Göttsche <cgzones@xxxxxxxxxxxxxx> Assuming this is in fact public domain, Reviewed-by: Stephen Smalley <stephen.smalley.work@xxxxxxxxx>
