Commits on Jul 26, 2022

1. Improve AccountID string conversion caching: …

   Caching the base58check encoded version of an `AccountID` has
   performance advantages, because because of the computationally
   heavy cost associated with the conversion, which requires the
   application of SHA-256 twice.
   
   This commit makes the cache significantly more efficient in terms
   of memory used: it eliminates the map, using a vector with a size
   that is determined by the configured size of the node, and a hash
   function to directly map any given `AccountID` to a specific slot
   in the cache; the eviction policy is simple: in case of collision
   the existing entry is removed and replaced with the new data.
   
   Previously, use of the cache was optional and required additional
   effort by the programmer. Now the cache is automatic and does not
   require any additional work or information.
   
   The new cache also utilizes a 64-way spinlock, to help reduce any
   contention that the pressure on the cache would impose.

   

   nbougalis committed Jul 26, 2022
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