ares/notes/notes-~2021.9.23.md

Notes ~2021.9.23

Discussion with ~rovnys-ricfer

• Some discussion of the memory model, in particular using tag bits to identify
  • direct noun
  • indirect noun
  • pointer to cell
  • hash table reference
• Hash table ejection strategy
  • When the copier is returning a noun, it counts how many iterations of copying it has performed
  • Above a tunable threshhold, an entry in the hash table is made and the noun is copied there instead.
  • Existing pointers into the hash table are copied and re-inserted as new entries, thus maintaining an invariant that a hash table entry can only reference its own memory by a direct pointer, or another hash table entry, by hash reference.
  • nouns that require metadata (jet pointers, cached bytecode) are ejected to the hashtable
  • hashtable can also store non-noun data such as bytecode
  • TBD: a collection strategy for the hash table.

Infrastructure channel discussion

• Interpreter should handle nock 12 with an extra input of a scry gate stack, so it can be used to jet +mink
• Also need to return crash values from the interpreter, and build traces when passing through nock 11.
• ~master-morzod objects to calling the machine code from JIT compilation "automatic jets" and is probably right.