u3: adds bump allocation on inner roads#1037
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This PR will need to be updated to reflect #1015 once it's merged. |
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This PR implements a bump allocator (
u3a_flag_sand) and enables it by default on all inner roads (this can be disabled before road entry withu3o_no_sand), targeting #1036. Included microbenchmarks show rougly 2x performance increase in cons and refcounting relative to the status quo.Bump-allocating is not viable for some workloads -- compiling hoon.hoon used roughly 6GB on my machine. Enabling it by default would require explicit opt-out in several scenarios, it's likely safer to make it explicitly opt-in. Either scenario will require "user-space" control via a hint or somesuch.