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Mojo struct
Lamport
struct Lamport
Sizing and state-block layout for the barrier-free Lamport comm region.
The single source of truth these values derive from: Signal (sync.mojo)
sizes its embedded region from here, and the kernel reads the pack/state
layout from here, instead of restating the arithmetic at each site. Holds
only what is independent of Signal and MAX_GPUS (so lamport.mojo keeps
no dependency on sync.mojo); Signal composes the full region size from
MAX_SMALL_MESSAGE_BYTES x MAX_GPUS x LamportGeneration.NUM_GENERATIONS.
Implemented traits
comptime members
ATOMIC_BYTES
comptime ATOMIC_BYTES = 16
The 128-bit single-copy-atomic pack width the sentinel protocol needs.
MAX_PACKS
comptime MAX_PACKS = 65536
MAX_SMALL_MESSAGE_BYTES in 128-bit packs; the per-slot generation stride.
MAX_SMALL_MESSAGE_BYTES
comptime MAX_SMALL_MESSAGE_BYTES = 1048576
Largest per-rank message a Lamport generation slot reserves for (bytes) -- the small/large dispatch ceiling. 1 MiB is the measured B200 crossover.
STATE_ARRIVAL
comptime STATE_ARRIVAL = 2
STATE_FLAG
comptime STATE_FLAG = 0
STATE_LEN
comptime STATE_LEN = 4
STATE_PREV_ELEMS
comptime STATE_PREV_ELEMS = 1