What Governs Decode Throughput in Absolute-Offset GPU LZ77? A Work-Granularity Mechanism and an Encode-Time Min-Match-Length Lever
Through controlled ablations on an NVIDIA H100 it is shown that decode throughput is governed not by occupancy, compute, address scatter, or launch parallelism, but by work granularity: throughput is a function of the average match length, because a short match leaves most lanes of a cooperating warp idle.