UCS/RCACHE: add UCX_RCACHE_MERGE_ADJACENT=[y/n] to merge adjacent region of rcache #102
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What
add UCX_RCACHE_MERGE_ADJACENT=[y/n] to merge adjacent region of rcache
Why
if user send many contiguous memory, now ucx will register once for each. we need merge adjacent region to reduce register times.
How
in rcache, the memory region is [start, end), so if we use [start-1, end+1], the adjacent region will intersect.