Reviewed parallel merge#4381
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klirichek wants to merge 14 commits into
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Only progressive is in game from now
route MergeTwoChunks to MergeNChunks
with batch = 32 and having 40 chunks - it optimized to 40-32+1=9 despite cutoff. Now it decrease batch size on the edge pass to obey cutoff
two threads can't simultaneously start optimize same set of chunks; one will always see if they were occupied even if it is happened 'right now' .
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#4091
reviewed
N-way merge picked 'as is'
removed 'standard' optimize (left only progressive).
reworked parallel (multi-threading) merge