... thus confirming that, indeed, this is an I/O-bound process that benefits quite substantially from parallelism at (at least...) a factor of x4. As would be expected.

No. Throwing memory at a IO speeds up processing. Throwing threads at memory, speeds splitting.

In reply to Re^3: Optimise file line by line parsing, substitute SPLIT by Anonymous Monk
in thread Optimise file line by line parsing, substitute SPLIT by go9kata

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