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In fact, this IS significant overhead. In my real case, the overhead is about 100 % but parallelizing with 4 threads gives more total throughput than the serial solution: Elapsed time with parallel is less than without when using one process handling each pipe as you suggest and what I did in my real word problem.

Juergen
– Juergen

2023-11-03 19:55:10 +00:00
Commented Nov 3, 2023 at 19:55
The parallel elapsed time is minimized when processing largest files first which is done by ls -S /var/lib/apt/lists/*lz4 | parallel ... (or as you did with ... | xargs -P). But this might not be helpful in your case where the number of threads is as large as the number of files (4 threads and 8 files for me, 1.1 GB compressed and 13 GB decompressed).

Juergen
– Juergen

2023-11-03 20:18:55 +00:00
Commented Nov 3, 2023 at 20:18

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