this post was submitted on 30 Mar 2026
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Programming

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How would you design parallel grep for huge JSONL files? (lemmy.world)
submitted 20 hours ago by dhruv3006@lemmy.world to c/programming@programming.dev
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I need to scan very large JSONL files efficiently and am considering a parallel grep-style approach over line-delimited text.

Would love to hear how you would design it.

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[–] pelya@lemmy.world 3 points 16 hours ago

One additinal trick is to compress your files before writing them to disk, using some kind of fast lightweight compression like parallel gzip (pigz command) or lzop. When parsing them, you will have smaller disk reads but higher CPU usage, which will give speed advantage if you have server-class CPU with lots of cache.