Armaan Sandhu
8adaac7f29
journal_entry_to_json() builds a fresh hashmap for every entry and then fills it with that entry's fields, of which there are typically around twenty. Since the hashmap starts out empty it has to grow several times per entry, and every growth rehashes everything inserted so far. journalctl -o json spent about a quarter of its time in siphash, a third of that under resize_buckets(). Reserve room up front. On a 730M journal spread over 100 files, journalctl -o json -n 200000 goes from 5.71s to 4.64s.
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