Vito Caputo
5d4ba7f2b3
This changes real_journal_next() to leverage the IteratedCache for accelerating iteration across the open journal files. journalctl timing comparisons with 100 journal files of 8MiB size party to this boot: Pre (~v235): # time ./journalctl -b --no-pager > /dev/null real 0m9.613s user 0m9.560s sys 0m0.053s # time ./journalctl -b --no-pager > /dev/null real 0m9.548s user 0m9.525s sys 0m0.023s # time ./journalctl -b --no-pager > /dev/null real 0m9.612s user 0m9.582s sys 0m0.030s Post-IteratedCache: # time ./journalctl -b --no-pager > /dev/null real 0m8.449s user 0m8.425s sys 0m0.024s # time ./journalctl -b --no-pager > /dev/null real 0m8.409s user 0m8.382s sys 0m0.027s # time ./journalctl -b --no-pager > /dev/null real 0m8.410s user 0m8.350s sys 0m0.061s ~12.5% improvement, the benefit increases the more log files there are.
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