q66andYu Watanabe
621b10fe2c
This allows us to reserve a bunch of capacity ahead of time, improving the performance of hwdb significantly thanks to not having to reallocate so many times. Before: ``` $ sudo time valgrind --leak-check=full ./systemd-hwdb update ==113297== Memcheck, a memory error detector ==113297== Copyright (C) 2002-2024, and GNU GPL'd, by Julian Seward et al. ==113297== Using Valgrind-3.23.0 and LibVEX; rerun with -h for copyright info ==113297== Command: ./systemd-hwdb update ==113297== ==113297== ==113297== HEAP SUMMARY: ==113297== in use at exit: 0 bytes in 0 blocks ==113297== total heap usage: 1,412,640 allocs, 1,412,640 frees, 117,920,009,195 bytes allocated ==113297== ==113297== All heap blocks were freed -- no leaks are possible ==113297== ==113297== For lists of detected and suppressed errors, rerun with: -s ==113297== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) 132.44user 21.15system 2:35.61elapsed 98%CPU (0avgtext+0avgdata 228560maxresident)k 0inputs+25296outputs (0major+6886930minor)pagefaults 0swaps ``` After: ``` $ sudo time valgrind --leak-check=full ./systemd-hwdb update ==112572== Memcheck, a memory error detector ==112572== Copyright (C) 2002-2024, and GNU GPL'd, by Julian Seward et al. ==112572== Using Valgrind-3.23.0 and LibVEX; rerun with -h for copyright info ==112572== Command: ./systemd-hwdb update ==112572== ==112572== ==112572== HEAP SUMMARY: ==112572== in use at exit: 0 bytes in 0 blocks ==112572== total heap usage: 1,320,113 allocs, 1,320,113 frees, 70,614,501 bytes allocated ==112572== ==112572== All heap blocks were freed -- no leaks are possible ==112572== ==112572== For lists of detected and suppressed errors, rerun with: -s ==112572== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) 21.94user 0.19system 0:22.23elapsed 99%CPU (0avgtext+0avgdata 229876maxresident)k 0inputs+25264outputs (0major+57275minor)pagefaults 0swaps ``` Co-authored-by: Yu Watanabe <watanabe.yu+github@gmail.com>
System and Service Manager
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