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During verify_pack() all objects are read for SHA-1 check. Then fsck_sha1() is called on every object, which read the object again (fsck_sha1 -> parse_object -> read_sha1_file). Avoid reading an object twice, do fsck_sha1 while we have an object uncompressed data in verify_pack. On git.git, with this patch I got: $ /usr/bin/time ./git fsck >/dev/null 98.97user 0.90system 1:40.01elapsed 99%CPU (0avgtext+0avgdata 616624maxresident)k 0inputs+0outputs (0major+194186minor)pagefaults 0swaps Without it: $ /usr/bin/time ./git fsck >/dev/null 231.23user 2.35system 3:53.82elapsed 99%CPU (0avgtext+0avgdata 636688maxresident)k 0inputs+0outputs (0major+461629minor)pagefaults 0swaps Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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