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Reimplement oidset using khash.h in order to reduce its memory footprint and make it faster. Performance of a command that mainly checks for duplicate objects using an oidset, with master and Clang 6.0.1: $ cmd="./git-cat-file --batch-all-objects --unordered --buffer --batch-check='%(objectname)'" $ /usr/bin/time $cmd >/dev/null 0.22user 0.03system 0:00.25elapsed 99%CPU (0avgtext+0avgdata 48484maxresident)k 0inputs+0outputs (0major+11204minor)pagefaults 0swaps $ hyperfine "$cmd" Benchmark #1: ./git-cat-file --batch-all-objects --unordered --buffer --batch-check='%(objectname)' Time (mean ± σ): 250.0 ms ± 6.0 ms [User: 225.9 ms, System: 23.6 ms] Range (min … max): 242.0 ms … 261.1 ms And with this patch: $ /usr/bin/time $cmd >/dev/null 0.14user 0.00system 0:00.15elapsed 100%CPU (0avgtext+0avgdata 41396maxresident)k 0inputs+0outputs (0major+8318minor)pagefaults 0swaps $ hyperfine "$cmd" Benchmark #1: ./git-cat-file --batch-all-objects --unordered --buffer --batch-check='%(objectname)' Time (mean ± σ): 151.9 ms ± 4.9 ms [User: 130.5 ms, System: 21.2 ms] Range (min … max): 148.2 ms … 170.4 ms Initial-patch-by: Jeff King <peff@peff.net> Signed-off-by: Rene Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
31 lines
629 B
C
31 lines
629 B
C
#include "cache.h"
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#include "oidset.h"
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int oidset_contains(const struct oidset *set, const struct object_id *oid)
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{
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khiter_t pos = kh_get_oid(&set->set, *oid);
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return pos != kh_end(&set->set);
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}
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int oidset_insert(struct oidset *set, const struct object_id *oid)
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{
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int added;
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kh_put_oid(&set->set, *oid, &added);
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return !added;
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}
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int oidset_remove(struct oidset *set, const struct object_id *oid)
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{
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khiter_t pos = kh_get_oid(&set->set, *oid);
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if (pos == kh_end(&set->set))
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return 0;
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kh_del_oid(&set->set, pos);
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return 1;
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}
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void oidset_clear(struct oidset *set)
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{
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kh_release_oid(&set->set);
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oidset_init(set, 0);
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}
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