thodg/libgit2/tests/odb/sorting.c
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Hash : a0a1b19a
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Date : 2015-10-14T19:31:54
odb: Prioritize alternate backends For most real use cases, repositories with alternates use them as main object storage. Checking the alternate for objects before the main repository should result in measurable speedups. Because of this, we're changing the sorting algorithm to prioritize alternates *in cases where two backends have the same priority*. This means that the pack backend for the alternate will be checked before the pack backend for the main repository *but* both of them will be checked before any loose backends.
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tests/odb/sorting.c
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#include "clar_libgit2.h" #include "git2/sys/odb_backend.h" typedef struct { git_odb_backend base; size_t position; } fake_backend; static git_odb_backend *new_backend(size_t position) { fake_backend *b; b = git__calloc(1, sizeof(fake_backend)); if (b == NULL) return NULL; b->base.free = (void (*)(git_odb_backend *)) git__free; b->base.version = GIT_ODB_BACKEND_VERSION; b->position = position; return (git_odb_backend *)b; } static void check_backend_sorting(git_odb *odb) { size_t i, max_i = git_odb_num_backends(odb); fake_backend *internal; for (i = 0; i < max_i; ++i) { cl_git_pass(git_odb_get_backend((git_odb_backend **)&internal, odb, i)); cl_assert(internal != NULL); cl_assert_equal_sz(i, internal->position); } } static git_odb *_odb; void test_odb_sorting__initialize(void) { cl_git_pass(git_odb_new(&_odb)); } void test_odb_sorting__cleanup(void) { git_odb_free(_odb); _odb = NULL; } void test_odb_sorting__basic_backends_sorting(void) { cl_git_pass(git_odb_add_backend(_odb, new_backend(0), 5)); cl_git_pass(git_odb_add_backend(_odb, new_backend(2), 3)); cl_git_pass(git_odb_add_backend(_odb, new_backend(1), 4)); cl_git_pass(git_odb_add_backend(_odb, new_backend(3), 1)); check_backend_sorting(_odb); } void test_odb_sorting__alternate_backends_sorting(void) { cl_git_pass(git_odb_add_backend(_odb, new_backend(1), 5)); cl_git_pass(git_odb_add_backend(_odb, new_backend(5), 3)); cl_git_pass(git_odb_add_backend(_odb, new_backend(3), 4)); cl_git_pass(git_odb_add_backend(_odb, new_backend(7), 1)); cl_git_pass(git_odb_add_alternate(_odb, new_backend(0), 5)); cl_git_pass(git_odb_add_alternate(_odb, new_backend(4), 3)); cl_git_pass(git_odb_add_alternate(_odb, new_backend(2), 4)); cl_git_pass(git_odb_add_alternate(_odb, new_backend(6), 1)); check_backend_sorting(_odb); }