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features: feature.manyFiles implies fast index writes

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The recent addition of the index.skipHash config option allows index
writes to speed up by skipping the hash computation for the trailing
checksum. This is particularly critical for repositories with many files
at HEAD, so add this config option to two cases where users in that
scenario may opt-in to such behavior:

 1. The feature.manyFiles config option enables some options that are
    helpful for repositories with many files at HEAD.

 2. 'scalar register' and 'scalar reconfigure' set config options that
    optimize for large repositories.

In both of these cases, set index.skipHash=true to gain this
speedup. Add tests that demonstrate the proper way that
index.skipHash=true can override feature.manyFiles=true.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee
2023-01-06 16:31:56 +00:00
committed by Junio C Hamano
parent da9acde14e
commit 17194b195d
6 changed files with 22 additions and 1 deletions
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2
repo-settings.c
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@ -47,6 +47,7 @@ void prepare_repo_settings(struct repository *r)
}
if (manyfiles) {
r->settings.index_version = 4;
r->settings.index_skip_hash = 1;
r->settings.core_untracked_cache = UNTRACKED_CACHE_WRITE;
}
@ -61,6 +62,7 @@ void prepare_repo_settings(struct repository *r)
repo_cfg_bool(r, "pack.usesparse", &r->settings.pack_use_sparse, 1);
repo_cfg_bool(r, "core.multipackindex", &r->settings.core_multi_pack_index, 1);
repo_cfg_bool(r, "index.sparse", &r->settings.sparse_index, 0);
repo_cfg_bool(r, "index.skiphash", &r->settings.index_skip_hash, r->settings.index_skip_hash);
/*
* The GIT_TEST_MULTI_PACK_INDEX variable is special in that