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Memoize queryReferrers()

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This commit is contained in:
Eelco Dolstra 2021-10-15 12:20:23 +02:00
parent 17e6ebcc90
commit 304180d0de
1 changed files with 11 additions and 3 deletions
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14
src/libstore/gc.cc
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@ -617,6 +617,8 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
}
};
std::map<StorePath, StorePathSet> referrersCache;
/* Helper function that visits all paths reachable from `start`
via the referrers edges and optionally derivers and derivation
output edges. If none of those paths are roots, then all
@ -689,9 +691,14 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
if (isValidPath(*path)) {
/* Visit the referrers of this path. */
StorePathSet referrers;
queryReferrers(*path, referrers);
for (auto & p : referrers)
auto i = referrersCache.find(*path);
if (i == referrersCache.end()) {
StorePathSet referrers;
queryReferrers(*path, referrers);
referrersCache.emplace(*path, std::move(referrers));
i = referrersCache.find(*path);
}
for (auto & p : i->second)
enqueue(p);
/* If keep-derivations is set and this is a
@ -718,6 +725,7 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
if (shouldDelete) {
invalidatePathChecked(path);
deleteFromStore(path.to_string());
referrersCache.erase(path);
}
}
};