weaselab/conflict-set
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Fix induction (again). Now it's 176 bytes per key
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Tests / Release [gcc,aarch64] total: 931, passed: 931
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Andrew Noyes
2024-03-13 07:26:49 -07:00
parent ef802b8acd
commit b779c0f6f7
1 changed files with 11 additions and 9 deletions
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ConflictSet.cpp
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@@ -265,20 +265,22 @@ std::string getSearchPathPrintable(Node *n);
// Bound memory usage following the analysis in the ART paper // Bound memory usage following the analysis in the ART paper
constexpr int kBytesPerKey = 120; constexpr int kBytesPerKey = 176;
constexpr int kMinSavingsPerNode = 120;
constexpr int kMinChildrenNode4 = 2; constexpr int kMinChildrenNode4 = 2;
constexpr int kMinChildrenNode16 = 5; constexpr int kMinChildrenNode16 = 5;
constexpr int kMinChildrenNode48 = 17; constexpr int kMinChildrenNode48 = 17;
constexpr int kMinChildrenNode256 = 49; constexpr int kMinChildrenNode256 = 49;
static_assert(sizeof(Node256) + kBytesPerKey <= static_assert(sizeof(Node256) + kMinSavingsPerNode <=
kMinChildrenNode256 * kBytesPerKey); kMinChildrenNode256 * kMinSavingsPerNode);
static_assert(sizeof(Node48) + kBytesPerKey <= static_assert(sizeof(Node48) + kMinSavingsPerNode <=
kMinChildrenNode48 * kBytesPerKey); kMinChildrenNode48 * kMinSavingsPerNode);
static_assert(sizeof(Node16) + kBytesPerKey <= static_assert(sizeof(Node16) + kMinSavingsPerNode <=
kMinChildrenNode16 * kBytesPerKey); kMinChildrenNode16 * kMinSavingsPerNode);
static_assert(sizeof(Node4) + kBytesPerKey <= kMinChildrenNode4 * kBytesPerKey); static_assert(sizeof(Node4) + kMinSavingsPerNode <=
static_assert(sizeof(Node0) <= kBytesPerKey); kMinChildrenNode4 * kMinSavingsPerNode);
static_assert(sizeof(Node0) + kMinSavingsPerNode <= kBytesPerKey);
// setOldestVersion will additionally try to maintain this property: // setOldestVersion will additionally try to maintain this property:
// `max(children, 1) * length >= capacity` // `max(children, 1) * length >= capacity`