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perf: shrink global statements cache to size if mostly empty #1769

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Merged
levkk merged 1 commit into from
Oct 9, 2026
Merged

perf: shrink global statements cache to size if mostly empty #1769

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12 changes: 12 additions & 0 deletions pgdog/src/frontend/prepared_statements/global_cache.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -310,6 +310,18 @@ impl GlobalCache {
// unused will hold the remaining elements that was not extracted above
self.unused = unused;

// Shrink when the map is less than 25% full.
let shrink = self.statements.len() < self.statements.capacity() / 4;

// Give the allocator a chance to clean up,
// especially after large bursts of new statements.
if shrink {
self.unused.shrink_to_fit();
self.statements.shrink_to_fit();
self.cross_shard_variants.shrink_to_fit();
self.names.shrink_to_fit();
}

removed
}

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