What is LRU::Cache in Perl?

LRU::Cache is a CPAN module implementing a fixed-size Least Recently Used cache in C via XS, with O(1) get/set/peek/delete ops up to 45M/sec.

How do I install and use LRU::Cache?

Run `cpanm LRU::Cache`. Then: `my $cache = LRU::Cache::new(1000); $cache->set('key', $val);` Or import funcs for max speed.

Is LRU::Cache faster than pure Perl caches?

Yes, 5-20x faster per benchmarks, thanks to custom C ops bypassing Perl dispatch overhead.

📦 Open Source

LRU::Cache: The C-Powered Speed Demon Rescuing Perl's Caching Woes

Perl's caching game just got a turbo boost. LRU::Cache ditches slow Perl hashes for pure C speed, hitting 45 million sets per second. But why now, and does it matter?

theAIcatchup Apr 08, 2026 4 min read

Benchmark table comparing LRU::Cache speeds vs pure Perl and XS methods

⚡ Key Takeaways

LRU::Cache delivers O(1) cache ops in XS C, hitting 45M sets/sec — 20x pure Perl. 𝕏
Function-style API uses Perl's call checkers for direct C jumps, slashing method overhead. 𝕏
Ideal for wrapping expensive ops like DNS/DB queries; auto-evicts least-used entries. 𝕏

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#CPAN #LRU Cache #Perl #XS Performance

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Originally reported by dev.to

⚡ Key Takeaways

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