Performance Optimization: How a 185-Microsecond Type Hint Boosted Throughput 13× in Clojure Roughtime Implementation
By
kianN
Hand-rolled, kettle-boiled, baked to perfection. Worth every minute at the bakery.
Summary
The article describes a performance optimization in a Clojure implementation of the Roughtime protocol, where a seemingly trivial change to type hints resulted in a 13× throughput increase. The author explains how adding a 185-microsecond type hint to a function dramatically improved performance by helping the JVM compiler generate more efficient bytecode. The article details the technical investigation process, including benchmarking, profiling, and analyzing JVM bytecode to understand why this small change had such a significant impact on the cryptographic time synchronization protocol's performance.
Key quotes
· 4 pulledHow a 'trivial' change yielded a 13× throughput increase.
The server replies with a signed certificate containing both the nonce and a timestamp, proving the response happened after the request.
Responses can be chained together with provable ordering; if any server's timestamps are inconsistent with that ordering, that server is cryptographically 'outed' as unreliable.
When a client asks for the time, it sends a random nonce.
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