~/talk

String Enhancements in JDK 9

on YouTube 09m
Talkat Jfokus 2016 · 2016-02-08..02-10· [java]

speaker

name:Aleksey Shipilev
website:https://shipilev.net/

resources

video:https://youtu.be/_evzaAkd594
slides:none on file

summary

Benchmarks run with JMH and a GC profiler on JDK 9 Early Access builds (B92 baseline, B93 with compact strings, B104 adding the indy string concat call) show concrete wins: baseline allocates ~1.5KB per concat, compact strings drops that to ~800B, and enabling the inline_size strategy for indy concat cuts allocations ~3x and doubles throughput (over 2x faster) on a real microbenchmark. Compact strings is transparent on upgrade; indy concat requires one recompilation or jlink bytecode rewrite to get the full benefit.

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