> Improve the speed of Method.hashCode by caching the hashcode on first use. > I've seen an application where Method.hashCode is a hot path, and this is a > fairly simple speedup. The memory overhead is low. > > This addresses issue > [JDK-8332249](https://bugs.openjdk.org/browse/JDK-8332249). > > Before: > > Benchmark Mode Cnt Score Error Units > # Intel Skylake > MethodHashCode.benchmarkHashCode avgt 5 1.843 ± 0.149 ns/op > # Arm Neoverse N1 > MethodHashCode.benchmarkHashCode avgt 5 2.363 ± 0.091 ns/op > > > > After: > > > Benchmark Mode Cnt Score Error Units > # Intel Skylake > MethodHashCode.benchmarkHashCode avgt 5 1.121 ± 1.189 ns/op > # Arm Neoverse N1 > MethodHashCode.benchmarkHashCode avgt 5 1.001 ± 0.001 ns/op
Sean Gwizdak has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision: - Remove trailing whitespace. - Move hashCode benchmark into the newly created MethodBenchmark file - Merge branch 'master' into method-hashcode-JDK-8332249 - Remove changes to JavaDoc per guidance. - Fix whitespace issues pointed by the bot - Micro-optimize Method.hashCode ------------- Changes: - all: https://git.openjdk.org/jdk/pull/19433/files - new: https://git.openjdk.org/jdk/pull/19433/files/2e4c0c94..4364d99d Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=19433&range=01 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19433&range=00-01 Stats: 30025 lines in 868 files changed: 18155 ins; 7339 del; 4531 mod Patch: https://git.openjdk.org/jdk/pull/19433.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/19433/head:pull/19433 PR: https://git.openjdk.org/jdk/pull/19433
