On Tue, 4 May 2021 13:07:34 GMT, Jason Zaugg <jza...@openjdk.org> wrote:
> If the given Path represents a file, use the overload of read defined > in FileChannel that accepts an explicit position and avoid serializing > reads. > > Note: The underlying NIO implementation is not required to implement > FileChannel.read(ByteBuffer, long) concurrently; Windows still appears > to lock, as it returns true for NativeDispatcher.needsPositionLock. > > > On MacOS X, the enclosed benchmark improves from: > > > Benchmark Mode Cnt Score Error Units > ZipFileSystemBenchmark.read avgt 10 75.311 ? 3.301 ms/op > > > To: > > > Benchmark Mode Cnt Score Error Units > ZipFileSystemBenchmark.read avgt 10 12.520 ? 0.875 ms/op This pull request has now been integrated. Changeset: 0a12605d Author: Jason Zaugg <jza...@openjdk.org> Committer: Lance Andersen <lan...@openjdk.org> URL: https://git.openjdk.java.net/jdk/commit/0a12605df893d782867529812b1d8c10380f603c Stats: 108 lines in 3 files changed: 95 ins; 7 del; 6 mod 8265448: (zipfs): Reduce read contention in ZipFileSystem Reviewed-by: alanb, lancea ------------- PR: https://git.openjdk.java.net/jdk/pull/3853
