netty5/codec
Aleksey Yeschenko 93414db1f3 Fix LZ4 encoder/decoder performance with (default) xxHash32 (#9249)
Motivation:

Lz4FrameEncoder and Lz4FrameDecoder in their default configuration use
an extremely inefficient way to checksum direct byte buffers. In
particular, for every byte checksummed, a single-element byte array is
being allocated and a JNI cal is made, which in some internal testing
makes a 25x difference in total throughput and allocates *a lot* of
garbage.

Modifications:

Lz4XXHash32, an implementation of ByteBufChecksum specifically for use
by Lz4FrameEncoder and Lz4FrameDecoder, is introduced. It utilises
xxHash32 block API which provides a hash() method that accepts a
ByteBuffer as an argument. Lz4FrameEncoder and Lz4FrameDecoder are
modified to use this implementation by default.

Result:

Lz4FrameEncoder and Lz4FrameDecoder perform well again when operating
on direct byte buffers with default checksum configuration; a public
implementation is provided for those who need to override the seed.
2019-06-18 09:29:25 +02:00
..
src Fix LZ4 encoder/decoder performance with (default) xxHash32 (#9249) 2019-06-18 09:29:25 +02:00
pom.xml [maven-release-plugin] prepare for next development iteration 2019-04-30 16:42:29 +00:00