New
LZ4 v1.9.4
LZ4 v1.9.4 is a maintenance release, featuring a substantial amount (~350 commits) of minor fixes and improvements, making it a recommended upgrade. The stable portion of liblz4 API is unmodified, making this release a drop-in replacement for existing features.
Improved decompression speed
Performance wasn't a major focus of this release, but there are nonetheless a few improvements worth mentioning :
- Decompression speed on high-end
ARM64platform is improved, by ~+20%. This is notably the case for recent M1 chips, featured in macbook laptops and nucs. Some server-class ARM64 cpus are also impacted, most notably when employinggccas a compiler. Due to the diversity ofaarch64chips in service, it's still difficult to have a one-size-fits-all policy for this platform. - For the specific scenario of data compressed with
-BD4setting (small blocks, <= 64 KB, linked) decompressed block-by-block into a flush buffer, decompression speed is improved ~+70%. This is most visible in thelz4CLI, which triggers this exact scenario, but since the improvement is achieved at library level, it may also apply to other scenarios. - Additionally, for compressed data employing the format (native format of CLI), it's possible to ignore checksum validation during decompression, resulting in speed improvements of ~+40% . This capability is exposed at both CLI (see ) and library levels.