SZx: an Ultra-fast Error-bounded Lossy Compressor for Scientific Datasets

TL;DR

SZx introduces an ultra-fast error-bounded lossy compressor for scientific datasets, achieving significantly higher speeds than existing methods on CPU and GPU while maintaining reasonable compression ratios.

Contribution

The paper presents UFZ, a novel lightweight compression framework that is both ultra-fast and effective, optimized for CPU and GPU architectures, with comprehensive evaluation on real datasets.

Findings

UFZ is 2-16X faster than existing compressors on CPU and GPU.

UFZ maintains high compression ratios with lightweight operations.

Evaluation on six real-world datasets demonstrates its efficiency.

Abstract

Today's scientific high performance computing (HPC) applications or advanced instruments are producing vast volumes of data across a wide range of domains, which introduces a serious burden on data transfer and storage. Error-bounded lossy compression has been developed and widely used in scientific community, because not only can it significantly reduce the data volumes but it can also strictly control the data distortion based on the use-specified error bound. Existing lossy compressors, however, cannot offer ultra-fast compression speed, which is highly demanded by quite a few applications or use-cases (such as in-memory compression and online instrument data compression). In this paper, we propose a novel ultra-fast error-bounded lossy compressor, which can obtain fairly high compression performance on both CPU and GPU, also with reasonably high compression ratios. The key contributions are three-fold: (1) We propose a novel, generic ultra-fast error-bounded lossy compression framework -- called UFZ, by confining our design to be composed of only super-lightweight operations such as bitwise and addition/subtraction operation, still keeping a certain high compression ratio. (2) We implement UFZ on both CPU and GPU and optimize the performance according to their architectures carefully. (3) We perform a comprehensive evaluation with 6 real-world production-level scientific datasets on both CPU and GPU. Experiments show that UFZ is 2~16X as fast as the second-fastest existing error-bounded lossy compressor (either SZ or ZFP) on CPU and GPU, with respect to both compression and decompression.