ZPCompress is used in most use cases when a sort or copy has SMS version 1 compression attributes on SORTIN or SORTOUT (non-VSAM, non-OUTFIL) data sets.
When reading or writing SMS-compressed data sets, CPU time typically increases significantly while DASD usage and elapsed time are reduced dramatically. ZPCompress reduces the CPU time of compression/decompression by offloading this processing to zIIP engines – performing 100% compatible decompression on SORTIN and 100% compatible compression for SORTOUT while achieving the equivalent reductions in DASD usage and elapsed time.
Benchmark tests for ZPCompress demonstrate:
- Between 80% and 90% reduction in CPU time