lzbench
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inikep
ZSTD Levels
ZSTD expanded their range of compression levels to include negative integers. The current "max" (-5) pushes it into LZ4 territory. I would make a pull request, but I'm not sure how many additional levels you want to test by default.
Currently -eall uses zstd,1,2,5,8,11,15,18,22. I would add -1, -3, -5 but it depends if there is a big difference in speed/ratio between these levels.
Currently -eall uses zstd,1,2,5,8,11,15,18,22.
Why those breakpoints? #3 is the default speed and #19 is the highest before you have to add the --ultra flag....
I would add -1, -3, -5 but it depends if there is a big difference in speed/ratio between these levels
Fast mode beats Snappy and LZO on all counts, while -4 and -5 makes it competitive with LZ4. From the ZSTD 1.3.4 release notes:
| name | ratio | compression | decompression |
|---|---|---|---|
| zstd 1.3.4 --fast=5 | 1.996 | 770 MB/s | 2060 MB/s |
| lz4 1.8.1 | 2.101 | 750 MB/s | 3700 MB/s |
| zstd 1.3.4 --fast=4 | 2.068 | 720 MB/s | 2000 MB/s |
| zstd 1.3.4 --fast=3 | 2.153 | 675 MB/s | 1930 MB/s |
| lzo1x 2.09 -1 | 2.108 | 640 MB/s | 810 MB/s |
| zstd 1.3.4 --fast=2 | 2.265 | 610 MB/s | 1830 MB/s |
| snappy 1.1.4 | 2.091 | 530 MB/s | 1820 MB/s |
| zstd 1.3.4 --fast=1 | 2.431 | 530 MB/s | 1770 MB/s |