ZStandard Presets - Githubissues

indolering commented 4 years ago

Your default levels for ZSTD seem a little wonky:

TURBO: ZSTD is missing, it should be -5 | --fast=5 (the fastest level currently available). This should push it into LZ4 territory.
EFFICIENT should probably include 3, ZSTD's default level.
OPTIMAL (meaning best trade off?) should probably be 20, as 22 balloons memory usage and requires another flag in order to use it.

You might want to comment the .ini file, as it's not clear what each preset means (like BWT). Also, the README mentions includes a FASTEST preset the turbobench.ini file only has TURBO.

powturbo commented 3 years ago

turbobench.ini is only an example, you can make your own preferred settings.

indolering commented 2 years ago

If this is what you use for the headline results listed in the project's README, then leaving the defaults as-is misleads the reader.

powturbo commented 2 years ago

I'll test and add your options for zstd when I make a new update the next time

indolering commented 2 years ago

Great! Looking over things again, I think I need to refactor my recommendations.

I'm not sure your intent for the TURBO/FAST/EFFICIENT/MAX/OPTIMAL categories are, but here is what settings I think match your intent while showing off the full range of ZSTD performance points:

TURBO: The fastest possible? Apparently, ZSTD supports --fast=7 now. I'm away from my Linux machine, but it looks like supplying an even higher number would be automatically fixed. You could supply 10 or 99 if you don't want to bother fixing it everytime ZSTD releases a new --fast setting.
FAST: it seems like FAST would be --fast=1, the default when passing just --fast. Maybe level -1 as well?
EFFICIENT: probably 3 (the default) and 5.
You use the 22 preset in both MAX and OPTIMAL. 22 is a non-standard setting that third party decoders are allowed to reject because it can result in a DOS attack. It should still be included as it shows the maximum compression ZSTD can do, but probably not in both settings.... 19 is the universally compatible variant.
In your summary table, just list the --fast settings as negative values.

TL;DR: --fast=99/1, -1/3/5/19, and --ultra -22

powturbo / TurboBench

ZStandard Presets #22