bounds for --adapt mode

can supply min and max compression level through advanced command : --adapt=min=#,max=#
2018-09-25 16:03:28 -07:00
parent 04f47bbdd2
commit 6c51bf420c
5 changed files with 90 additions and 18 deletions
@@ -134,9 +134,10 @@ the last one takes effect.
    This mode is the only one available when multithread support is disabled.
    Single-thread mode features lower memory usage.
    Final compressed result is slightly different from `-T1`.
-* `--adapt` :
+* `--adapt[=min=#,max=#]` :
    `zstd` will dynamically adapt compression level to perceived I/O conditions.
    Compression level adaptation can be observed live by using command `-v`.
+    Adaptation can be constrained between supplied `min` and `max` levels.
    The feature works when combined with multi-threading and `--long` mode.
    It does not work with `--single-thread`.
    It sets window size to 8 MB by default (can be changed manually, see `wlog`).