`--window-memory=0` makes memory usage unlimited, which is the
default.
---max-pack-size=<n>::
- Maximum size of each output packfile, expressed in MiB.
+--max-pack-size=[N]::
+ Maximum size of each output pack file. The size can be suffixed with
+ "k", "m", or "g". The minimum size allowed is limited to 1 MiB.
If specified, multiple packfiles may be created.
The default is unlimited, unless the config variable
`pack.packSizeLimit` is set.