juergbi opened a new pull request, #1950:
URL: https://github.com/apache/buildstream/pull/1950
* Add `reserved-disk-space` config option to the `cache` section
BuildStream has been relying on buildbox-casd's default for this, which
is currently set at 2 GB. This adds a config option and sets the default to 5%
of the size of the filesystem as it doesn't seem reasonable to fill up the
filesystem more than 95% by default.
* Add `low-watermark` config option to the `cache` section
BuildStream currently uses a hard-coded value of 50% for the low
watermark. This adds a config option but doesn't change the default. This
requires [buildbox-casd
1.2.17+](https://gitlab.com/BuildGrid/buildbox/buildbox/-/merge_requests/669)
to be effective. Older versions of buildbox-casd will continue to use 50% as
low watermark.
* Change the default `low-watermark` of the cache from 50% to 80%
Pruning half the cache when hitting the cache quota seems excessive as a
default value, resulting in a lower cache hit rate.
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