Periodically deleting disk_cache and difference with remote cache server?

[Amit]

Hello there,

We run Bazel on a CI environment, and we use --disk_cache and --repository_cache to save some information on a persistent storage, so builds will be running faster.

That's quite a big project, so the cache size (both disk_cache and repository_cache) is something like 2.5GB. There's a lot of daily builds going on, and the cache grows fast (perhaps a bit too fast - I'm investigating it). It can reach 6-7G.

The information at the Bazel sites mentioned nothing managed --disk_cache, and it's your responsibility to periodically do cache cleaning. 

I wonder if anyone else is already doing that - and if perhaps a remote cache server is a better option - as it's being managed better then what I can get with `disk_cache`.

Thanks!

[Austin Schuh]

We did that by a short snippet of bash which does a rm -rf
~/.cache/bazel/disk_cache (or wherever you point it) if the disk usage
is > 80%. It runs both at the beginning of each CI run with a
threshold of like 95, and nightly with a lower threshold.

Austin

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