[Debian-salsa-ci] ccache stats and performance evaluation (in CI contexts)

[Santiago Ruano Rincón]

Hello Joel and ccache developers team,

Thanks a lot for your useful project!

The debian's salsa CI project [salsaci] uses ccache as a way to reduce
building time, obviously in the CI build jobs. And I would like a to
ask you a question regarding how to handle the stats betweens job runs.

From ccache(1) and the troubleshooting section, it is possible to read:

   Performance
       ...

       A good way of monitoring how well ccache works is to run ccache
       -s before and after your build and then compare the statistics
       counters. …

Would you mind enlighten us about: is it a good idea to also reset/zero
the stats between two different jobs?

[salsaci] https://salsa.debian.org/salsa-ci-team/pipeline/

Thank you,

  -- Santiago
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