Pavel's diary

"ccache" effect on repeated builds

Just to proof my experimentally gained feeling, I did the exact measurement of ccache usage effect.

I measured five parallel (10/4) builds and the average values is in the following graph:



Build times are one hour, one hour and 3 minutes and 27 minutes. So the worst case with ccache and cold cache where ccache is populating the cache took 3 minutes (1/20th of the total build time).

This is the last part of our "highly accurate measurements of random and inaccurate build times configuration" series (1, 2, 3, 4, 5). I'd again like to thank David Richards for his wonderful service and the possibility to test this machine.