Hello Guix, I’ve been looking for ways to make evaluations (computing the derivation of every package for every supported architecture, like Hydra and Cuirass do) faster.
I measured evaluations with: rm -rf /tmp/cache hydra-jobs.scm mkdir /tmp/cache XDG_CACHE_HOME=/tmp/cache make hydra-jobs.scm Currently build-aux/hydra/gnu-system.scm, which performs the evaluation work, turns on auto-compile such that every Guix module gets compiled. I measured with 2.2.3 the impact of turning off auto-compilation for everything but the core modules (meaning that package modules get interpreted instead) and surprisingly, this is slower than compiling everything: * 2.2.3, auto-compile everything minus (system base compile) & co. 1362.79user 3.35system 20:59.40elapsed 108%CPU (0avgtext+0avgdata 1201444maxresident)k 0inputs+203560outputs (0major+285018minor)pagefaults 0swaps * 2.2.3, auto-compile (guix packages) only 2462.05user 3.69system 39:26.05elapsed 104%CPU (0avgtext+0avgdata 2121532maxresident)k 128inputs+36568outputs (0major+242281minor)pagefaults 0swaps * 2.2.3, auto-compile ((guix packages) (guix build-system gnu) (guix download)) 2364.22user 3.21system 37:44.45elapsed 104%CPU (0avgtext+0avgdata 2061496maxresident)k 256inputs+41800outputs (0major+236514minor)pagefaults 0swaps I guess the extra source properties that are retained when evaluating account for part the space and time overhead, but I’m not sure this explains everything. Andy, what do you think of this? Thanks, Ludo’.
