On the OverDrive (AArch64), ‘cuirass remote-worker’ (1.2.0-1.bdc1f9f) says:
starting 2 workers (parallelism: 1 cores) for server at 10.0.0.1 Instead it should use two cores for each worker: --8<---------------cut here---------------start------------->8--- ludo@dover ~$ guile -c '(use-modules (ice-9 threads)) (pk (current-processor-count))' ;;; (4) ludo@dover ~$ guile -c '(use-modules (ice-9 threads)) (pk (ceiling-quotient (current-processor-count) 2))' ;;; (2) ludo@dover ~$ nproc 4 --8<---------------cut here---------------end--------------->8--- Since ‘current-processor-count’ is implemented indirectly in terms of ‘sched_getaffinity’, this suggests that the process starts with a bogus affinity mask. (Time passes…) That’s indeed the case: --8<---------------cut here---------------start------------->8--- ludo@dover ~$ sudo herd status cuirass-remote-worker Status of cuirass-remote-worker: It is started. Running value is 21279. It is enabled. Provides (cuirass-remote-worker). Requires (avahi-daemon guix-daemon networking). Will be respawned. ludo@dover ~$ guile -c '(pk (getaffinity 21279))' ;;; (#*1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000) --8<---------------cut here---------------end--------------->8--- Compare to the affinity mask on x86_64-linux-gnu: --8<---------------cut here---------------start------------->8--- ludo@guix-hpc3 ~$ sudo guile -c '(pk (getaffinity 1817))' ;;; (#*1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000) --8<---------------cut here---------------end--------------->8--- Interesting that the initial affinity mask differs on aarch64-linux-gnu compared to x86_64-linux-gnu. Ludo’.
