diff options
Diffstat (limited to 'guix/scripts/offload.scm')
| -rw-r--r-- | guix/scripts/offload.scm | 36 |
1 files changed, 33 insertions, 3 deletions
diff --git a/guix/scripts/offload.scm b/guix/scripts/offload.scm index 00a145e5e9..e48e31547a 100644 --- a/guix/scripts/offload.scm +++ b/guix/scripts/offload.scm @@ -268,15 +268,45 @@ success, #f otherwise." "Return #t if M1 is faster than M2." (> (build-machine-speed m1) (build-machine-speed m2))) +(define (machine-load machine) + "Return the load of MACHINE, divided by the number of parallel builds +allowed on MACHINE." + (let* ((pipe (remote-pipe machine OPEN_READ `("cat" "/proc/loadavg"))) + (line (read-line pipe))) + (close-pipe pipe) + (if (eof-object? line) + 1. + (match (string-tokenize line) + ((one five fifteen . _) + (let* ((raw (string->number five)) + (jobs (build-machine-parallel-builds machine)) + (normalized (/ raw jobs))) + (format (current-error-port) "load on machine '~a' is ~s\ + (normalized: ~s)~%" + (build-machine-name machine) raw normalized) + normalized)) + (_ + 1.))))) + +(define (machine-less-loaded? m1 m2) + "Return #t if the load on M1 is lower than that on M2." + (< (machine-load m1) (machine-load m2))) + +(define (machine-less-loaded-or-faster? m1 m2) + "Return #t if M1 is either less loaded or faster than M2." + (or (machine-less-loaded? m1 m2) + (machine-faster? m1 m2))) + (define (choose-build-machine requirements machines) "Return the best machine among MACHINES fulfilling REQUIREMENTS, or #f." - ;; FIXME: Take machine load into account, and/or shuffle MACHINES. (let ((machines (sort (filter (cut machine-matches? <> requirements) machines) - machine-faster?))) + machine-less-loaded-or-faster?))) (match machines ((head . _) - head) + ;; Return the best machine unless it's already overloaded. + (and (< (machine-load head) 2.) + head)) (_ #f)))) (define* (process-request wants-local? system drv features |