From 88da0b6888ad37454132b17fb58f0fbd9e0ce6b5 Mon Sep 17 00:00:00 2001 From: Ludovic Courtès Date: Sun, 9 Mar 2014 14:05:30 +0100 Subject: offload: Distinguish between 'decline' and 'postpone'. * guix/scripts/offload.scm (transfer-and-offload): New procedure, with core formerly in 'process-request'. (choose-build-machine): Remove 'requirements' parameter. (process-request): Reply 'decline' when none of MACHINES matches the requirements, and 'postpone' when MACHINES are busy. --- guix/scripts/offload.scm | 109 +++++++++++++++++++++++++++++------------------ 1 file changed, 67 insertions(+), 42 deletions(-) diff --git a/guix/scripts/offload.scm b/guix/scripts/offload.scm index e1da31af5d..dffc3e9fd2 100644 --- a/guix/scripts/offload.scm +++ b/guix/scripts/offload.scm @@ -199,6 +199,43 @@ there, and write the build log to LOG-PORT. Return the exit status." (close-pipe pipe))) +(define* (transfer-and-offload drv machine + #:key + (inputs '()) + (outputs '()) + (max-silent-time 3600) + (build-timeout 7200) + print-build-trace?) + "Offload DRV to MACHINE. Prior to the actual offloading, transfer all of +INPUTS to MACHINE; if building DRV succeeds, retrieve all of OUTPUTS from +MACHINE." + ;; Acquire MACHINE's exclusive lock to serialize file transfers + ;; to/from MACHINE in the presence of several 'offload' hook + ;; instance. + (when (with-machine-lock machine 'bandwidth + (send-files (cons (derivation-file-name drv) inputs) + machine)) + (let ((status (offload drv machine + #:print-build-trace? print-build-trace? + #:max-silent-time max-silent-time + #:build-timeout build-timeout))) + (if (zero? status) + (begin + ;; Likewise (see above.) + (with-machine-lock machine 'bandwidth + (retrieve-files outputs machine)) + (format (current-error-port) + "done with offloaded '~a'~%" + (derivation-file-name drv))) + (begin + (format (current-error-port) + "derivation '~a' offloaded to '~a' failed \ +with exit code ~a~%" + (derivation-file-name drv) + (build-machine-name machine) + (status:exit-val status)) + (primitive-exit (status:exit-val status))))))) + (define (send-files files machine) "Send the subset of FILES that's missing to MACHINE's store. Return #t on success, #f otherwise." @@ -387,8 +424,8 @@ connections allowed to MACHINE." ;; List of acquired build slots (open ports). '()) -(define (choose-build-machine requirements machines) - "Return the best machine among MACHINES fulfilling REQUIREMENTS, or #f." +(define (choose-build-machine machines) + "Return the best machine among MACHINES, or #f." ;; Proceed like this: ;; 1. Acquire the global machine-choice lock. @@ -411,9 +448,7 @@ connections allowed to MACHINE." (and (pred machine) (list machine slot))))) - (let ((machines+slots (sort (filter (undecorate - (cut machine-matches? <> requirements)) - machines+slots) + (let ((machines+slots (sort machines+slots (undecorate machine-less-loaded-or-faster?)))) (match machines+slots (((best slot) (others slots) ...) @@ -436,43 +471,33 @@ connections allowed to MACHINE." print-build-trace? (max-silent-time 3600) (build-timeout 7200)) "Process a request to build DRV." - (let* ((local? (and wants-local? (string=? system (%current-system)))) - (reqs (build-requirements - (system system) - (features features))) - (machine (choose-build-machine reqs (build-machines)))) - (if machine - (begin - (display "# accept\n") - (let ((inputs (string-tokenize (read-line))) - (outputs (string-tokenize (read-line)))) - ;; Acquire MACHINE's exclusive lock to serialize file transfers - ;; to/from MACHINE in the presence of several 'offload' hook - ;; instance. - (when (with-machine-lock machine 'bandwidth - (send-files (cons (derivation-file-name drv) inputs) - machine)) - (let ((status (offload drv machine - #:print-build-trace? print-build-trace? - #:max-silent-time max-silent-time - #:build-timeout build-timeout))) - (if (zero? status) - (begin - ;; Likewise (see above.) - (with-machine-lock machine 'bandwidth - (retrieve-files outputs machine)) - (format (current-error-port) - "done with offloaded '~a'~%" - (derivation-file-name drv))) - (begin - (format (current-error-port) - "derivation '~a' offloaded to '~a' failed \ -with exit code ~a~%" - (derivation-file-name drv) - (build-machine-name machine) - (status:exit-val status)) - (primitive-exit (status:exit-val status)))))))) - (display "# decline\n")))) + (let* ((local? (and wants-local? (string=? system (%current-system)))) + (reqs (build-requirements + (system system) + (features features))) + (candidates (filter (cut machine-matches? <> reqs) + (build-machines)))) + (match candidates + (() + ;; We'll never be able to match REQS. + (display "# decline\n")) + ((_ ...) + (let ((machine (choose-build-machine candidates))) + (if machine + (begin + ;; Offload DRV to MACHINE. + (display "# accept\n") + (let ((inputs (string-tokenize (read-line))) + (outputs (string-tokenize (read-line)))) + (transfer-and-offload drv machine + #:inputs inputs + #:outputs outputs + #:max-silent-time max-silent-time + #:build-timeout build-timeout + #:print-build-trace? print-build-trace?))) + + ;; Not now, all the machines are busy. + (display "# postpone\n"))))))) (define-syntax-rule (with-nar-error-handling body ...) "Execute BODY with any &nar-error suitably reported to the user." -- cgit 1.4.1