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(else
(let ((res (* 50 (exp (- x targ)))))
(cond
((and (> res 0)(< res 0.01)) 0.01)
((> res 45) 45) ;; cap at 45 seconds
(else res))))))
(define (piecewise-droop-calc x targ)
(let ((top 50))
(cond
((> (- x targ) 0) top) ;; top off at 45 seconds
((> x (- targ top))(+ (* 1 (- x (- targ top)))(/ (- top targ) targ)))
(else (let ((res (/ x targ)))
(if (< res 0.01)
0.01
res))))))
(define (server soc)
(print "server starting")
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(else
(let ((res (* 50 (exp (- x targ)))))
(cond
((and (> res 0)(< res 0.01)) 0.01)
((> res 45) 45) ;; cap at 45 seconds
(else res))))))
;; x input value (current number in the queue)
;; targ is the desired queue length
;;
(define (piecewise-droop-calc x targ)
(let ((top 50))
(cond
((> (- x targ) 0)
top) ;; top off at top seconds
((> x (- targ top))
(+ (* 1 (- x (- targ top)))
(/ (- top targ) targ)))
(else (let ((res (/ x targ)))
(if (< res 0.01)
0.01
res))))))
(define (server soc)
(print "server starting")
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(define *current-delay-mutex* (make-mutex))
;; update the *current-delay* value every minute or QUEUE_CHK_DELAY seconds
(thread-start! (make-thread (lambda ()
(let ((delay-time (string->number (or (get-environment-variable "QUEUE_CHK_DELAY") "30"))))
(let loop ()
(with-input-from-pipe
cmd
(lambda ()
(let* ((val (read))
(droop-val (if (number? val)(piecewise-droop-calc val queuelen) #f)))
;; val is number of jobs in queue. Use a linear droop of val/40
(mutex-lock! *current-delay-mutex*)
(set! *current-delay* (or droop-val 30)) ;; (/ (or droop-val 100) 50))
(mutex-unlock! *current-delay-mutex*)
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(define *current-delay-mutex* (make-mutex))
;; update the *current-delay* value every minute or QUEUE_CHK_DELAY seconds
(thread-start! (make-thread (lambda ()
(let ((delay-time (string->number (or (get-environment-variable "QUEUE_CHK_DELAY") "30"))))
(let loop ()
(with-input-from-pipe
cmd ;;; my query to get queue length
(lambda ()
(let* ((val (read))
(droop-val (if (number? val)(piecewise-droop-calc val queuelen) #f)))
;; val is number of jobs in queue. Use a linear droop of val/40
(mutex-lock! *current-delay-mutex*)
(set! *current-delay* (or droop-val 30)) ;; (/ (or droop-val 100) 50))
(mutex-unlock! *current-delay-mutex*)
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