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(define (common:unix-ping hostname)
(let ((res (system (conc "ping -c 1 " hostname " > /dev/null"))))
(eq? res 0)))
;; ideally put all this info into the db, no need to preserve it across moving homehost
;;
(define (common:get-least-loaded-host hosts-raw)
(let* ((hosts (filter (lambda (x)
(string-match (regexp "^\\S+$") x))
hosts-raw)))
(if (null? hosts)
#f
;;
;; stategy:
;; sort by last-used and normalized-load
;; if last-updated > 15 seconds then re-update
;; take the host with the lowest load with the lowest last-used (i.e. not used for longest time)
;;
(let ((best-host #f)
(curr-time (current-seconds)))
(for-each
(lambda (hostname)
(let* ((rec (let ((h (hash-table-ref/default *host-loads* hostname #f)))
(if h
h
(let ((h (make-host)))
(hash-table-set! *host-loads* hostname h)
h))))
;; if host hasn't been pinged in 15 sec update it's data
(ping-good (if (< (- curr-time (host-last-update rec)) 15)
(host-reachable rec)
(or (host-reachable rec)
(begin
(host-reachable-set! rec (common:unix-ping hostname))
(host-last-update-set! rec curr-time)
(host-last-cpuload-set! rec (common:get-normalized-cpu-load hostname))
(host-reachable rec))))))
(cond
((not best-host)
(set! best-host hostname))
((and ping-good
(< (alist-ref 'adj-core-load (host-last-cpuload rec))
(alist-ref 'adj-core-load
(host-last-cpuload (hash-table-ref *host-loads* best-host)))))
(set! best-host hostname)))))
hosts)
best-host))))
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(define (common:unix-ping hostname)
(let ((res (system (conc "ping -c 1 " hostname " > /dev/null"))))
(eq? res 0)))
;; ideally put all this info into the db, no need to preserve it across moving homehost
;;
;; return list of
;; ( reachable? cpuload update-time )
(define (common:get-host-info hostname)
(let* ((loadinfo (rmt:get-latest-host-load hostname))
(load (car loadinfo))
(load-sample-time (cdr loadinfo))
(load-sample-age (- (current-seconds) load-sample-time))
(loadinfo-timeout-seconds 20)
(host-last-update-timeout-seconds 10)
(host-rec (hash-table-ref/default *host-loads* hostname #f))
)
(cond
((< load-sample-age loadinfo-timeout-seconds)
;;(print "BB> chr - 1")
(list #t
load-sample-time
load))
((and host-rec
(< (current-seconds) (+ (host-last-update host-rec) host-last-update-timeout-seconds)))
;;(print "BB> chr - 2")
(list #t
(host-last-update host-rec)
(host-last-cpuload host-rec )))
((common:unix-ping hostname)
;;(print "BB> chr - 3 host-rec="host-rec" lu="(if host-rec (- (current-seconds) (host-last-update host-rec)) "None"))
(list #t
(current-seconds)
(alist-ref 'adj-core-load (common:get-normalized-cpu-load hostname))))
(else
(list #f 0 -1)))))
(define (common:update-host-loads-table hosts-raw)
(let* ((hosts (filter (lambda (x)
(string-match (regexp "^\\S+$") x))
hosts-raw)))
(for-each
(lambda (hostname)
(let* ((rec (let ((h (hash-table-ref/default *host-loads* hostname #f)))
(if h
h
(let ((h (make-host)))
(hash-table-set! *host-loads* hostname h)
h))))
(host-info (common:get-host-info hostname))
(is-reachable (car host-info))
(last-reached-time (cadr host-info))
(load (caddr host-info)))
(host-reachable-set! rec is-reachable)
(host-last-update-set! rec last-reached-time)
(host-last-cpuload-set! rec load)))
hosts)))
(define (common:get-least-loaded-host hosts-raw)
(let* ((hosts (filter (lambda (x)
(string-match (regexp "^\\S+$") x))
hosts-raw))
(best-host #f)
(best-load 99999)
(curr-time (current-seconds)))
(common:update-host-loads-table hosts)
(for-each
(lambda (hostname)
(let* ((rec
(let ((h (hash-table-ref/default *host-loads* hostname #f)))
(if h
h
(let ((h (make-host)))
(hash-table-set! *host-loads* hostname h)
h))))
(reachable (host-reachable rec))
(load (host-last-cpuload rec)))
(cond
((not reachable) #f)
((< (+ load (/ (random 250) 1000)) ;; add a random factor to keep from getting in a rut
(+ best-load (/ (random 250) 1000)) )
(set! best-load load)
(set! best-host hostname)))))
hosts)
best-host))
(define (common:wait-for-cpuload maxload numcpus waitdelay #!key (count 1000) (msg #f)(remote-host #f))
(let* ((loadavg (common:get-cpu-load remote-host))
(first (car loadavg))
(next (cadr loadavg))
(adjload (* maxload numcpus))
(loadjmp (- first next)))
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