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(defstruct jstats
(count 0)
(jcount (make-hash-table)) ;; 1.db => journal_count
)
;; timeblk => jstats
(define *journal-stats* (make-hash-table))
;; monte-carlo-esque random sampling of journal files
;; for all the files:
;; if .journal
;; update stats +1 +1
;; update stats +1 0
;;
(define (tt:write-load-tracking dbdir)
(let* ((cs (current-seconds))
(key (inexact->exact (quotient cs 10)))
(old (- key 4)) ;; 4 x 10 seconds ago
(jstat (if (hash-table-exists? *journal-stats* key)
(hash-table-ref *journal-stats* key )
(let ((new (make-jstats)))
(hash-table-set! *journal-stats* key new)
new))))
;; clear out records over 30s old
(for-each
(lambda (key)
(if (< key old)
(hash-table-delete! *journal-stats* key)))
(hash-table-keys *journal-stats*))
;; increment our count of observations
(jstats-count-set! jstat (+ (jstats-count jstat) 1))
;; now find and increment journal file counts
(directory-fold
(lambda (fname res)
;; is it a journal file?
(let ((parts (string-match "^(.*\\.db)-journal.*" fname)))
(match parts
((_ dbfname)
(hash-table-set! (jstats-jcount jstat) dbfname
(+ (hash-table-ref/default (jstats-jcount jstat) dbfname 0) 1)
))
)))
'()
dbdir
)))
;; megatest> (import tcp-transportmod)
;; megatest> (tt:write-load-tracking ".mtdb")
;; megatest> (hash-table-keys *journal-stats*)
;; (172060297)
;; megatest> (jstats->alist (hash-table-ref *journal-stats* 172060297))
;; ((count . 1) (jcount . #<hash-table (1)>))
;; megatest> (jstats-jcount (hash-table-ref *journal-stats* 172060297))
;; #<hash-table (1)>
;; megatest> (hash-table->alist (jstats-jcount (hash-table-ref *journal-stats* 172060297)))
;; (("1.db" . 4))
)
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|
(defstruct jstats
(count 0)
(jcount (make-hash-table)) ;; 1.db => journal_count
)
;; timeblk => jstats
(define *journal-stats* #f) ;; (make-hash-table))
;; monte-carlo-esque random sampling of journal files
;; for all the files:
;; if .journal
;; update stats +1 +1
;; update stats +1 0
;;
(define (tt:write-load-tracking dbdir)
(let* ((cs (current-seconds))
(key (inexact->exact (quotient cs 10)))
(old (- key 5)) ;; 4 x 10 seconds ago
(jstat (if (hash-table-exists? *journal-stats* key)
(hash-table-ref *journal-stats* key )
(let ((new (make-jstats)))
(hash-table-set! *journal-stats* key new)
new))))
;; clear out old records
(for-each
(lambda (key)
(if (< key old)
(hash-table-delete! *journal-stats* key)))
(hash-table-keys *journal-stats*))
;; increment our count of observations
(jstats-count-set! jstat (+ (jstats-count jstat) 1))
;; now find and increment journal file counts
(directory-fold
(lambda (fname res)
;; is it a journal file?
(let ((parts (string-match "^(.*\\.db)-journal.*" fname)))
(match parts
((_ dbfname)
(hash-table-set! (jstats-jcount jstat) dbfname
(+ (hash-table-ref/default (jstats-jcount jstat) dbfname 0) 1)
))
(else #f)
)))
'()
dbdir
)))
(define *journal-stats-mutex* (make-mutex))
(define (tt:journal-stats-run dbdir)
(if (not *journal-stats*)(set! *journal-stats* (make-hash-table)))
(let loop ()
(mutex-lock! *journal-stats-mutex*)
(tt:write-load-tracking dbdir)
(mutex-unlock! *journal-stats-mutex*)
(thread-sleep! (/ (random 1000) 100.0))
(loop)))
;; call this to start a thread that is keeping the journal-stats up to date.
(define (tt:start-stats dbdir)
(thread-start!
(make-thread
(lambda ()(tt:journal-stats-run dbdir)) "Journal stats collection thread")))
(define (tt:get-journal-stats)
(let* ((result (make-jstats))
(hitcounts (jstats-jcount result)))
(if *journal-stats*
(begin
(mutex-lock! *journal-stats-mutex*)
(hash-table-for-each
*journal-stats*
(lambda (k v) ;; key jstats
(let* ((count (jstats-count v))
(jcount (jstats-jcount v))) ;; dbfname => hit count
(jstats-count-set! result
(+ (jstats-count result)
(jstats-count v)))
(hash-table-for-each
jcount
(lambda (dbfname hit-count)
(hash-table-set! hitcounts dbfname
(+ hit-count
(hash-table-ref/default hitcounts dbfname 0))))))))
(mutex-unlock! *journal-stats-mutex*))
(debug:print 0 *default-log-port* "INFO: *journal-stats* not set."))
;; convert to normalized alist
(let ((tot (min (jstats-count result) 1)) ;; avoid divide by zero
(hits (jstats-jcount result))) ;; 1.db => count
(hash-table-map
hits
(lambda (fname hitcount)
(cons fname (/ hitcount tot)))))
))
;; megatest> (import tcp-transportmod)
;; megatest> (tt:write-load-tracking ".mtdb")
;; megatest> (hash-table-keys *journal-stats*)
;; (172060297)
;; megatest> (jstats->alist (hash-table-ref *journal-stats* 172060297))
;; ((count . 1) (jcount . #<hash-table (1)>))
;; megatest> (jstats-jcount (hash-table-ref *journal-stats* 172060297))
;; #<hash-table (1)>
;; megatest> (hash-table->alist (jstats-jcount (hash-table-ref *journal-stats* 172060297)))
;; (("1.db" . 4))
)
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