174 lines
6.0 KiB
Racket
174 lines
6.0 KiB
Racket
#lang racket/base
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(require racket/match)
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(require racket/tcp)
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(require racket/cmdline)
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(require logbook)
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(define server-entry-name (standard-logbook-entry-name))
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(define server-entry-type #f)
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(define server-hostname "localhost")
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(define server-port 5999)
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(define max-waypoint 1000)
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(command-line #:program "echo-client.rkt"
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#:once-each
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["--max-waypoint" n
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"set maximum waypoint for this run"
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(set! max-waypoint (string->number n))]
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["--host" name
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"set hostname of server to contact"
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(set! server-hostname name)]
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["--port" number
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"set TCP port of server to contact"
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(set! server-port (string->number number))]
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["--logbook-entry-name" name
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"set logbook entry name to use when recording run statistics"
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(set! server-entry-name name)]
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["--logbook-entry-type" type
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"set logbook entry type to use"
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(set! server-entry-type type)])
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(when (not server-entry-type)
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(error 'echo-client "Please supply the --logbook-entry-type command-line argument."))
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(define L (default-logbook))
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(define E (logbook-entry L "minimart" server-entry-name server-entry-type))
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(when (not (logbook-machine-info-recorded? E))
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(logbook-record-machine-info! E))
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(define Tgrowth (logbook-table E "client-grow-times" #:column-spec '(initial-count
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wallclock-secs/connection
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connections/wallclock-sec
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cpu+gc-sec
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wallclock-sec
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gc-sec
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final-count)))
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(define Tping (logbook-table E "client-ping-times" #:column-spec '(connection-count
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secs/roundtrip
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roundtrips/sec
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roundtrip-count
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run-duration-sec)))
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(define Tsummary (logbook-table E "client-summary" #:column-spec #f))
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;; We work our way through these waypoints: start with one connection,
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;; then 10, then 20, etc etc until we reach the end.
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(define waypoints
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(list* 1 2 5
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(let loop ((n 10))
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(if (>= n 30000)
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'()
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(cons (inexact->exact (round n))
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(loop (* n (sqrt (sqrt 2))))))))
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;; (list 1 10 20 30 40 50 60 70 80 90 100 120
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;; 150 200 210 220 230 240 250 260 270 280 290 300 400
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;; 500 600 700 800 900
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;; ;; Here on up, increase by ~1.2× each time
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;; 1000 1200 1440 1728 2073
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;; 2488 2985 3583 4299 5159
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;; 6191 7430 8916 10699 12839
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;; 15407 18488 22186 26623)
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)
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;; We exchange pings with the server for this many milliseconds before
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;; moving up to the next waypoint.
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(define ping-time 10000)
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;; The ports representing a single connection.
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(struct c (in out) #:transparent)
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(define next-connection-id 0)
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(define connections (hash))
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;; Current number of open connections.
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(define (connection-count)
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(hash-count connections))
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;; Ping a connection.
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(define (ping-connection n)
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(match-define (c in out) (hash-ref connections n))
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(display "ping\n" out)
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(flush-output out)
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(define reply (read-line in 'any))
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(when (not (equal? reply "ping"))
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(error 'ping-connection "Bogus reply ~v from connection ~a" reply n)))
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;; Choose a connection at random, and ping it.
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(define (ping-one-at-random)
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(ping-connection (random (connection-count))))
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;; Start one connection.
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(define (start-connection)
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(define i next-connection-id)
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(set! next-connection-id (+ i 1))
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(define-values (in out) (tcp-connect server-hostname server-port))
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(set! connections (hash-set connections i (c in out))))
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;; Ping random connections for ping-time milliseconds.
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(define (ping-randomly [record-results? #t])
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(define start-time (current-inexact-milliseconds))
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(let loop ((count 0))
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(ping-one-at-random)
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(define now (current-inexact-milliseconds))
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(if (< now (+ start-time ping-time))
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(loop (+ count 1))
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(when record-results?
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(let* ((elapsed-sec (/ (- now start-time) 1000.0))
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(roundtrip-latency (if (zero? count)
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elapsed-sec
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(/ elapsed-sec count))))
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(write-logbook-datum! Tping (list (connection-count)
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roundtrip-latency
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(if (zero? roundtrip-latency) 0 (/ 1.0 roundtrip-latency))
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count
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elapsed-sec)))))))
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;; Add connections until we hit the given waypoint.
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(define (grow-to-waypoint waypoint)
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(define old-count (connection-count))
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(collect-garbage)
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(collect-garbage)
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(collect-garbage)
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(define-values (ignorable-results cpu+gc-time wallclock-time gc-time)
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(time-apply
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(lambda ()
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(let loop ()
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(when (< (connection-count) waypoint)
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(start-connection)
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(loop)))
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(ping-connection (- waypoint 1))) ;; make sure the newest connection is really live.
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'()))
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(define cpu+gc-sec (/ cpu+gc-time 1000.0))
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(define wallclock-sec (/ wallclock-time 1000.0))
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(define gc-sec (/ gc-time 1000.0))
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(write-logbook-datum! Tgrowth (list old-count
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(/ wallclock-sec (- waypoint old-count))
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(if (zero? wallclock-sec) 0 (/ (- waypoint old-count) wallclock-sec))
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cpu+gc-sec
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wallclock-sec
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gc-sec
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waypoint)))
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(let loop ((remaining-waypoints waypoints))
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(match remaining-waypoints
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['() (void)]
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[(cons next-waypoint rest)
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(when (<= next-waypoint max-waypoint)
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(printf "Moving to waypoint ~a\n" next-waypoint)
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(grow-to-waypoint next-waypoint)
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(when (equal? remaining-waypoints waypoints) ;; First ever waypoint. Do some warmup.
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(printf "Warming up.\n")
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(ping-randomly #f)
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(printf "Warmup complete. Proceeding with real measurements.\n"))
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(printf "At waypoint ~a\n" next-waypoint)
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(ping-randomly)
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(loop rest))]))
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(let ()
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(write-logbook-datum! Tsummary #:label "server-hostname" server-hostname)
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(write-logbook-datum! Tsummary #:label "server-port" server-port)
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(write-logbook-datum! Tsummary #:label "ping-time" ping-time)
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(write-logbook-datum! Tsummary #:label "max-waypoint" max-waypoint)
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(write-logbook-datum! Tsummary #:label "waypoints" waypoints)
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(printf "echo-client finished.\n")
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(void))
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