# Falls Sie eine Website erwarten, aber diesen # Abschnitt lesen können, löschen Sie bitte das # _index.htmx_limit-rate # vom Ende der Adresszeile. Danke! Lang: de Title: limit-rate: Shell-Skript zur Geschwindigkeitsbegrenzung eines (Datei-/Pipe-)Transfervorgangs Short Title: limit-rate: (Datei-/Pipe-)Transfer verlangsamen Publication date: 2015-07 Meta: en Title: limit-rate: Shell script to limit the speed of a (file/pipe) transfer. Short Title: limit-rate: slow down (file/pipe) transfer +INFO +usage >>INFO de 1.0

limit-rate: Shell-Skript zur Geschwindigkeitsbegrenzung eines (Datei-/Pipe-)Transfervorgangs

Nachdem ich vor kurzem lines/getline hochgeladen habe, kommt jetzt ein viel cooleres Shell-Skript an die Reihe: limit-rate.

Seine Aufgabe ist es, die Geschwindigkeit eines Transfers, der ein Dateikopiervorgang sein kann, aber auch über Pipes laufen kann, zu steuern (d. h. zu verlangsamen).

Im Kern wird die folgende Technik angewandt:

Das Skript ist natürlich ganz und gar nicht ausgereift. Als Anwender muss man es ggf. an die Anforderungen und an das jeweilige System anpassen (z. B. noch kürzere Zeitabstände erlauben.)

Die Funktionsweise ist mit dem Beispielaufruf (unten) schön visualisiert. Viel Spaß beim Ausprobieren!

Hinweis: die Nutzung ist nur privat, d. h. im kleinen Rahmen, gestattet.

<< INFO de >>INFO en 0.8

limit-rate: shell skript for the speed surveillance of a (file/pipe) transfer

After having uploaded lines/getline recently, now I upload another nice thing: limit-rate!

It's task is to control (i. e. to slow down) the speed of a transfer (can be a file copy operation or a pipe transfer).

The main technique used for that is:

Unfortunately the script is not finished at all. As user you may need to adapt it to your requirements and the actual system. (E. g. allow even shorter time periods than set up by default.)

How it works is visualized below by a nices sample run. Have fun playing with the script!

Remark: only use the program in a private scope.

<< INFO en >> usage de 1.0

Verwendung (Linux, BSD, Windows (cygwin), OS X (?)):

  1. Herunterladen: Version 1.03
  2. In ein neues/leeres Verzeichnis (!) entpacken (Unpack into an empty dir!)
  3. Uund ... ausführen! 
    # (echo 1000 >RATE.tmp; sleep 10; echo 800000 >RATE.tmp) & sleep 0.2; ./limit-rate.sh src=/.../Filme/.../big-movie-file.avi tgt=/dev/null ratefile=RATE.tmp
[4] 25579
./limit-rate.sh: src = '/.../Filme/.../big-movie-file.avi'
./limit-rate.sh: tgt = '/dev/null'
./limit-rate.sh: rate = 1024 B/s
copy-file: rate:    15360/    [15360]/     1024      -> time 100, dd_bs   1024
copy-file: rate:     8192/     [8192]/     1000      -> time 200, dd_bs   1024
copy-file: rate:     5120/     [5120]/     1000      -> time 400, dd_bs   1024
copy-file: rate:     2048/     [2048]/     1000      -> time 400, dd_bs    512
copy-file: rate:     1536/     [1536]/     1000      -> time 400, dd_bs    256
copy-file: rate:      512/      [512]/     1000      -> time 200, dd_bs    256
copy-file: rate:     1024/     [1024]/     1000      -> time 220, dd_bs    231
copy-file: rate:      924/      [924]/     1000      -> time 198, dd_bs    254
copy-file: rate:     1270/     [1270]/     1000      -> time 217, dd_bs    229
copy-file: rate:      916/      [916]/     1000      -> time 196, dd_bs    251
copy-file: rate:     1255/     [1255]/   800000      -> time  98, dd_bs    251
copy-file: rate:     1757/     [1757]/   800000      -> time  49, dd_bs    251
copy-file: rate:     3514/     [3514]/   800000      -> time  24, dd_bs    251
copy-file: rate:     5271/     [5271]/   800000      -> time  12, dd_bs    251
copy-file: rate:     7028/     [7028]/   800000      -> time  12, dd_bs    502
copy-file: rate:    14558/    [14558]/   800000      -> time  12, dd_bs   1004
copy-file: rate:    28112/    [28112]/   800000      -> time  12, dd_bs   2008
copy-file: rate:    58232/    [58232]/   800000      -> time  12, dd_bs   4016
copy-file: rate:   116464/   [116464]/   800000      -> time  12, dd_bs   8032
copy-file: rate:   224896/   [224896]/   800000      -> time  12, dd_bs  16064
copy-file: rate:   449792/   [449792]/   800000      -> time  12, dd_bs  32128
copy-file: rate:   899584/   [899584]/   800000      -> time  13, dd_bs  28916
copy-file: rate:   809648/   [809648]/   800000      -> time  14, dd_bs  26025
copy-file: rate:   702675/   [702675]/   800000      -> time  13, dd_bs  28627
copy-file: rate:   744302/   [744302]/   800000      -> time  12, dd_bs  31489
copy-file: rate:   881692/   [881692]/   800000      -> time  13, dd_bs  28341
copy-file: rate:   793548/   [793548]/   800000      -> time  12, dd_bs  31175
copy-file: rate:   872900/   [872900]/   800000      -> time  13, dd_bs  28058
copy-file: rate:   757566/   [757566]/   800000      -> time  12, dd_bs  30863
copy-file: rate:   833301/   [833301]/   800000      -> time  13, dd_bs  27777
copy-file: rate:   722202/   [722202]/   800000      -> time  12, dd_bs  30554
copy-file: rate:   886066/   [886066]/   800000      -> time  13, dd_bs  27499
^C[4]+  Fertig                  ( echo 1000 > RATE.tmp; sleep 10; echo 800000 > RATE.tmp )

 130  ((echo 1000 >RATE.tmp; sleep 10; echo 800000 >RATE.tmp) & sleep 0.2; ....)
#
<< usage de