Re: Useful tip: simulate slow internet access on a fast LAN
Re: Useful tip: simulate slow internet access on a fast LAN
- Subject: Re: Useful tip: simulate slow internet access on a fast LAN
- From: Miguel Arroz <email@hidden>
- Date: Wed, 09 Mar 2011 18:40:03 +0000
| Hi,
I can use it to test in the same machine, given, of course, you're accessing apache on the default port (otherwise you need to adjust the ports).
However, I think Mike has a GUI for this on his github. :)
Regards,
Miguel Arroz Hi fellow WOrriors,
Thought I'd share a tip that works on
Mac OS X to simulate a slow internet connection. Gives you a nice visceral
feel for how your app performs in the wild.
You need at least two simple scripts:
throttle_30kb.sh (simulates fast dialup
connection):
=======================
sudo ipfw pipe 1 config bw 30KByte/s
sudo ipfw add 1 pipe 1 src-port https
sudo ipfw pipe 2 config bw 30KByte/s
sudo ipfw add 2 pipe 2 dst-port https
throttle_stop.sh (removes speed dampening):
=======================
sudo ipfw flush
In my testing I have a couple of different
throttle speed scripts:
15kb -> fast fax speed
30kb -> fast modem speed
100kb -> ISDN speed
You need two computers to test this.
You wont see the speed decrease using a web browser on the same computer
as the webserver. I tried using the port that the WO instance was running
on instead of "https" in the script. That "worked"
and didn't need another computer but you run the risk of getting the "application
not available" message that way. Additionally if you connect to your
app without a secure socket use "http" instead of "https"
in the script.
You can learn more about this tool on
the Internet by googling:
"ipfw"
"traffic shaping"
I believe "ipfw" stands for
"internet protocol fire wall". It is part of the FreeBSD tools
and is quite powerful. You can specify not only bandwidth caps but also
"latency". You can also prioritize traffic.
Here are a few URLs that were useful
- there may be better ones for more advanced topics:
http://blog.aptivate.org/2010/01/23/make-sure-your-apps-work-in-the-field/
http://www.afp548.com/article.php?story=20060214081244545&mode=print
http://cs.baylor.edu/~donahoo/tools/dummy/tutorial.htm
|
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