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  Simulating Lag  (Read 2153 times)
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Offline Jacob_

Junior Devvie

Projects: 3

« Posted 2010-09-29 20:29:16 »

This isn't specific to Java, but is there a way to create network lag on localhost or in a LAN for testing purposes? Router, OS, or application settings would be OK.
Offline teletubo
Global Moderator

JGO Wizard

Medals: 67
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« Reply #1 - Posted 2010-09-29 20:43:00 »

you can simply put a call to Thread.sleep(randomButNotmuch);  before sending a response from the server . That's how I do it .

Offline Orangy Tang

JGO Kernel

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Monkey for a head

« Reply #2 - Posted 2010-09-29 20:53:45 »

NIST is specifically designed for this kind of thing, and does it pretty damn well. Does require you to set up a linux box to route your traffic through though.

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Offline Riven
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Hand over your head.

« Reply #3 - Posted 2010-09-30 10:55:02 »

Override all and OutputStream.write(...) methods, and sleep once every N bytes.

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Offline dbotha

Senior Newbie

« Reply #4 - Posted 2010-10-01 07:47:43 »

If you are on linux take a look at the 'tc' (traffic control) command, I use it for this sort of thing all the time.
For example to add 100ms delay, 50ms jitter and 1% loss to the eth0 interface you would do the following:

tc qdisc add dev eth0 root netem delay 100ms 50ms loss 1%

And to remove:

tc qdisc del dev eth0 root netem

As an alternative to NIST you may also want to check out Dummynet. Their homepage indicates that it now supports all the major platforms.
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