弱网测试原理与方法（二）-使用虚拟机模拟网络速率
通过虚拟机设置不同的网络速率，来测试不同网络类型下应用的反应。
虚拟机允许模拟各种网络传输比率，可以在虚拟机启动时设置传输比率范围。在虚拟机启动时设置网络速率，使用-netspeed选择项与<speed>值，使用-netdelay设置网络延迟的值。
命令如下：
emulator –avd avdName–port avdport –netspeed <speed> -netdelay <delay >
To make changes to network speed while the emulator isrunning, connect to the console and use the netspeed command with asupported <speed> value from the table below
更改网络速度在模拟器运行时,连接到控制台,使用netspeed命令支持从下表<速度值>
netspeed <speed> :上行/下载速率
|
|
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| Value |
Description |
Comments |
| gsm |
GSM/CSD |
(Up: 14.4, down: 14.4) |
| hscsd |
HSCSD |
(Up: 14.4, down: 43.2) |
| gprs |
GPRS |
(Up: 40.0, down: 80.0) |
| edge |
EDGE/EGPRS |
(Up: 118.4, down: 236.8) |
| umts |
UMTS/3G |
(Up: 128.0, down: 1920.0) |
| hsdpa |
HSDPA |
(Up: 348.0, down: 14400.0) |
| full |
no limit |
(Up: 0.0, down: 0.0) |
| <num> |
Set an exact rate used for both upload and download. |
|
| <up>:<down> |
Set exact rates for upload and download separately. |
|
To make changes to network delay while the emulator isrunning, connect to the console and use the netdelay command with asupported <delay> value from the table below.
更改网络延迟在模拟器运行时,连接到控制台,使用netdelay命令支持从下表<延迟>价值。
netdelay <delay>：延迟速度,单位为毫秒
| Value |
Description |
Comments |
| gprs |
GPRS |
(min 150, max 550) |
| edge |
EDGE/EGPRS |
(min 80, max 400) |
| umts |
UMTS/3G |
(min 35, max 200) |
| none |
No latency |
(min 0, max 0) |
| <num> |
Emulate an exact latency (milliseconds). |
|
| <min>:<max> |
Emulate an specified latency range (min, max milliseconds). |
|
命令如下：
emulator –avd avdName–port avdport –netspeed gsm -netdelay gprs
：该模拟器上传下载速率为gsm的值，延迟时间为gprs的值
可以写多条命令来对比不同速率传输应用程序的响应区别
数据来源于android官方网站