Performance running emulators

[Airton LUCIANO Aragão]

Hi.

I tried to use Firebase local emulators with functions running at nodejs and Flutter at Android Studio but it was impracticable because of terrible performance.

Is there any alternative or technique to avoid this? 

Thanks

[Sam Stern]

Hi Airton,

Can you explain a little more about what the performance problem is?  If your computer is feeling generally sluggish you may want to try using VSCode to develop Flutter apps rather than Android Studio, it's *much* less resource intensive. Another thing you can do is use a real Android device instead of an emulator, which takes some load away from your computer.

Unfortunately I can't offer any performance tips on how to make the emulators perform better, the Functions emulator uses a swarm of lightweight Node processes which can't be slimmed down much further.

- Sam

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[Airton LUCIANO Aragão]

Hi Sam.

Thanks a lot for guiding me...

I tried with a Smartphone and things appear to be really better. Input data at the real device seems to be normal. At the device emulator  it's terrible.

The problem now is that there is a message about  connect failed with ip 10.0.2.2 8080. I am using the same configuration that I used with the virtual device.

May you help me with this? 

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[Sam Stern]

Ah yes I should have thought of that before, sorry! So "10.0.2.2" is a special IP address you can use in emulators which says 'let me access the localhost of the host computer'.

When running on a real device you need to do a few things:

1 - Make sure the devices are on the same WiFi network

They'll need to be able to talk to each other over the local network

2 - Determine the local IP address of the computer running the emulators

Follow steps like these to get your local IP address

3 - Change the firebase.json file to use the new host when you start the emulators

So let's say your local IP is 192.168.1.7 you can do this in your firebase.json

{
  "emulators": {

    "functions": {

        "host": "192.168.1.7",

        "port": 5001

     }

}

4 - Update your Android code

Finally wherever you're calling useEmulator() make sure to pass "192.168.1.7" (or whatever your real IP is) where you previously passed "10.0.2.2"

- Sam

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[Airton LUCIANO Aragão]

Hi.

I followed everything but it continues not working. I am a little bit confused about which internal IP to choose. Is it that used at wifi network ?

Please, note at this error message that there is something strange following the "from" word.

cause=java.net.ConnectException: failed to connect to /127.0.1.1 (port 8080) from /:: (port 45605):

Thanks

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       Airton LUCIANO Aragão

[Airton LUCIANO Aragão]

Hi Sam

I used the "real" ip address and everything worked like a charm rsrsrsrs.

Thanks a lot !!!!!! 

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       Airton LUCIANO Aragão

[Sam Stern]

That's great news thanks for following up!

- Sam

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