|
|
|
@ -9,6 +9,31 @@ A sample application that demonstrate best practices when using [`isolates`](htt
|
|
|
|
|
* Demonstrate how to initialize and use an isolate.
|
|
|
|
|
* Show the cost of moving data between isolates and provide alternatives.
|
|
|
|
|
|
|
|
|
|
## The important bits
|
|
|
|
|
|
|
|
|
|
### `page_one.dart`
|
|
|
|
|
|
|
|
|
|
Compares running a large computation on the main isolate with running the same calculation
|
|
|
|
|
on a second isolate. When the main isolate is used, Flutter is unable to render new frames, and
|
|
|
|
|
the `SmoothAnimationWidget`'s animation freezes.
|
|
|
|
|
### `page_two.dart`
|
|
|
|
|
|
|
|
|
|
Creates an isolate used to run an infinite loop that sums batches of 100M randomly generated
|
|
|
|
|
numbers at a time. Users can start, terminate, pause, and resume the isolate, as well as modify
|
|
|
|
|
how the calculation is performed.
|
|
|
|
|
|
|
|
|
|
### `page_three.dart`
|
|
|
|
|
|
|
|
|
|
Demonstrates how expensive it is to move large amounts of data between isolates and a
|
|
|
|
|
better alternative to move data. This page creates an isolate that can add up a list of numbers
|
|
|
|
|
and gives users three options for how to provide it with input:
|
|
|
|
|
|
|
|
|
|
* Send values normally using a List
|
|
|
|
|
* Send the values using TransferableTypedData
|
|
|
|
|
* Generate the values on the second isolate, so no copying is necessary
|
|
|
|
|
|
|
|
|
|
Users can then compare the performance of each approach using the displayed timestamps.
|
|
|
|
|
|
|
|
|
|
## Questions/issues
|
|
|
|
|
|
|
|
|
|
If you have a general question about any of the techniques you see in
|
|
|
|
@ -19,4 +44,4 @@ the sample, the best places to go are:
|
|
|
|
|
* [StackOverflow](https://stackoverflow.com/questions/tagged/flutter)
|
|
|
|
|
|
|
|
|
|
If you run into an issue with the sample itself, please file an issue
|
|
|
|
|
in the [main Flutter repo](https://github.com/flutter/flutter/issues).
|
|
|
|
|
in the [main Flutter repo](https://github.com/flutter/flutter/issues).
|
|
|
|
|