@@ -17,11 +17,11 @@ hiTraceMeter provides APIs for system performance tracing. You can call the APIs
## Constraints
Due to the asynchronous I/O feature of JS, the hiTraceMeter module provides only asynchronous APIs.
-Due to the asynchronous I/O feature of JS, the hiTraceMeter module provides only asynchronous APIs.
## Available APIs
The performance tracing APIs are provided by the **hiTraceMeter** module. For details, see [API Reference](../reference/apis/js-apis-hitracemeter.md).
The performance tracing APIs are provided by the **hiTraceMeter** module. For details, see [API Reference](../reference/apis/js-apis-hitracemeter.md).
**APIs for performance tracing**
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@@ -35,114 +35,120 @@ The performance tracing APIs are provided by the **hiTraceMeter** module. For de
In this example, distributed call chain tracing begins when the application startup execution page is loaded and stops when the service usage is completed.
1. Create a JS application project. In the displayed **Project** window, choose **entry** > **src** > **main** > **js** > **default** > **pages** > **index**, and double-click **index.js**. Add the code to implement performance tracing upon page loading. The sample code is as follows:
```js
importhiTraceMeterfrom'@ohos.hiTraceMeter'
exportdefault{
data:{
title:""
},
onInit(){
this.title=this.$t('strings.world');
// Start trace tasks with the same name concurrently.
hiTraceMeter.startTrace("business",1);
// Keep the service process running.
console.log(`business running`);
hiTraceMeter.startTrace("business",2);// Start the second trace task with the same name while the first task is still running. The tasks are running concurrently and therefore their taskId must be different.
// Keep the service process running.
console.log(`business running`);
hiTraceMeter.finishTrace("business",1);
// Keep the service process running.
console.log(`business running`);
hiTraceMeter.finishTrace("business",2);
// Start trace tasks with the same name in serial mode.
hiTraceMeter.startTrace("business",1);
// Keep the service process running.
console.log(`business running`);
hiTraceMeter.finishTrace("business",1);// End the first trace task.
// Keep the service process running.
console.log(`business running`);
hiTraceMeter.startTrace("business",1);// Start the second trace task with the same name in serial mode.
2. Create an ArkTs application project. In the displayed **Project** window, choose **entry** > **src** > **main** > **ets** > **pages** > **index**, and double-click **index.js**. Add the code to implement performance tracing upon page loading. For example, if the name of the trace task is **HITRACE\_TAG\_APP**, the sample code is as follows:
```ts
importhitracefrom'@ohos.hiTraceMeter';
@Entry
@Component
structIndex{
@Statemessage:string='Hello World';
1. Create a project, and call hiTraceMeter APIs in the service logic to implement performance tracing.
build(){
Row(){
Column(){
Text(this.message)
.fontSize(50)
.fontWeight(FontWeight.Bold)
.onClick(()=>{
this.message='Hello ArkUI';
// Start trace tasks with the same name concurrently.
hitrace.startTrace("HITRACE_TAG_APP",1001);
// Keep the service process running.
console.log(`HITRACE_TAG_APP running`);
// Start the second trace task with the same name while the first task is still running. The tasks are running concurrently and therefore their taskId must be different.
hitrace.startTrace("HITRACE_TAG_APP",1002);
// Keep the service process running.
console.log(`HITRACE_TAG_APP running`);
hitrace.finishTrace("HITRACE_TAG_APP",1001);
hitrace.finishTrace("HITRACE_TAG_APP",1002);
// If trace tasks with the same name are not run concurrently, the same taskId can be used.
hitrace.startTrace("HITRACE_TAG_APP",1003);
// Keep the service process running.
console.log(`HITRACE_TAG_APP running`);
// End the first trace task.
hitrace.finishTrace("HITRACE_TAG_APP",1003);
// Start the second trace task with the same name in serial mode. It uses a taskId different from the first trace task.
hitrace.startTrace("HITRACE_TAG_APP",1004);
// Keep the service process running.
console.log(`HITRACE_TAG_APP running`);
lettraceCount=3;
hitrace.traceByValue("myTestCount",traceCount);
hitrace.finishTrace("HITRACE_TAG_APP",1004);
// Start the third trace task with the same name in serial mode. It uses a taskId same as the second trace task.
hitrace.startTrace("HITRACE_TAG_APP",1004);
// Keep the service process running.
console.log(`HITRACE_TAG_APP running`);
// End the third trace task.
hitrace.finishTrace("HITRACE_TAG_APP",1004);
})
-**ArkTS application project**
Create an ArkTS application project. In the displayed **Project** window, choose **entry** > **src** > **main** > **ets** > **pages** > **index**, and double-click **index.js**. Add the code to implement performance tracing upon page loading. For example, if the name of the trace task is **HITRACE\_TAG\_APP**, the sample code is as follows:
```ts
import hitrace from '@ohos.hiTraceMeter';
@Entry
@Component
struct Index {
@State message: string = 'Hello World';
build() {
Row() {
Column() {
Text(this.message)
.fontSize(50)
.fontWeight(FontWeight.Bold)
.onClick(() => {
this.message = 'Hello ArkUI';
// Start trace tasks with the same name concurrently.
hitrace.startTrace("HITRACE_TAG_APP", 1001);
// Keep the service process running.
console.log(`HITRACE_TAG_APP running`);
// Start the second trace task with the same name while the first task is still running. The tasks are running concurrently and therefore their taskId must be different.
hitrace.startTrace("HITRACE_TAG_APP", 1002);
// Keep the service process running.
console.log(`HITRACE_TAG_APP running`);
hitrace.finishTrace("HITRACE_TAG_APP", 1001);
hitrace.finishTrace("HITRACE_TAG_APP", 1002);
// If trace tasks with the same name are not run concurrently, the same taskId can be used.
hitrace.startTrace("HITRACE_TAG_APP", 1003);
// Keep the service process running.
console.log(`HITRACE_TAG_APP running`);
// End the first trace task.
hitrace.finishTrace("HITRACE_TAG_APP", 1003);
// Start the second trace task with the same name in serial mode. It uses a taskId different from the first trace task.
hitrace.startTrace("HITRACE_TAG_APP", 1004);
// Keep the service process running.
console.log(`HITRACE_TAG_APP running`);
let traceCount = 3;
hitrace.traceByValue("myTestCount", traceCount);
hitrace.finishTrace("HITRACE_TAG_APP", 1004);
// Start the third trace task with the same name in serial mode. It uses a taskId same as the second trace task.
hitrace.startTrace("HITRACE_TAG_APP", 1004);
// Keep the service process running.
console.log(`HITRACE_TAG_APP running`);
// End the third trace task.
hitrace.finishTrace("HITRACE_TAG_APP", 1004);
})
}
.width('100%')
}
.height('100%')
}
.width('100%')
}
.height('100%')
}
}
```
3. Click the run button on the application page. Then, run the following commands in sequence in shell:
```
-**JS application project**
Create a JS application project. In the displayed **Project** window, choose **entry** > **src** > **main** > **js** > **default** > **pages** > **index**, and double-click **index.js**. Add the code to implement performance tracing upon page loading. The sample code is as follows:
```js
import hiTraceMeter from '@ohos.hiTraceMeter'
export default {
data: {
title: ""
},
onInit() {
this.title = this.$t('strings.world');
// Start trace tasks with the same name concurrently.
hiTraceMeter.startTrace("business", 1);
// Keep the service process running.
console.log(`business running`);
hiTraceMeter.startTrace("business", 2); // Start the second trace task with the same name while the first task is still running. The tasks are running concurrently and therefore their taskId must be different.
// Keep the service process running.
console.log(`business running`);
hiTraceMeter.finishTrace("business", 1);
// Keep the service process running.
console.log(`business running`);
hiTraceMeter.finishTrace("business", 2);
// Start trace tasks with the same name in serial mode.
hiTraceMeter.startTrace("business", 1);
// Keep the service process running.
console.log(`business running`);
hiTraceMeter.finishTrace("business", 1); // End the first trace task.
// Keep the service process running.
console.log(`business running`);
hiTraceMeter.startTrace("business", 1); // Start the second trace task with the same name in serial mode.
