60 lines
1.9 KiB
Plaintext
60 lines
1.9 KiB
Plaintext
import hilog from '@ohos.hilog';
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import file from '@ohos.file.fs'
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export class CpuUsageMonitor {
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private static readonly TAG: string = 'CpuUsageMonitor';
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// 读取/proc/stat文件的第一行，获取CPU的总时间信息
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private static getCpuUsage(): number[] {
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let cpuTimes: number[] = [];
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try {
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let result = file.openSync('/proc/stat', file.OpenMode.READ_ONLY);
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let buffer = new ArrayBuffer(1024);
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let len = file.readSync(result.fd, buffer, { offset: 0 });
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let content = String.fromCharCode.apply(null, new Uint8Array(buffer, 0, len));
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file.closeSync(result.fd);
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let lines = content.split('\n');
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if (lines.length > 0 && lines[0].startsWith('cpu ')) {
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let parts = lines[0].split(/\s+/);
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for (let i = 1; i <= 7; i++) {
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cpuTimes.push(parseInt(parts[i]));
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}
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}
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} catch (err) {
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hilog.error(0x0000, this.TAG, `Failed to read /proc/stat: ${err.message}`);
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}
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return cpuTimes;
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}
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// 计算CPU使用率
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private static calculateCpuUsage(prevCpuTimes: number[], currCpuTimes: number[]): number {
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let prevIdle = prevCpuTimes[3] + prevCpuTimes[4]; // idle + iowait
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let currIdle = currCpuTimes[3] + currCpuTimes[4]; // idle + iowait
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let prevTotal = prevCpuTimes.reduce((a, b) => a + b, 0);
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let currTotal = currCpuTimes.reduce((a, b) => a + b, 0);
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let totalDiff = currTotal - prevTotal;
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let idleDiff = currIdle - prevIdle;
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if (totalDiff === 0) {
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return 0;
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}
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return 100 * (totalDiff - idleDiff) / totalDiff;
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}
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public static printCpuUsage(): void {
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setInterval(() => {
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let prevCpuTimes = this.getCpuUsage();
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setTimeout(() => {
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let currCpuTimes = this.getCpuUsage();
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let cpuUsage = this.calculateCpuUsage(prevCpuTimes, currCpuTimes);
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hilog.info(0x0000, this.TAG, `Current CPU Usage: ${cpuUsage.toFixed(2)}%`);
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}, 1000); // 等待1秒
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}, 5000)
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}
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}
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