使用OSHI库精确测量Java中的磁盘活动时间与传输速率

import oshi.SystemInfo;
import oshi.hardware.HWDiskStore;
import oshi.util.Util;

public class DiskActivityMonitor {

    public static void main(String[] args) {
        SystemInfo si = new SystemInfo();
        // 获取第一个磁盘存储设备，您可以根据需要遍历所有磁盘
        HWDiskStore disk = si.getHardware().getDiskStores().get(0);

        // 第一次快照
        long initialReads = disk.getReads();
        long initialWrites = disk.getWrites();
        long initialTransferTime = disk.getTransferTime();
        long initialTimestamp = disk.getTimeStamp();

        System.out.format("第一次快照: Reads: %d, Writes: %d, XferTime: %d ms, Timestamp: %d%n",
                initialReads, initialWrites, initialTransferTime, initialTimestamp);

        // 模拟一段时间的间隔，例如10秒
        Util.sleep(10000); // 暂停10秒

        // 更新磁盘属性以获取第二次快照
        disk.updateAttributes();

        // 第二次快照
        long finalReads = disk.getReads();
        long finalWrites = disk.getWrites();
        long finalTransferTime = disk.getTransferTime();
        long finalTimestamp = disk.getTimeStamp();

        System.out.format("第二次快照: Reads: %d, Writes: %d, XferTime: %d ms, Timestamp: %d%n",
                finalReads, finalWrites, finalTransferTime, finalTimestamp);

        // 计算时间间隔内的变化量
        long elapsedMillis = finalTimestamp - initialTimestamp;
        long deltaReads = finalReads - initialReads;
        long deltaWrites = finalWrites - initialWrites;
        long deltaTransferTime = finalTransferTime - initialTransferTime;

        System.out.println("\n--- 计算结果 ---");
        System.out.format("实际经过时间: %d 毫秒%n", elapsedMillis);
        System.out.format("期间读取操作数: %d%n", deltaReads);
        System.out.format("期间写入操作数: %d%n", deltaWrites);
        System.out.format("期间磁盘活跃时间: %d 毫秒%n", deltaTransferTime);

        // 计算磁盘活跃时间百分比
        if (elapsedMillis > 0) {
            double activePercentage = (double) deltaTransferTime / elapsedMillis * 100;
            System.out.format("磁盘活跃时间百分比: %.2f%%%n", activePercentage);
        } else {
            System.out.println("时间间隔过短，无法计算活跃时间百分比。");
        }

        // 计算每秒传输次数
        if (deltaTransferTime > 0) {
            long totalTransfers = deltaReads + deltaWrites;
            double transfersPerMillis = (double) totalTransfers / deltaTransferTime;
            double transfersPerSecond = transfersPerMillis * 1000;
            System.out.format("每秒传输次数: %.2f 次/秒%n", transfersPerSecond);
        } else {
            System.out.println("期间无数据传输，无法计算每秒传输次数。");
        }
    }
}

第一次快照: Reads: 70472443, Writes: 62744300, XferTime: 30886365 ms, Timestamp: 1667953835809
第二次快照: Reads: 70476812, Writes: 62744787, XferTime: 30887206 ms, Timestamp: 1667953845847

--- 计算结果 ---
实际经过时间: 10038 毫秒
期间读取操作数: 4369
期间写入操作数: 487
期间磁盘活跃时间: 841 毫秒
磁盘活跃时间百分比: 8.38%
每秒传输次数: 5774.08 次/秒