OSHI库实现磁盘活动时间与利用率监控及计算指南

import com.github.oshi.SystemInfo;
import com.github.oshi.hardware.HWDiskStore;
import com.github.oshi.util.Util; // OSHI提供的简单休眠工具

public class DiskActivityMonitor {

    public static void main(String[] args) {
        // 获取系统信息实例
        SystemInfo si = new SystemInfo();
        // 获取硬件信息
        // 假设我们只监控第一个磁盘，实际应用中可能需要遍历所有磁盘
        if (si.getHardware().getDiskStores().isEmpty()) {
            System.out.println("未找到任何磁盘存储设备。");
            return;
        }
        HWDiskStore disk = si.getHardware().getDiskStores().get(0);

        System.out.println("--- 初始磁盘状态快照 ---");
        long initialReads = disk.getReads();
        long initialWrites = disk.getWrites();
        long initialTransferTime = disk.getTransferTime();
        long initialTimeStamp = disk.getTimeStamp();
        System.out.format("Reads: %d, Writes: %d, XferTime: %d ms, Timestamp: %d%n",
                          initialReads, initialWrites, initialTransferTime, initialTimeStamp);

        // 模拟一段时间的系统运行
        int observationIntervalMs = 10000; // 10秒
        System.out.println("--- 等待 " + (observationIntervalMs / 1000) + " 秒 ---");
        Util.sleep(observationIntervalMs);

        // 更新磁盘属性以获取最新数据
        disk.updateAttributes();

        System.out.println("--- 10秒后磁盘状态快照 ---");
        long finalReads = disk.getReads();
        long finalWrites = disk.getWrites();
        long finalTransferTime = disk.getTransferTime();
        long finalTimeStamp = disk.getTimeStamp();
        System.out.format("Reads: %d, Writes: %d, XferTime: %d ms, Timestamp: %d%n",
                          finalReads, finalWrites, finalTransferTime, finalTimeStamp);

        // 计算增量
        long deltaReads = finalReads - initialReads;
        long deltaWrites = finalWrites - initialWrites;
        long deltaTransferTime = finalTransferTime - initialTransferTime; // 毫秒
        long deltaObservationTime = finalTimeStamp - initialTimeStamp;   // 毫秒

        System.out.println("\n--- 统计结果 ---");
        System.out.format("观测期间 (%d ms):%n", deltaObservationTime);
        System.out.format(" - 读取操作数增量: %d%n", deltaReads);
        System.out.format(" - 写入操作数增量: %d%n", deltaWrites);
        System.out.format(" - 传输时间增量: %d ms%n", deltaTransferTime);

        // 计算磁盘活跃时间百分比
        double activeTimePercentage = (double) deltaTransferTime / deltaObservationTime * 100;
        System.out.format(" - 磁盘活跃时间百分比: %.2f%%%n", activeTimePercentage);

        // 计算每秒传输次数
        // 避免除以零，如果deltaTransferTime为0，说明这段时间磁盘没有传输
        if (deltaTransferTime > 0) {
            double transfersPerMillisecond = (double) (deltaReads + deltaWrites) / deltaTransferTime;
            double transfersPerSecond = transfersPerMillisecond * 1000;
            System.out.format(" - 每秒传输次数 (平均活跃期间): %.2f 次/秒%n", transfersPerSecond);
        } else {
            System.out.println(" - 观测期间磁盘无数据传输。");
        }
    }
}

--- 初始磁盘状态快照 ---
Reads: 70472443, Writes: 62744300, XferTime: 30886365 ms, Timestamp: 1667953835809
--- 等待 10 秒 ---
--- 10秒后磁盘状态快照 ---
Reads: 70476812, Writes: 62744787, XferTime: 30887206 ms, Timestamp: 1667953845847

--- 统计结果 ---
观测期间 (10038 ms):
 - 读取操作数增量: 4369
 - 写入操作数增量: 487
 - 传输时间增量: 841 ms
 - 磁盘活跃时间百分比: 8.38%
 - 每秒传输次数 (平均活跃期间): 5774.08 次/秒