java - 如何在 Java 中测量磁盘速度以进行基准测试

Question

我想知道如何使用 Java API 测量磁盘速度。

随机读、顺序读和随机顺序写。

如果有人认为这不是一个真正的问题。请在关闭前说明。

谢谢

Answer 1

你可以看看我用 java 写的一个磁盘工具。它可能不是特别花哨，但它确实有效。

https://sourceforge.net/projects/jdiskmark/

这是编写测量代码的片段:

try (RandomAccessFile rAccFile = new RandomAccessFile(testFile,mode)) {
    for (int b=0; b<numOfBlocks; b++) {
        if (App.randomEnable) {
            int rLoc = Util.randInt(0, numOfBlocks-1);
            rAccFile.seek(rLoc*blockSize);
        } else {
            rAccFile.seek(b*blockSize);
        }
        rAccFile.write(blockArr, 0, blockSize);
        totalBytesWrittenInMark += blockSize;
        wUnitsComplete++;
        unitsComplete = rUnitsComplete + wUnitsComplete;
        percentComplete = (float)unitsComplete/(float)unitsTotal * 100f;
    }
}
long endTime = System.nanoTime();
long elapsedTimeNs = endTime - startTime;
double sec = (double)elapsedTimeNs / (double)1000000000;
double mbWritten = (double)totalBytesWrittenInMark / (double)MEGABYTE;
long bwMbSec = mbWritten / sec;
System.out.println("Write IO is " + bwMbSec + " MB/s"
    + "(MB written " + mbWritten + " in " + sec + " sec)");

代码在gitlab上: https://gitlab.com/jamesmarkchan/jDiskMark/