用VB.NET测试硬盘速度

VB.NET测试硬盘速度
转贴来自于HSC梦想的天空的blog

       前日在用SiSoftware Sandra 2004测试硬盘性能时突发其想,用自己熟悉的VB.NET测试行不行呢?具体怎么做呢?

我们最感兴趣的是硬盘在最大负荷下持续的读取和写入速度。为了能够比较准确的测出平均速度,我决定采用先写入一个1GB的文件再读取出来的办法。考虑到不要让更多的任务花在循环上,我首先建立起一个足够大的缓冲区,然后往磁盘写入这个缓冲的内容,从而使硬盘达到最大的负荷。考虑到Windows的读取机制,硬盘测试不太准确,此程序的读取部分只能在第一次运行时使用,运行次数越多测试也不准确,而写入测试多次运行以后依然能够保持准确性。现在就开始动手。

VB.NET中创建了一个控制台工程TestHarddisk,然后在Sub Main中写入下列程序。

    Sub Main()

        Dim I As Int32

        Dim f As New FileStream("E:/BigFile.big", FileMode.Create)

        Dim fw As New BinaryWriter(f)

        Dim fr As New BinaryReader(f)

        Dim Size As Int32 = 1024 * 1024 * 1024 - 1  'File size = 1GB

        Dim bufSize As Int32 = 30 * 1024 * 1024     'Buffer Size = 30MB

        Dim jLast As Int32 = bufSize - 1

        Dim j As Int32

        Dim Bytes(bufSize) As Byte

        Dim StartWrite As Date = Date.Now

 

        Console.WriteLine("Write Start at {0}", StartWrite)

        Console.WriteLine("Creating...")

 

        For I = 0 To Size Step bufSize '1GB

            fw.Write(Bytes)

        Next

 

        Dim EndWrite As Date = Date.Now

        Dim TimePassed As TimeSpan = EndWrite.Subtract(StartWrite)

 

        Console.WriteLine("Write End at {0}", EndWrite)

        Console.WriteLine("Time passed:{0}", TimePassed)

        Console.WriteLine("Speed:{0}", 1000 / TimePassed.TotalSeconds)

 

        fw.Flush()

        Dim StartRead As Date = Date.Now

        Console.WriteLine("Read Start at {0}", StartRead)

        Console.WriteLine("Reading")

 

        For I = 0 To Size Step bufSize

            Bytes = fr.ReadBytes(bufSize)

        Next

 

        Dim EndRead As Date = Date.Now

        TimePassed = EndRead.Subtract(StartRead)

 

        Console.WriteLine("Read End at {0}", EndRead)

        Console.WriteLine("Time passed:{0}", TimePassed)

        Console.WriteLine("Read speed:{0}", 1000 / TimePassed.TotalSeconds)

        Console.ReadLine()

 

        fw.Close()

    End Sub

现在测试。

硬件配置:

Athlon 2500+running at 1.8G

EPOX 8RDA3+ nForce2主板

512DDR 400(running at 400MHz)

ATA100 Seagate 7200.7 80GB 2MB

软件配置:

Windows 2003 Server Standard Edition

全套最新的WHQL驱动程序

Visual Studio 2003,编译选择Realse模式,打开所有优化选项。

第一次运行测试得写入速度43MB/s,第二次测得42MB/s,第三次41MB/sSisoftware测试得的结果43MB/s相差不大,达到了理想的效果。然而读取测试就变态了,第一次64MB/s,与Sissoftware测试多了5MB/s左右,第二次达到了1096MB/s,第三次1123MB/s,这和Windows的磁盘缓冲机制有关,看来作用还是蛮大的,当然,建议读取测试在重起电脑以后进行。

欢迎与我探讨,我的主页:http://hesicong2004.vip.myrice.com

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