[文本处理] 求助批处理读写外设速率（USB&SD）时间相减报错

dragon123

测试USB和SD卡的速率，由于用crystalDiskMark图形界面需要鼠标去操作，有没有不需要图形界面直接运行可以读取USB和SD速率，可以读写到速率，可以比对预设值，达到反馈1
wmic和powershell可以实现吗

dragon123

@echo off
setlocal enabledelayedexpansion

rem 设置 USB 设备的盘符，需要根据实际情况修改
set "usbDrive=F:"

rem 设置测试文件的大小（单位：MB）
set "testFileSize=100"

rem 设置测试文件的名称
set "testFileName=testfile.dat"

rem 生成测试文件
echo Generating test file...
fsutil file createnew %testFileName% %testFileSize%000000

rem 写入测试
echo Starting write test...
for /f "usebackq delims=" %%a in (`powershell -command "[Math]::Round((Get-Date).ToFileTimeUtc() / 10000, 0)"`) do set "startTime=%%a"
robocopy . %usbDrive% %testFileName% /njh /njs
for /f "usebackq delims=" %%a in (`powershell -command "[Math]::Round((Get-Date).ToFileTimeUtc() / 10000, 0)"`) do set "endTime=%%a"

set /a writeTime=endTime - startTime
if !writeTime! equ 0 (
    echo Write operation was too fast to measure accurately.
) else (
    set /a writeRate=(%testFileSize% * 1000 * 1000) / writeTime
    echo Write rate: !writeRate! KB/s
)

rem 读取测试
echo Starting read test...
for /f "usebackq delims=" %%a in (`powershell -command "[Math]::Round((Get-Date).ToFileTimeUtc() / 10000, 0)"`) do set "startTime=%%a"
robocopy %usbDrive% . %testFileName% /njh /njs
for /f "usebackq delims=" %%a in (`powershell -command "[Math]::Round((Get-Date).ToFileTimeUtc() / 10000, 0)"`) do set "endTime=%%a"

set /a readTime=endTime - startTime
if !readTime! equ 0 (
    echo Read operation was too fast to measure accurately.
) else (
    set /a readRate=(%testFileSize% * 1000 * 1000) / readTime
    echo Read rate: !readRate! KB/s
)

rem 清理测试文件
del %testFileName%
del %usbDrive%\%testFileName%

echo Test completed.
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用豆包自动生成了一个bat,但是运行到计算时间的时候报错，就是下面这段

set /a writeTime=endTime - startTime
if !writeTime! equ 0 (
    echo Write operation was too fast to measure accurately.
) else (
    set /a writeRate=(%testFileSize% * 1000 * 1000) / writeTime
    echo Write rate: !writeRate! KB/s
)
复制代码

大佬帮我看看哪里错了

aloha20200628

回复 2# dragon123

这是因为批处有大数运算限制，只能处理整数，且整数最大值是 2147483647。

set /a writeTime=endTime - startTime 改为如下行

for /f %%v in ('powershell "!endTime!-!startTime!" ') do set "writeTime=%%v"
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set /a writeRate=(%testFileSize% * 1000 * 1000) / writeTime 改为如下行

for /f %%v in ('powershell "(!testFileSize!*1000*1000)/!writeTime!" ') do set "writeRate=%%v"
复制代码

读取测试中的 set /a readTime=... 和 set /a readRate=... 相关行也要参照以上句式同法置换...

dragon123

回复 3# aloha20200628


    感谢，我试试

77七

robocopy的操作日志中有速度一项，是否可以不用另外计算时间了呢。另外不懂就问，这种方式科学吗...