How to judge how long it takes to read and write files in the ls directory by the read and write speed of the hard disk?

my hard disk speed is as follows. How long will it take to have 10000 files in the ls directory

time dd bs=64k count=4k if=/dev/zero of=test oflag=dsync 
4096+0 
4096+0 
268435456(268 MB)32.583 8.2 MB/

real    0m32.584s
user    0m0.012s
sys    0m0.896s

Linux-operation-and-maintenance centos

Sep.16,2021

this also depends on whether other programs are reading the hard drive

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b34e60-2bf69.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b34e60-2bf69.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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