disktest

a quick and dirty multithreaded read/write seek test

This tool works only with gcc/Linux.

The test reads or writes small random data (default 4KB) to block aligned seeks of a specified file or device.

usage: disktest [options] [-rwRWt] <device or file>
        -b [bytes]      block size (default 4K)
        -o [bytes]      offset into block (default 0)
        -s [bytes]      size to read/write (default 4K)
        -r [threads]    num read threads
        -w [threads]    num write threads
        -R [count]      total number of reads to do (across all threads)
        -W [count]      total number of writes to do (across all threads)
        -t [seconds]    time to run
        -S [bytes]      seek range limit (default is the size of the file/device)
        -d              debug on
        -D              use O_DIRECT (bypass page cache)
        -h              help

To test a file system, create a large file first. e.g. for 500 GB:

dd if=/dev/zero of=/data/mytestfile bs=4096 count=131072000

Examples:

Read seek test with 32 threads, running for 30 seconds, bypass page cache:

disktest -r 32 -t 30 -D /data/mytestfile

Do 8000 read seeks with 10 threads:

disktest -R 8000 -r 10 /data/mytestfile

Run 32 read threads and 1 write thread on the device (device data will be trashed!):

disktest -r 32 -w 1 -t 60 /dev/sdb

Seek within only the first 1 GB of the file/device

disktest -r 32 -S 1000000000 -t 30 /data/mytestfile

Authors:

• Steve Jiang (@sjiang) (email: gh at iamsteve.com)

License

disktest is licensed under the Apache License Version 2.0