Performance tool

[andy steven]

hi i want a performance tool that just does reads and writes to disk, this is so i can see whether performance degrades over time.

anyone know of a good free tool

[B. Hulst]

Hi,

You can use dd.

and monitor it with sar (or glance).

Or use

times dd if=/tmp/1gb.data of=/var/tmp/test.dat


Regards,
Bob

[Andrei Lica_1]

see http://www.textuality.com/bonnie/
It's widely used for I/O speed benchmarks in both unix and linux. It has linear or random reads/writes, buffered and unbuffered, seek tests.
Sometimes dd ( depending on unix flavour or fielsystem type/block size ) is not performing very well.

[Leif Halvarsson_2]

Hi,
Another usefull benchmark tool is PostMark from NetApp.
http://www.netapp.com/tech_library/3022.html

[MAUCCI_2]

You want to give a try to iozone (http://www.iozone.org/) too