[lustre-discuss] IOR input for pathologic file system abuse

Ben Evans bevans at cray.com
Tue Jun 13 07:41:22 PDT 2017

Not with dd or IOR, but one of the worst I've seen has been using named
pipes for inter-process communication.  That and doing 4 and 8 byte I/O's
using O_DIRECT.


On 6/12/17, 5:50 PM, "lustre-discuss on behalf of Cory Spitz"
<lustre-discuss-bounces at lists.lustre.org on behalf of spitzcor at cray.com>

>The worst case would probably involve reading/writing the same file
>extents across multiple nodes.  You could probably whip up a script using
>/bin/dd for such a thing.  Or is that too evil for you?
>On 6/2/17, 2:32 AM, "lustre-discuss on behalf of Michael Kluge"
><lustre-discuss-bounces at lists.lustre.org on behalf of
>michael.kluge at tu-dresden.de> wrote:
>    Hi all,
>    I am looking for IOR scripts that represent pathological use cases
>for file systems. Something like shared file access with a small,
>unaligned block size or random I/O to a shared file. Does anyone has some
>input for me there that he/she is willing to share?
>    Regards, Michael
>    -- 
>    Dr.-Ing. Michael Kluge
>    Technische Universität Dresden
>    Center for Information Services and
>    High Performance Computing (ZIH)
>    D-01062 Dresden
>    Germany
>    Contact:
>    Falkenbrunnen, Room 240
>    Phone:  (+49) 351 463-34217
>    Fax:    (+49) 351 463-37773
>    e-mail: michael.kluge at tu-dresden.de
>    WWW:    http://www.tu-dresden.de/zih
>lustre-discuss mailing list
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