[Lustre-discuss] mpi-io support

Andreas Dilger adilger at sun.com
Wed Mar 12 02:11:35 PDT 2008


On Mar 11, 2008  16:10 -0600, Marty Barnaby wrote:
> I'm not actually sure what ROMIO abstract device the multiple CFS 
> deployments I utilize were defined with. Probably just UFS, or maybe NFS. 
> Did you have a recommended option yourself.

The UFS driver is the one used for Lustre if no other one exists.

> Besides the fact that most of the adio that were created over the years are 
> completely obsolete and could be cleaned from ROMIO, what will the new one 
> for Lustre offer? Particularly with respect to controls via the lfs utility 
> that I can  already get?

There is improved collective IO that aligns the IO on Lustre stripe
boundaries.  Also the hints given to the MPIIO layer (before open,
not after) result in lustre picking a better stripe count/size.

> Marty Barnaby
>
> Weikuan Yu wrote:
>> Robert Latham wrote:
>>   
>>> On Mon, Jan 14, 2008 at 02:43:49PM -0500, Weikuan Yu wrote:
>>>     
>>>> Andreas Dilger wrote:
>>>>       
>>>>> Weikuan,
>>>>> has this updated version been submitted to MPICH2 yet?  Is there any reason
>>>>> NOT to submit it to the upstream MPICH2 maintainers so all users get the
>>>>> benefit of this work?
>>>>>
>>>>>         
>>>> Yes, indeed it has been submitted to MPICH2 maintainers. It is my hope
>>>> that it would be incorporated into the upcoming release of MPICH2 soon.
>>>>
>>>> Robert L., could you comment here? I will try to provide info as needed.
>>>>       
>>> I added the bulk of Weikuan's ad_lustre driver to ROMIO a few weeks
>>> ago.  It will be in the upcomming MPICH2-1.0.7 release.
>>>
>>> Thanks for the contribution!
>>>
>>>     
>>
>> Great! Thanks for making this happen, Rob!
>>
>> --
>> Weikuan Yu <+> 1-865-574-7990
>> http://ft.ornl.gov/~wyu/
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>>
>>   
>

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Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.




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