[Lustre-discuss] mpi-io support

[Weikuan Yu]

Andreas Dilger wrote:
> 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.
> 

In addition, the one integrated into MPICH2-1.0.7 contains direct I/O 
support. Lockless I/O support was purged out due into my lack of 
confidence in low-level file system support. But it can be revived when 
possible.

-- 
Weikuan Yu <+> 1-865-574-7990
http://ft.ornl.gov/~wyu/