Block Sizes

Joe Landman landman at
Thu Oct 31 13:11:39 PST 2002

Hi Leandro:

  I might suggest using XFS rather than ext2.  


On Thu, 2002-10-31 at 07:55, Leandro Tavares Carneiro wrote:
> Hi,
> 	I work here with an cluster beowulf running an "home-made" parallel 
> aplication, using MPI, and we have some problems of local disk IO.
> 	The aplication needs to load a lot of data information to process the real 
> data, and the development team don't know how to make the read more eficient. 
> They wanna change the block size when reading and writing, but they don't are 
> "IO experts", and they are having a lot of trouble with it.
> 	The application is writen in Fortran, and the development team sayd in  this 
> progamming language the change of block size is not possible, but they believe 
> be possible in C. Anyone have faced this kind of problem?
> 	This application runs also in an SGI machine with 32 cpus and the problem is 
> the same...
> 	If anyone have some tip to give to me, i will be very grateful!
> 	Regards,
> PS: Sorry about my poor english.
> -- 
> Leandro Tavares Carneiro
> Analista de Suporte
> Telefone: 2534-1427
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Joseph Landman, Ph.D
Scalable Informatics LLC,
email: landman at
web  :
phone: +1 734 612 4615

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