On Saturday 30 June 2007 02:04, Jeff Johnson <n3npq@mac.com> wrote:
> Should I add O_SYNC when opening files on delayed write file systems?
> Doable, but annoying mapping the path back to a file system type to  
> infer functionality.

O_SYNC is not the correct solution.  XFS likes to delay block allocation to 
get contiguous files.  O_SYNC on XFS would either result in re-allocating 
file blocks (terrible for write performance) or discontigous files.  Write 
performance will always be expected to be better from a fsync() before 
close() than from O_SYNC.

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