On Sat, Oct 17, 2009 at 11:26:04PM +0530, Viji V Nair wrote: > these files are not in a single directory, this is a pyramid > structure. There are total 15 pyramids and coming down from top to > bottom the sub directories and files are multiplied by a factor of 4. > > The IO is scattered all over!!!! and this is a single disk file system. > > Since the python application is creating files, it is creating > multiple files to multiple sub directories at a time. What is the application trying to do, at a high level? Sometimes it's not possible to optimize a filesystem against a badly designed application. :-( It sounds like it is generating files distributed in subdirectories in a completely random order. How are the files going to be read afterwards? In the order they were created, or some other order different from the order in which they were read? With a sufficiently bad access patterns, there may not be a lot you can do, other than (a) throw hardware at the problem, or (b) fix or redesign the application to be more intelligent (if possible). - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
