On Mon, Jul 05, 2010 at 05:27:44PM +0300, Andrei Deftu wrote: > Hi, > > As many people have pointed out, xfs is very slow when deleting a > large number of files. Does anyone has a technical answer to this > problem? Also, I am interested to know if there is a way to > temporarily speed up the delete process, regardless of all the other > parameters. The technical reason is to do with the architecture of the transaction and logging subsystem of XFS. The key concept: relogging of dirty objects. The reason it affects unlinks: removing files from the same directory modifies the same objects repeatedly (e.g. the directory btree blocks). For a detailed explanation of the concept and how delayed logging takes advantage of it to speed up stuff like deleting a large number of files, see: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=Documentation/filesystems/xfs-delayed-logging-design.txt Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
