is thee anyway to pre-alloc space for a dir that is going to get a bunch of long filenames? (+ frag scripts)

[Linda Walsh]

Dave Chinner wrote:
> On Tue, Jan 15, 2013 at 10:03:50PM -0800, Linda Walsh wrote:
>> Was doing some createrepo ops with about 3k rpms and it created a
>> cachedir w/~10k LONG entries .. size of the dir was(is) 348k,
>> did a frag count on it and it had 155 fragments.  Ouch.
>>
>> Anyway to pre-alloc a dir or some means get a dir w/fewer frags...
> 
> No.
> 
>> Mostly curiosity -- though I'd fix it if there was an easy fix -- but
>> it's not a dir that's going to get much access, so it doesn't matter
>> alot.
> 
> Just because the directory has lots of extents, it doesn't
> mean it is fragmented. Indeed, the directory read order may be a
> different order to the order of extents, especially as tehre are
> multiple trees/indexes in the directory structure that are used
> depending on the type of access. So unless you have a performance
> problem, there is nothing to "fix". And if you do have a perf
> problem with large directories, then use a larger directory block
> size....
----
Thanks!...it's not a problem, just my anal retentiveness! ;-)