(2013/08/05 20:38), Florian Weimer wrote:
On 08/05/2013 10:42 AM, John R Pierce wrote:
On 8/5/2013 1:01 AM, KONDO Mitsumasa wrote:
When we open file, ext3 or ext4 file system seems to sequential search
inode for opening file in file directory.
no, ext3/4 uses H-tree structures to search directories over 1 block
long quite efficiently.
And the Linux dentry cache is rather aggressive, so most of the time, only the
in-memory hash table will be consulted. (The dentry cache only gets flushed on
severe memory pressure.)
Are you really? When I put large number of files in same directory and open,
it is very very slow. But open directory is not.
So I think it's only directory search. Not file search in same directory. And I
heard before it.
Regards,
--
Mitsumasa KONDO
NTT Open Source Software Center
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