| From: | Florian Weimer <fweimer(at)redhat(dot)com> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Bottlenecks with large number of relation segment files |
| Date: | 2013-08-05 11:38:41 |
| Message-ID: | 51FF8EC1.9050209@redhat.com |
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| Lists: | pgsql-general pgsql-hackers |
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.)
--
Florian Weimer / Red Hat Product Security Team
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