[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

Re: Disabling atime

Les Mikesell wrote:
> Benjamin Lewis wrote:
>>>>> There is something which leap out at me as soon a I saw this: the
>>>>> kind
>>>>> of person who _needs_ atime, knows how to set it. The majority of
>>>>> people
>>>>> - especially the home use - has little or no use for it whatsoever.
>>>> The majority of people will see a performance boost they will
>>>> appreciate regardless of whether they know about atime or not.
>>> But whether it is a noticeable difference or not will depend on the
>>> number of files they access, either with automated build procedures or
>>> GUI file managers that like to peek inside every file.  People who
>>> keep their directory trees sparse and don't venture out of their home
>>> directory in a GUI much will probably not know the difference except
>>> that tmpwatch may not clean up correctly and their mailer may have to
>>> do more work to decide if a message is unread (etc.).
>> In my experience, viewing a folder of images as thumbnails is
>> significantly slower with atime.
> Are you sure that your viewer didn't cache the thumbnail images on the
> first run so you were timing something different after changing the
> option?
I did clear the caches, yes.
>> Many users will be viewing folders of
>> images methinks. In addition, most GUIs read a large (read huge) number
>> of files when they load, so load times for the  GUI should be reduced
>> also.
> Some users will, some won't.  The atime change should be going though
> the disk write cache and thus only have a real-time hit when there is
> enough disk activity that the cache writes conflict with read operations.


Benjamin Lewis
Fedora Ambassador
ben lewis benl co uk

http://benl.co.uk./                                 PGP Key: 0x647E480C

"In cases of major discrepancy, it is always reality that got it wrong"
                                                        -- RFC 1118

fn:Benjamin Lewis (tc1415)
email;internet:ben lewis benl co uk

Attachment: signature.asc
Description: OpenPGP digital signature

[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]