Re: [Leo] Strange Core Data vs. Spotlight issue

FROM : Melissa J. Turner
DATE : Thu Nov 08 22:46:28 2007

On Nov 8, 2007, at 13:11, Adam Knight wrote:

> On Nov 8, 2007, at 2:27 PM, Ben Trumbull wrote:
>

>> At 9:52 AM -0800 11/8/07, <email_removed> wrote:

>>> However the very strange thing is that I don't use Spotlight at 
>>> all.  I use Core Data in a document-based application that's not 
>>> saving files when this is happening.

>>
>> That's strange ... inconceivable.  Core Data doesn't do anything 
>> special with or for Spotlight.

>
> That's what I was thinking, but the system performed otherwise.
>

>> Have you checked the console log ?  I've found if an app logs 
>> constantly (sometimes from throwing exceptions) that it can really 
>> degrade the system performance.

>
> Yeah, nothing there.
>

>> What other I/O operations is your app doing besides reading an 
>> NSData ?  Are you creating or deleting a lot of files ?

>
> Absolutely nothing with the filesystem goes on when changing notes 
> other than a possible CD fault.  Though, in theory, it should keep 
> that object in memory for a period of time but this issue appears 
> even when going to and fro between two notes that should already be 
> in memory.  Indeed, it happened on an unsaved store as well (which 
> is even less possible...).
>

>> You could also try stepping along through gdb and seeing what area 
>> of code appears to trigger spotlight.  Without symbols, 
>> frustrating, but you might be able to gleam something.

>
> That does appear to be the next route.  Well, that and a lot of time 
> in Instruments.  However a co-worker of mine doesn't see this issue 
> at all, so it's getting more and more strange that my two computers 
> see it (one an upgrade install from Tiger and one a non-preserving 
> archive install from a previous Leo).  I'll keep poking around, I 
> suppose.  Very strange...
>


You might also want to try fsusage to check on what mds is opening 
while it thrashes. See if it's your notes file or a different one that 
seems to be causing the choking, or if it's something else and your 
just noticing the problem while in your application. In either case, 
you might want to track down spotlight importers and see if you've got 
any overlap on the files they try to import.

+Melissa