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Re: Busy doing nothing
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Re: Busy doing nothing


  • Subject: Re: Busy doing nothing
  • From: Phil <email@hidden>
  • Date: Sat, 30 Aug 2008 01:57:06 +1200

On Fri, Aug 29, 2008 at 9:42 PM, Gerriet M. Denkmann
<email@hidden> wrote:
> If I add these magic lines it will use 0.2% of my Cpu just doing nothing:
>
>        NSMetadataQuery *query = [ [ NSMetadataQuery alloc] init];
>        [ query startQuery ];
>        [ query stopQuery ];
>        NSArray *results = [ query results ];   //
>  _NSMetadataQueryResultArray
>        [ query release ];
>
> From now on until quit I get every 100 msec  one Context Switch and two Mach
> System Calls - as observed via Activity Monitor.
>

It's noted in the documentation that using -results is "not
recommended due to performance and memory issues". My guess is that
Spotlight might be keeping something alive for it; you might want to
post this on the Spotlight-dev list, that's where the people who know
about Spotlight behind-the-scenes tend to hang out.

Phil
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  • Follow-Ups:
    • Re: Busy doing nothing
      • From: "Gerriet M. Denkmann" <email@hidden>
References: 
 >Busy doing nothing (From: "Gerriet M. Denkmann" <email@hidden>)

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