Re: Leopard performance penalty (3x slower), NSPopAutoreleasePool

FROM : John Stiles
DATE : Sat Nov 17 22:28:33 2007

A count of the number of seconds taken is not very useful.
However, Instruments (formerly Xray) or Shark should tell you exactly 
what is going on and why things are taking time.
You need to do some spelunking and compare the times coming out of 
Instruments or Shark in each OS.
And FWIW, if you haven't enabled garbage collection, I don't believe 
Leopard does anything more sophisticated memory-wise than Tiger.


On Nov 17, 2007, at 10:53 AM, Gerd Knops wrote:

> I have a complex Cocoa application, 10.4 SDK (no GC etc). Loading a 
> document (and performing a large number of calculations triggered 
> by that) takes 4 seconds under Tiger.
>
> Under Leopard, loading the same document takes 8 seconds until it 
> displays, after which the application is unresponsive for another 4 
> seconds, the entire time being spent in NSPopAutoreleasePool.
>
> I presume that performance penalty is largely due to Leopards more 
> complex memory handling. Has anybody else observed this, and knows 
> of any strategies to minimize that overhead?
>
> Thanks
>
> Gerd
>
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