Re: Shark on MacBook Air
Re: Shark on MacBook Air
- Subject: Re: Shark on MacBook Air
- From: "Shawn Erickson" <email@hidden>
- Date: Fri, 22 Feb 2008 11:16:18 -0800
On Fri, Feb 22, 2008 at 9:46 AM, David Dunham <email@hidden> wrote:
>
> On 20 Feb 2008, at 11:21, Rick Altherr wrote:
>
> >> I started doing some performance analysis of a game that uses
> >> OpenGL, and happened to be using a MacBook Air. I'm seeing results
> >> very different than I'd expect:
> >>
> >> 0.0% 81.8% mach_kernel dtrace_get_cpu_int_stack_top
> >>
> >> Most of this time is in
> >>
> >> 0.1% 79.8% com.apple.driver.AppleIntelGMAX3100
> >> IOIntel965GLContext::clientMemoryForType(unsigned long, unsigned
> >> long*, IOMemoryDescriptor**)
>
>
> > Without more of the tree, I can't say much as to what the root
> > cause it. However, it's likely that your kernel is stripped so
> > Shark is guessing as to which symbol contains the address in the
> > call stack. dtrace_get_cpu_int_stack_top was likely the closest
> > symbol to the address.
>
>
> Thanks, that must be the issue.
You should be able to download and use a KernelDebugKit
(<http://developer.apple.com/sdk/>) to deal with this issue.
<http://developer.apple.com/documentation/DeveloperTools/Conceptual/SharkUserGuide/AdvancedProfileAnalysisandDataMining/chapter_7_section_2.html>
-Shawn
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