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Re: iPad Pro apps given more memory?
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Re: iPad Pro apps given more memory?


  • Subject: Re: iPad Pro apps given more memory?
  • From: Jens Alfke <email@hidden>
  • Date: Wed, 09 Dec 2015 17:37:43 -0800

> On Dec 9, 2015, at 5:17 PM, Rick Mann <email@hidden> wrote:
>
> - By "virtual memory," I'm sure you don't mean it's swapping to disk (flash). Or do you? If not, how is it virtual?

All memory is virtual in any modern OS — the only thing that sees ‘real’ memory addresses is the kernel’s VM subsystem. ‘Virtual’ just means there’s a layer of indirection between address space and RAM.

On iOS it’s just that the address space normally allocated to apps (by malloc, etc.) isn’t backed by a swap file. So it doesn’t get paged out, but it’s also limited by the amount of physical RAM.

By “how much virtual memory you can use” I believe Rick means how much _address space_.

—Jens
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  • Follow-Ups:
    • Re: iPad Pro apps given more memory?
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References: 
 >iPad Pro apps given more memory? (From: Rick Mann <email@hidden>)
 >Re: iPad Pro apps given more memory? (From: Jens Alfke <email@hidden>)
 >Re: iPad Pro apps given more memory? (From: Rick Mann <email@hidden>)
 >Re: iPad Pro apps given more memory? (From: David Duncan <email@hidden>)
 >Re: iPad Pro apps given more memory? (From: Rick Mann <email@hidden>)
 >Re: iPad Pro apps given more memory? (From: David Duncan <email@hidden>)
 >Re: iPad Pro apps given more memory? (From: Rick Mann <email@hidden>)

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