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Internet News   Internet News : Memory Management in AmigaOS4.0 Explained
   posted by Rogue on 13-Dec-2005 21:05:03 (16118 reads)
A new article is available on os4.hyperion-entertainment.biz outlining the new and improved memory system on AmigaOS4.0. It describes the method of "slab allocators" and "object caching" that greatly reduce external memory fragmentation while keeping internal fragmentation to a guaranteed minimum and typically provides a constant-time memory allocation.

Read all about it on os4.hyperion-entertainment.biz.
    

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PosterThread
EntilZha 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 22-Dec-2005 11:39:37
#101 ]
OS4 Core Developer
Joined: 27-Aug-2003
Posts: 1679
From: The Jedi Academy, Yavin 4

Quote:
'd be interested to know the precise details of how you ensure that, but I guess it'd take too long!


See my PM... actually, you were right: There is a minimum, and that's because 12.5 % is 1/8 of 100 %, i.e. if you have 8 or more buffers per slab, then you're sure to limit the internal fragmentation...


_________________
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"I don't have a frigging clue. I'm norwegian" -- Ole-Egil

All opinions expressed are my own and do not necessarily represent those of Hyperion Entertainment

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ChrisH 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 22-Dec-2005 16:11:09
#102 ]
Elite Member
Joined: 30-Jan-2005
Posts: 6673
From: Unknown

OK, having looked at it in a lot more detail, I've realised that I was actually right in my original suspicion about how to calculate a family of suitable slab sizes (which keep fragmentation below 12.5%). Glad that I'm not completely thick :)

Last edited by ChrisH on 22-Dec-2005 at 06:06 PM.
Last edited by ChrisH on 22-Dec-2005 at 05:45 PM.
Last edited by ChrisH on 22-Dec-2005 at 05:21 PM.
Last edited by ChrisH on 22-Dec-2005 at 04:35 PM.
Last edited by ChrisH on 22-Dec-2005 at 04:16 PM.
Last edited by ChrisH on 22-Dec-2005 at 04:14 PM.
Last edited by ChrisH on 22-Dec-2005 at 04:13 PM.


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