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Internet News   Internet News : Memory Management in AmigaOS4.0 Explained
   posted by Rogue on 13-Dec-2005 21:05:03 (15469 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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-Sam- 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 21:29:07
#3 ]
Elite Member
Joined: 18-Apr-2003
Posts: 3012
From: Yorkshire Dales, United Knigdom

Vert interesting. How does this compare to the system that WindowsXP uses?


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Jamie_S 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 21:29:09
#4 ]
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Joined: 26-Oct-2003
Posts: 794
From: Purbeck, UK

Hmmmm technical /Homer

Sounds good... can't wait for final release. Keep up the good work Hyperion...


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RuDeE 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 21:32:52
#5 ]
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Joined: 26-Jul-2003
Posts: 154
From: Haugesund, Norway

Very interesting! Thanks guys!


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SlimJim 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 21:33:19
#6 ]
Cult Member
Joined: 9-Mar-2003
Posts: 693
From: Uppsala, Sweden

Interesting and a good read. I like that the website assumes some technical knowledge of the reader instead of just doing a mindless sales pitch. Looks professional and clean.
Who is writing this stuff anyhow? I'm sure the programmers supply the hard facts, but are they typing down the final touch too? Homever it is, is doing a good job - the text (and the website in general) have got a very nice blend of no-nonsense tech-info and juicy sales arguments.

I'm certainly no expert of memory systems, but I think I got the main idea of it at least.
.
SlimJim

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Step 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 21:38:43
#7 ]
Cult Member
Joined: 8-Jan-2003
Posts: 788
From: Stockholm, Sweden.

Nice article, it's not too long or complicated. Small spelling error in the first picture though, fraGmentation, it's a fairly large text so it shows more than if it had been in the article...


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Richi 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 21:44:55
#8 ]
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Joined: 25-Dec-2004
Posts: 158
From: Unknown

REALLY COOL!

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Anomaly 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 22:05:13
#9 ]
Member
Joined: 9-Sep-2003
Posts: 72
From: Sydney, Australia

Does the memory fragmentation diagram on page 1 of the article remind anyone else of the robot control mini-game in Paradroid?

Very interesting article, too...

Michael.

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EntilZha 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 22:08:43
#10 ]
OS4 Core Developer
Joined: 27-Aug-2003
Posts: 1679
From: The Jedi Academy, Yavin 4

Quote:
Who is writing this stuff anyhow?


This one was written by me, and then proof-read, clarified and largely re-written by two well-known Amiga writers, Richard Drummond and Andrew Korn


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

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-Sam- 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 22:13:00
#11 ]
Elite Member
Joined: 18-Apr-2003
Posts: 3012
From: Yorkshire Dales, United Knigdom

Cool. CUAmiga still lives...

Very fast typo editing too! - framentation!


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Bean 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 22:23:25
#12 ]
Super Member
Joined: 4-Apr-2003
Posts: 1225
From: U.K.

Nice article! ..and to think this is in OS4 is even better!

The object caching sounds interesting, it'll be good to get stuck into the new
autodocs.

Cheers,
Bean.


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Chris_Y 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 22:27:51
#13 ]
Elite Member
Joined: 21-Jun-2003
Posts: 3141
From: Beds, UK

Nice


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borchen 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 22:41:03
#14 ]
Member
Joined: 9-Sep-2003
Posts: 61
From: overthere...

@EntilZha

How does the memory-system of OS4 compare to that of Windows/Linux/Mac OSX?

Is this the most 'modern' way of memory handling?

P.S. it is indeed great to hear that some of the ex- CU-Amiga staff is still involved in the Amiga scene; I really liked their magazine..


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number6 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 22:49:43
#15 ]
Elite Member
Joined: 25-Mar-2005
Posts: 10881
From: In the village

@EntilZha &
Richard and Andrew

The article was excellent. So was the layout and the diagrams.
As always, the display was especially considerate when using Amiga browsers.
I am proud to associate with such -fine- work.

Best Wishes,
#6


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ikir 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 23:14:26
#16 ]
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Joined: 18-Dec-2002
Posts: 5646
From: Italy

A pint for Hyperion & Co.


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miksuh 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 23:15:17
#17 ]
Cult Member
Joined: 10-Mar-2003
Posts: 731
From: Espoo, Finland

Wery interesting indeed.

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PEB 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 23:20:17
#18 ]
Cult Member
Joined: 8-Mar-2003
Posts: 502
From: Unknown

A nicely written article. Thanks!

One thing though:
A couple of words (something like "the way") should be added to the first sentence.

Right now it is:
Quote:
Back in the old days of the original AmigaOS, the system used to allocate areas of unused memory to new tasks was pretty simple.


It should read something like:
Quote:
Back in the old days of the original AmigaOS, the way the system used to allocate areas of unused memory to new tasks was pretty simple.


Edit:
Actually it is fine in its original form. The thing that was throwing me off was taking the word "system" as referring to "AmigaOS;" but "system" in this sentence means "method." So all is good. Sorry for the unwarranted criticism.

Last edited by PEB on 14-Dec-2005 at 12:37 AM.

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Merc 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 23:21:18
#19 ]
Member
Joined: 4-Jan-2004
Posts: 75
From: Montreal, Quebec

@Anomaly:

Quote:

Does the memory fragmentation diagram on page 1 of the article remind anyone else of the robot control mini-game in Paradroid?


It didn't at the time I read the article, but now, yes! That was a really unique game, I loved the music and sfx.. That robot control part almost always ended with my droid exploding though :(

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Chunder 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 23:30:14
#20 ]
Super Member
Joined: 10-Mar-2003
Posts: 1956
From: The City of Xebec's Demise

Interesting article - well written and illustrated... but it raises some questions (naturally!)

1) Slab architecture was onbviously developed by Sun (see the references) - do they hold a patent on its use?

2) What other systems use this architecture? It appears to have been around since 1994 (in theory at least!) - if it hasn't been used, then is there a valid reason why not?

3) Could we have an illustration/example showing how the slab allocation process would deal with the fragmentation problem from the first set of examples (i.e. so we can compare what went wrong with the previous model, and how this has been resolved by this newer method)?

4) Does the implementation of this (radically different) memory allocation process break backwards compatibility, or is there a wrapper of some sort that mediates between the two methods? (Note however that I don't really give two hoots about full backwards compatibility - the quality of modern emulation is more than satisfactory!)

5) Is there an upper limit on the amount of memory that this architecture will support?

6) The process of caching object "hot spots" sounds interesting - is this something that a developer has to specifically expose to the memory API, or is it automatically and dynamically handled during run-time?

7) Do you actually have an operational version of your code which runs on multiple CPUs (and therefore *know* that it scales up in a linear manner) or is this something taken from the second reference (as indicated in the article) and is being borne in mind for the future...?

Apologies if any of these are covered in the references - it's a bit late to be delving into depp techincal documents, but if they answer any of my questions then I'd be more than happy to spend some time digging around myself... perhaps earlier in the evening!

Many many many thanks in advance to anyone who can clear these up for me!


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afxgroup 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 23:35:56
#21 ]
Super Member
Joined: 8-Mar-2004
Posts: 1966
From: Taranto, Italy

well done guys.. but it will use AllocVec or AllocVecNew or what??
it is a joke..

Anonymous..


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miksuh 
Re: Memory Management in AmigaOS4.0 Explained
Posted on 13-Dec-2005 23:36:15
#22 ]
Cult Member
Joined: 10-Mar-2003
Posts: 731
From: Espoo, Finland

Quote:
2) What other systems use this architecture?


Eg. Linux

Last edited by miksuh on 13-Dec-2005 at 11:38 PM.
Last edited by miksuh on 13-Dec-2005 at 11:37 PM.

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