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MamePPCA1
DosBox speed
Posted on: 2007/9/29 16:07    #1
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I have one question about DosBox,how can I improve its
speed ?
I try to change some settings on the dosbox.config file
but the speed is the same or similar.Cycles,screenmode.etc...

About the screenmode what's the best screenmode that fulfills all on my monitor surface?

In other words how can I view DosBox in real fullscreen
not only 60-65% of the screen?

Any ideas are really appreciated.
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corto
Re: DosBox speed
Posted on: 2007/9/30 13:15    #2
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@MamePPCA1

You could find advices on this page.

To swap to full screen mode, the special keys page tellls that you have to use alt-enter.

About speed, I looked at the sources yesterday and I suppose we can find many things to optimize.
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MamePPCA1
Re: DosBox speed
Posted on: 2007/9/30 18:30    #3
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@corto

OK I set up DosBox with the new settings and I am looking forward to see if it really improves the speed.
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AMike
Re: DosBox speed
Posted on: 2008/3/25 15:14    #4
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Hi,

is a A4000PPC 200Mhz fast enough to run dosbox?
Thank you

Regards
Michael
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Elwood
Re: DosBox speed
Posted on: 2008/3/25 15:31    #5
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@corto

Yes we need some Amiga coder to take a look at it. Other coders don't know what optimizing means

Philippe 'Elwood' FERRUCCI
Sam460ex 1.10 Ghz
http://elwoodb.free.fr
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Chris
Re: DosBox speed
Posted on: 2008/3/25 23:34    #6
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@AMike

It depends what you're running. I think it will seriously struggle though, it's bad enough on a 800MHz G4.

Welcome to Amigans.net btw.

Chris
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corto
Re: DosBox speed
Posted on: 2008/6/18 0:43    #7
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I've just uploaded DosBox 0.72 on os4depot, it should be faster. But it will be harder to optimize that I was thinking previously. But nothing is impossible.
I tested it on my ?AOne G3/800 with Kyrandia, Lost Vikings ... yeah !
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LiveForIt
Re: DosBox speed
Posted on: 2008/6/18 8:27    #8
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@AMike

I think DOSBox is interpreted emulation.

DOSBox was designed to run at speed of old DOS games, so maybe.

I hope some one writes an x86 to PPC JIT library it can be useful lots of things.
(NutsAboutAmiga)

Basilisk II for AmigaOS4
AmigaInputAnywhere
Excalibur
and other tools and apps.
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lazi
Re: DosBox speed
Posted on: 2008/6/18 10:49    #9
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@corto

Quote:

corto wrote:
I've just uploaded DosBox 0.72 on os4depot, it should be faster. But it will be harder to optimize that I was thinking previously.


Thanks Corto! I tested it, and this version has much better speed. The audio is not glitching anymore in the tested games.

IIRC there is a sourceforge effort to optimize DOSBox, but when I last checked it there was not much result yet.
http://sourceforge.net/projects/fastdosbox/

Bye!
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ToAks
Re: DosBox speed
Posted on: 2008/6/18 14:01    #10
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@corto

thanks alot for dooing this, much appriciated!

i notice a big improvement in this release compared to the older ones.

keep up the good work!.

cheers
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mufa
Re: DosBox speed
Posted on: 2008/6/18 19:54    #11
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@corto

NC and WIn 3.11 work perfect. Unfortunately if try run games (I tested Pinball Dreams and Archon ultra - Work ok, on old DOSBox version) always GR and crash

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corto
Re: DosBox speed
Posted on: 2008/6/18 23:32    #12
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LiveForIt : Yes, DosBox uses interpreted emulation. There modules with dynamic emulation but only for x86 of course.

mufa : I will try with more apps, I had no crash here, until now. Maybe because I used the GCC option -O3 and it may introduce optimization bugs :) I don't know, just an idea. Don't hesitate to tell me which game crashes.

lazi : What is the average CPU consumption ? What hardware do you use ?
Thanks for the link on fastdosbox but at the moment I failed to get the archive (site too slow). I am curious about the optimization ...

I think it will be hard to optimize DosBox because the code is really hard to understand and it would need much work to clean it all. I have one or two ideas that I will try.
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lazi
Re: DosBox speed
Posted on: 2008/6/19 2:04    #13
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@corto

Quote:

corto wrote:
lazi : What is the average CPU consumption ? What hardware do you use ?
Thanks for the link on fastdosbox but at the moment I failed to get the archive (site too slow). I am curious about the optimization ...


I tried with 3 games:

Locomotion - (simple 2D game, small moving sprites on static background)
0 frameskip - ~60% CPU

X-Wing

2 frameskip - ~80% CPU

Stonekeep - dos/4gw

2 frameskip - 100% CPU
This one is needs more power. It seems that the dos/4gw system is a tough one for DosBox because it swallows the full CPU power from the start of the application.

My machine is a mikro A1 with 750GX@800.

Good luck with the optimisation!

Bye!
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Chris
Re: DosBox speed
Posted on: 2008/6/19 21:00    #14
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@lazi

Quote:

Stonekeep - dos/4gw

2 frameskip - 100% CPU
This one is needs more power. It seems that the dos/4gw system is a tough one for DosBox because it swallows the full CPU power from the start of the application.


Don't use DOS4GW, use DOS32A instead - it works much better with DOSBox.
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lazi
Re: DosBox speed
Posted on: 2008/6/19 21:38    #15
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@Chris

Quote:

Chris wrote:

Don't use DOS4GW, use DOS32A instead - it works much better with DOSBox.


Thanks! I did not even knew about it. However it don't makes any effect on the speed of Stonekeep.
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Chris
Re: DosBox speed
Posted on: 2008/6/20 0:46    #16
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@MamePPCA1

I trust you did read the docs and ensure you were launching it with DOS32A rather than DOS4GW? (just checking)

At any rate, it is only marginally faster but a lot more stable. DOS4GW is buggy, so always use DOS32A with DOSBox if something needs it.

It may be that the problems with DOS4GW have been worked around in DOSBox since, but I'd still recommend to use DOS32A instead.
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lazi
Re: DosBox speed
Posted on: 2008/6/20 10:09    #17
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@Chris

Quote:

Chris wrote:
@MamePPCA1

I trust you did read the docs and ensure you were launching it with DOS32A rather than DOS4GW? (just checking)


Sure, I trashed dos4dw and renamed dos32a.
I don't know what is the problem with Stonekeep, but it is so slow from the point of lanching it. It may be bad coding or some bottlenecks of the emulation.
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