Emulated CPU instructions/second !?

amilo3438 · 28 November 2016, 12:44

Currently in approximate and fastest possible mode there is the slider where is possible to adjust the emulated CPU speed relative to the host CPU speed.

I wonder if would be possible to adjust the "emulated CPU" to run the given amount of "emulated CPU instructions/second" ?
For example, instead of the relative CPU slider to have a new one like: 0-10-20-30-40-50-60-70-80-90-MAX = in emulated CPU MIPS !

Or if not, than at least possibility to show the amount of emulated CPU instructions/second in MIPS somewhere on the WinUAE screen !?

Toni Wilen · 29 November 2016, 15:39

I don't see much use for that...

It is useless number and in Amiga CPU speed is very variable in non-expanded modes anyway and CPU is stopped when there is nothing to do (when AmigaOS is running and is idle). It would be unreadable randomly jumping value.

You also won't gain any compatibility (except accidentally) by adding yet another adjustment mode.

amilo3438 · 29 November 2016, 16:49

The idea was to have possibility to limit the max emulated (executed) cpu instructions/time !

Currently, in fastest possible mode is needed to adjust the cpu slider to be able to run some AGA demos, and that adjustment depend on the host PC Cpu speed. On some other PC that adjustment (i.e. configuration) would behave totally different! (slower or faster)

If there would be possibility to limit the number of max executed emulated instructions/time, I guess the same configuration would behave same on different pc configurations.

Toni Wilen · 30 November 2016, 19:41

Yes but if you are only asking it to make some demos work, it is wrong option because these kinds of speed hacks can't be stable, they will change between versions. I don't want to see something like "this demo works if you set CPU speed to exactly 87.8%". (No, it does not in next version).

amilo3438 · 30 November 2016, 20:41

Quote:

Originally Posted by Toni Wilen

I don't want to see something like "this demo works if you set CPU speed to exactly 87.8%".

No, this was just an example.

I would like to have "absolute speed" that does not depend on a host PC CPU speed as it is situation now, specially regarding quick configurations for A3000 and A4000. (it simply run too fast, faster than any real Amiga 4000)

But you still did not answer is it possible or not to limit the max executed/emulated cpu instructions per time? (also for JIT mode too)

I guess this would include counting of executed instructions and after reaching the given number of executed instructions in given time or if given time is reached but executed instructions is not, it will stop to execute until next counting, right?

EDIT: Thus with already existing "Fastest possible" and "Approximate" modes, there might be added a new "Absolute" mode. (so, nothing is changed, just one more "CPU Emulation Speed" mode would be added)

amilo3438 · 17 December 2016, 23:41

Quote:

Originally Posted by amilo3438

Currently in approximate and fastest possible mode there is the slider where is possible to adjust the emulated CPU speed relative to the host CPU speed.

Well, it seems the approximate mode does not depend on host PC speed !
(as mentioned here http://eab.abime.net/showpost.php?p=...&postcount=457 )

So maybe this request is not so important anymore now ! (IMHO)

28 November 2016, 12:44	#1
amilo3438 Amiga 500 User Join Date: Jun 2013 Location: EU Posts: 1,502	Emulated CPU instructions/second !? Currently in approximate and fastest possible mode there is the slider where is possible to adjust the emulated CPU speed relative to the host CPU speed. I wonder if would be possible to adjust the "emulated CPU" to run the given amount of "emulated CPU instructions/second" ? For example, instead of the relative CPU slider to have a new one like: 0-10-20-30-40-50-60-70-80-90-MAX = in emulated CPU MIPS ! Or if not, than at least possibility to show the amount of emulated CPU instructions/second in MIPS somewhere on the WinUAE screen !?

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29 November 2016, 15:39	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	I don't see much use for that... It is useless number and in Amiga CPU speed is very variable in non-expanded modes anyway and CPU is stopped when there is nothing to do (when AmigaOS is running and is idle). It would be unreadable randomly jumping value. You also won't gain any compatibility (except accidentally) by adding yet another adjustment mode.

29 November 2016, 16:49	#3
amilo3438 Amiga 500 User Join Date: Jun 2013 Location: EU Posts: 1,502	The idea was to have possibility to limit the max emulated (executed) cpu instructions/time ! Currently, in fastest possible mode is needed to adjust the cpu slider to be able to run some AGA demos, and that adjustment depend on the host PC Cpu speed. On some other PC that adjustment (i.e. configuration) would behave totally different! (slower or faster) If there would be possibility to limit the number of max executed emulated instructions/time, I guess the same configuration would behave same on different pc configurations.

30 November 2016, 19:41	#4
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	Yes but if you are only asking it to make some demos work, it is wrong option because these kinds of speed hacks can't be stable, they will change between versions. I don't want to see something like "this demo works if you set CPU speed to exactly 87.8%". (No, it does not in next version).

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