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Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-09-08, 10:26

in DOSBox Development

in DOSBox Development

A new toy to play with, threaded cycle handling. doom, 3dbench, diag report better results but quake isn't impressed, worse fps. Also changed the max from 90 to 100% Anyone know the problem games that led to limiting cpu usage to 90%? I haven't run across anything that has issues at 100, most games …

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-29, 07:04

in DOSBox Development

in DOSBox Development

Tidings and salutations, I bring news! Not fixed yet but I've narrowed it down, playing around locking various things to see the impact, lots of no difference but locking ret = (*cpudecoder)(); in Normal_Loop(void) in dosbox.cpp gets dac playback to run error free, albeit slowly. Continue going down …

Re: Win98 CPU speeds

Posted on 2020-08-25, 03:41

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There hasn't been a what's better EAX vs A3D debate(A3D BTW,) a "they aren't equivalent, I didn't mean that, given the way it was written that's how it was taken" interaction is what transpired. Nothing, except maybe price and availability, is stopping you from getting both (i.e. Creative and …

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-25, 02:22

in DOSBox Development

in DOSBox Development

There's setting "max" cycles and do once more it sets to 105% and then doesn't allow the user to go higher, which I'm looking to undo, would expect it to be a simple change to keep going with 110, 115, etc., I thought that handling wouldn't be so hard to spot, I was wrong. Maybe I've been away from …

Re: Win98 CPU speeds

Posted on 2020-08-25, 01:56

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There hasn't been a what's better EAX vs A3D debate(A3D BTW,) a "they aren't equivalent, I didn't mean that, given the way it was written that's how it was taken" interaction is what transpired.

Re: Win98 CPU speeds

Posted on 2020-08-24, 19:40

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Directly, no, but per the English language inferred, "..only an issue if you care about a3d.. that said, most of these games also support eax." At least how I read it more so than a separate statement.

Re: Win98 CPU speeds

Posted on 2020-08-24, 19:10

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Turn of the century A3D 2.0 games come to mind. Stuff like Deus Ex and Voyager Elite Force. This is only an issue if you care about A3D since Aureal Vortex cards don't work correctly under anything newer than Win9x. That said, most of these games also support EAX which works just fine under WinXP. …

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-23, 09:46

in DOSBox Development

in DOSBox Development

Ah, you threw me, pic stuff, as in irq, not pic stuff, as in audio video capture. I'll run through that , might even be the fix for the dac bug.

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-23, 09:25

in DOSBox Development

in DOSBox Development

What did you test with? Something with fm and dac playback I hope? I also accidentally left a log_msg running, did you comment that out? Another thing to do is cut the "max" headroom by about half.

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-23, 08:23

in DOSBox Development

in DOSBox Development

>You also need locks around all the pic stuff Not from what I see, what CAPTURE_AddWave touches that's referenced outside of it comes down to capture.video.audioused and capture.video.audiobuf, which is what got locked.

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-23, 07:02

in DOSBox Development

in DOSBox Development

Um, different animal, one is threading, the other I just put the guts of mixer_mix into mixer_callback, calling mixer_callback from mixer_mix, which seemingly produced a slight improvement, but doesn't mesh with the threading. Attached is threaded mixer_mix diff using sdl_delay and put back sdl_lock …

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-22, 18:11

in DOSBox Development

in DOSBox Development

krcroft, I've found that setting microseconds to 1000 is the magic number with your solution to condwait, system monitor showing the core running mix thread going from running at full tilt to using only what it needs like a sane process, with no fps hit seen from benching like with condwait, and no …

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-22, 04:11

in DOSBox Development

in DOSBox Development

For whatever reason this was giving me improved fps in quake. It's not threaded, basically stock. margin of error?

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-21, 17:58

in DOSBox Development

in DOSBox Development

It looked like sdl_lock/unlockaudio were being used as a generic mutex to me on internal mixer struct rather than sdl audio's obtained struct, in a sense they were, but internal mixer struct variables are being used in the sdl audio callback handler, not a problem adding them back, give the mix …

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-21, 08:24

in DOSBox Development

in DOSBox Development

If you look at the sdl source sdl_lock/unlockaudio are just mutex locks, redundant as far my understanding. I had removed the audio locks from adding the locks for condwait handling and just kept those with polling. I had played around with removing the locks, and when removed and trampling each …

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-21, 06:36

in DOSBox Development

in DOSBox Development

polling/domix was intended as a temp test to remove thread overhead as much as possible and workaound, but not really nice blasting a core at full speed, hilariously so for a light load, just to get around sdl's poor running routine, ideally would come up with something that does the same as …

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-20, 11:16

in DOSBox Development

in DOSBox Development

Checking mixer_mix(main thread), addsamples, dma read, pic_runqueue, normal_loop, and callbacks(ex. LOG_MSG("mythreadID sblaster GenerateDMASound %d",SDL_GetThreadID(NULL));) shows the audio handling is running in mixer_mix_thread as desired, with pic_runqueue and normal_loop in main shown to be …

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-20, 04:36

in DOSBox Development

in DOSBox Development

A mutex lock or wait on the capture_addwave end should take care that potential issue, assuming my threading understanding is up to speed, and already mutex locked on the mixdata side.

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-20, 04:12

in DOSBox Development

in DOSBox Development

Yes, what I note in the diff comments. I need to work out why, if I did the threading wrong, missed something(s) that are linked that keep from processing simultaniously, somehow still processing in main, or just that processing audio isn't significant anymore.

Re: Thread experimentation, threaded audio emulation and mixing.

Posted on 2020-08-20, 03:32

in DOSBox Development

in DOSBox Development

No comments? Not as much interest after all. fm overhead used to be a topic of discussion, but I guess not so much anymore. A solution to xwing being mute was to reduce cycles, as if it were an issue with sound card detection, perhaps pic cycling too fast with audio in a separate thread. As for dac …

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