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Author Topic: [Ndless] Help with bottleneck on color calcs only  (Read 19236 times)

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Offline Matrefeytontias

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #15 on: June 27, 2014, 04:27:08 pm »
Alright so that's what to test. It's simply memcpy-ing a buffer to the screen 1000 times.
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Offline Streetwalrus

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #16 on: June 27, 2014, 05:08:45 pm »
This executed in about 6.5 seconds for me.
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Offline pimathbrainiac

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #17 on: June 27, 2014, 05:12:28 pm »
2.5 seconds on the GS CAS calc.
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Offline Streetwalrus

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #18 on: June 27, 2014, 05:13:22 pm »
Holy cow that's quite the difference. O.O So it's got to do with writing to the LCD being slow I guess.
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Offline Matrefeytontias

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #19 on: June 27, 2014, 05:15:04 pm »
But I never saw anything like that happen before ... There must be something Nspire-related I forgot to setup ... Could TCT_Local_Interrupts(int) be the cause of this ?
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Offline Streetwalrus

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #20 on: June 27, 2014, 05:16:05 pm »
Protip : always disable OS crap before doing anything. :P
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Offline Vogtinator

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #21 on: June 27, 2014, 05:39:53 pm »
I had to disable all IRQs and FIQs to get rid of the clock on screen, but TCT_Local_Control_Interrupts(0) should do the same.
But normally ndless itself does that already.

And matref, are you copying directly to SCREEN_BASE_ADDRESS? On GS calcs it's in SRAM and on CX in sdram because of it's size.
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Offline Matrefeytontias

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #22 on: June 27, 2014, 05:53:35 pm »
I'm indeed copying to *(void**)0xC0000010. So would allocating a buffer in RAM and using it even on color calcs fix the speed issue ? (hopeless try)
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Offline Vogtinator

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #23 on: June 27, 2014, 05:55:28 pm »
You shouldn't be able to write to SRAM if you're in 16bpp mode and filling the screen.
SRAM is 0xA4000000 - 0xA4020000 = 128 KiB and 320*240*16b= 150KiB
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Offline Matrefeytontias

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #24 on: June 27, 2014, 05:58:06 pm »
On monochrome calcs, I malloc two 320*240*2 buffers instead of one, one being an actual buffer and one acting as the screen. On color calcs I only allocate one buffer and use the default screen buffer.
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Offline Vogtinator

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #25 on: June 27, 2014, 06:02:15 pm »
I'm doing the same thing in nGL, but actually a third buffer, so the screen buffer is still usable after inversion.
So is the GS's SDRAM indeed that much slower?
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Offline Matrefeytontias

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #26 on: June 27, 2014, 06:03:55 pm »
Well, I don't know but I'll try that, and if that's it I'll call it another thing that we should know.

* Matrefeytontias would be so happy if that was the actual problem

EDIT : wait a minute you misunderstood. The program is 2.5 times faster on GS calcs than on color calcs, not the other way around.
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Offline aeTIos

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #27 on: June 27, 2014, 06:07:15 pm »
I decided to un-overclock my calc and re-run copyscreen1000times.12:53 seconds.
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Offline DJ Omnimaga

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #28 on: June 27, 2014, 06:12:02 pm »
Quote from: Matrefeytontias on June 27, 2014, 05:15:04 pm
But I never saw anything like that happen before ... There must be something Nspire-related I forgot to setup ... Could TCT_Local_Interrupts(int) be the cause of this ?

Could it be because of the same logic as with how slow it is to draw TI-84 Plus C Silver Edition pixels compared to TI-84 Plus Silver Edition ones due to the pixel data being much larger? I know the Nspire calcs are much faster and that the color ones can be overclocked higher, but still.
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Offline Matrefeytontias

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Re: [Ndless] Help with bottleneck on color calcs only
« Reply #29 on: June 27, 2014, 06:13:00 pm »
As I said, I set up both GS and color screen so they use the same number of bits for a pixel, for instance 16.
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