Trying to get a function to call in nanoseconds efficiently

[ripdad]

Before I get started, I'm aware of "NtDelayExecution". It doesn't work very good for me.

But this does...

For $i = 1 To 100
    Sleep(0)
Next

I'm trying to delay a call to a function in nanoseconds with another function in a loop.

My question: Is there a safe and efficient function to do this with?

Sleep(0) seems to work, but I wondered if someone might know of a better function or perhaps another way.

Thanks for any constructive input or thoughts!

--Edit--

My target is about 250ns.

Anywhere in there would be fine.

 

 

Edited June 16, 2020 by ripdad

[Dan_555]

Hmm, i wrote a sleeper function, for this post: Mouse Recorder , to be able to access the tray menue while using sleep/delay.

Maybe you could use it instead of sleep ?
1000 for the $nr should be 1 second. 

Func Sleeper($nr)
    Local $varTS = _Timer_Init()
    While _Timer_Diff($varTS) < $nr
        ;CheckTray()
    WEnd
EndFunc   ;==>Sleeper

 

Edited June 16, 2020 by Dan_555

[TheXman]

55 minutes ago, ripdad said:

My target is about 250ns.

Given that AutoIt is an interpreted language, I seriously doubt that you can get anywhere near a 250ns pause.  On a 64-bit Windows 7 Pro OS, with an Intel i5 @ 3.1ghz, and no other apps running (only services), the following lines yield around a 4500ns diff.  That is just the time it takes to initialize a timer and then do an immediate time difference.  So in a loop, and depending on what else is running on the PC, the results would be an even bigger difference.  Another way to look at is that you are most likely seeing a bigger pause than 250ns when you execute your commands back to back, without any Sleep function.

$hTimer = TimerInit()
$nDiff = TimerDiff($hTimer)
MsgBox(0, "", "msecs = " & $nDiff & @CRLF & "nsecs = " & ($nDiff * 1000000))

 

[jchd]

Read this page: https://docs.microsoft.com/en-us/windows/win32/sysinfo/acquiring-high-resolution-time-stamps

Yet beware that the overhead implied by at least two AutoIt calls to any API could waste much more time than the period you aim to tick. Maybe devolve such task to machine code, inline or from a DLL.

[ripdad]

Thanks for all your reply's. I really do appreciate it.

I fear that reading any value with consolewrite or msgbox would slow it down even further.

I have been playing with it some more and found that this is sufficient enough for me.

For $i = 1 To 2
Next

Although, I have no idea what the reading would be without a literal read.

But, it works good enough. That's all that matters. Thanks again!

 

[Melba23]

ripdad,

This thread might be of interest for you:

M23

[ripdad]

Thanks Melba23. I did try ZwDelayExecution and NtDelayExecution. I didn't have good luck with either of them.

Not sure why at this point

---

I played with it some more and found that time is less a factor than another variable.

So, what I wanted was a way to expand an audio waveform live in as close to realtime as I could.

I knew I couldn't achieve realtime.

This graphic is as close as I could come to it without losing coherency of it...

I had a very hard time taking a screenshot of it. It was going by so fast!

This graphic may not mean much to most people, but to me, this is amazing to see it LIVE.

Every musical note with its time duration. And the detail is astounding.

---

There's an old saying: "there a hole in everything" -- And I found the hole that I was running into by accident.

Do you think music has holes in it? Well, not literal holes -- rather silence. In other words, zero volume.

And It does. More than most people know. This silence is what was tripping me up.

Why does music have silence? Two factors -- 1. natural and 2. unnatural.

These days, everything is digitally encoded. If you understand how they achieve that, then you'll understand what I'm saying.

I'm not going explain it here -- it would take too long.

---

What I wound up doing is cutting the bottom 3% of the volume out, which gets lost in the envelope anyways.

And what do you know? I works!

It does come at a CPU cost of about 50%. But well worth seeing.

In the end, the function call is in a While loop with nothing else. Time is whatever it takes to complete the waveform function.

Thanks everyone and have a good day!

 

[ripdad]

This graphic shows what it looks like with the silence left in it at that speed.

 

Edited June 17, 2020 by ripdad

[JockoDundee]

On 6/17/2020 at 7:07 AM, ripdad said:

There's an old saying: "there a hole in everything" -- And I found the hole that I was running into by accident.

Do you think music has holes in it? Well, not literal holes -- rather silence. In other words, zero volume.

And It does. More than most people know.

I’m not sure I’ve heard that “old saying”.  And I’m old; just saying

There is however another old saying, “what goes up, must come down.”  And so it is with sound; sound waves rise and fall in amplitude, many tens/hundreds or thousands of times a second.  As they do they inevitably pass thru 0 db sound pressure, or zero-crossing.

As for digital sound, it’s true that due to quantization that zero-crossings can be lengthened, depending on the sampling resolution.  However, this effect is typically seen (heard) at very quiet parts, like the very tail of a fade-out.  Moreover, any production recording includes dithering - random permutations of low-level noise specifically to prevent such artifacts.

So I’m not sure what you are trying to accomplish when you say:

On 6/17/2020 at 7:07 AM, ripdad said:

Every musical note with its time duration. And the detail is astounding.

Are you speaking only of the waveform graphic, or its audio or?

[JockoDundee]

On 6/16/2020 at 3:01 PM, ripdad said:

I have been playing with it some more and found that this is sufficient enough for me.

For $i = 1 To 2
Next

 

Just don’t run it on a different computer, or with a different load…

[water]

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