performance in pd - audiobuf, etc

[d d]

Thanks Karl,
I think I may need some clarification if you have the time

Is there a way to force PD to use the ASIO drivers for my Echo/Layla in 
win2K (layla drivers are beta in win2K) and forsake the windows sound 
driver?

So with Linux (+ lowlatency kernel) you can actually get 5ms latency?
That is basically the timing I am looking for.
But I've never used Linux, so unless my linux friends help me, I'd be 
stranded with this as a solution :)

What you are saying is that Linux w/ RME hardware is the only way to get 
around 3-9ms latency with PD?

What about linux w/ multiple soundblasters or something?

Is it linux + lowlatency kernel that gets 5ms? or that bundled with RME 
hardware?

Thanks so much!

Also, very good to hear you mention MSP/motu which I was also considering as 
an alternative. So that fabled 6ms isn't really attainable, interesting. 
Good thing I know this now, as I have no mac's near me to test this on.

Thanks again everyone for their help,
I really don't want to buy a kyma :)
I'd much rather use PD, if I can get 5ms out of it, I will be ecstatic

-daniel

>Really the only way to fix this problem is to adapt PD to use ASIO
>drivers.  This was mentioned recently on the list, but the problem with
>the normal windows sound drivers is that they go through a kernel mixer
>(called kmixer - this allows more than one app to access a sound card
>simultaneously) that adds a minimum of 30ms.  It seems that a lot of pro
>cards circumvent this with their ASIO drivers.
>
>The best solution is linux, but then you don't get to use your layla
>because the manufacturer is not nice.  Of course, if you are willing to
>buy a macintosh you could just be an RME hammerfall card instead, install
>linux + low-latency kernel, and enjoy 5ms latency regardless of disk or
>cpu load.  As for the Macintosh latency I think that the 6ms measurement
>is not a real measure of end to end latency - I have never seen the
>Max/MSP machines that I have access to (G3s with MOTU 2408) get anything
>near that because of the complete inadequacy of the MacOS in all regards
>(sorry about that comment - I couldn't stop myself).
>
>Karl
>
>On Mon, 11 Dec 2000, Michael Lechasseur wrote:
>
> >
> > 	Perhaps you could dual boot to Linux?  I don't have any latency data 
>for PD
> > on Win2000, but if you'd like to write a latency test patch, I could run 
>it
> > on my system and send you the results?
> >
> > 	I've wanted to test this since applying the kernel low-latency patch, 
>and
> > have never gotten around to it.
> >
> > 	I have an Athlon 600, 64MB Ram, Redhat 6.2, Kernel 2.2.16 with the
> > low-latency patch.
> >
> > > -----Original Message-----
> > > From: d d [mailto:denglertdp at hotmail.com]
> > > Sent: Monday, December 11, 2000 1:02 PM
> > > To: pd-list at iem.kug.ac.at
> > > Subject: performance in pd - audiobuf, etc
> > >
> > >
> > > Hello, I'm new to PD, and have been using it sporadically for
> > > several weeks.
> > > It is extremely interesting, seems to do the things I can't do with my
> > > NordModular. My thanks to all who made it possible!
> > >
> > > I know you probably don't want to hear this question again, but I was
> > > wondering if there was a way to get real time audio processing
> > > performance
> > > out of PD. (windows 2000 pent III 500mHz, awe64, echo layla 20bit)
> > >
> > > I've tried adjusting all the command params, disabling devices, 
>changing
> > > audiobuf, etc
> > >
> > > Is there anyway to knock the latency to hardware like levels on
> > > my system?
> > > Even if the answer is different hardware, OS, etc
> > > I'm considering a Mac purchase because cycling74 claims w/
> > > certain hardware
> > > a 6ms latency can be had.
> > > Is anything this low possible with PD?
> > > I'd much rather stay within windows.
> > >
> > > Sorry for the bother with this question
> > >
> > > I'd like to have this ultimate control over processing/creating
> > > that PD can
> > > give, but I also need hardware like latency In/Out
> > > I don't want to spend money on a Kyma, because it seems logical that a 
>PC
> > > can do this sort of thing these days (what with the nifty fast chips 
>and
> > > all)
> > >
> > > Thanks all who read this far, sorry for the dull question
> > > -daniel
> > > _________________________________________________________________
> > > Get your FREE download of MSN Explorer at http://explorer.msn.com
> > >
> >
> >
>
>--
>_____________________________________________________
>| Karl W. MacMillan                                 |
>| Computer Music Department                         |
>| Peabody Institute of the Johns Hopkins University |
>| karlmac at peabody.jhu.edu                           |
>| www.peabody.jhu.edu/~karlmac                      |
>-----------------------------------------------------
>
>

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