performance in pd - audiobuf, etc

[Ricardo Climent]

On Mon, 11 Dec 2000 16:37:12 -0500 (EST) Karl MacMillan 
<karlmac at peabody.jhu.edu> wrote:

# Ricardo,
# 
# > I got these results now, 11.dec.2000:
# > G3/350 Blue- Motu2408 mkII 
# > Driver: ASIO PCI-324
# > 
# Thanks for the hard numbers!  How did you measure this?
# 
# Karl
#
-----------

There is a latency test patch written by L. Stuck for MSP.
It measures your system's input-output latency, by running a cable from 
your card's output (888/24, motu2408.... AMIII) to its input and 
boosting the output volume of your computer/card. So later you can 
also test by adding your external devices (i.e. mixer) to the loop, the 
amount of real latency you might have in a concert situation.
The delay test is a simple delay~ object set to 74 samples. By using 
the same patch as before, audio is passed through the delay~ and the 
delay time is measured. It an also be good to measure the delay of your 
own msp patches by replacing the delay~ object with your MSP patch.

In theory the motu2048 should have a latency around 6ms I think.

Ricardo
 
# 
# > In-out latency test: 
# > 2226 samples = 50.476189 ms
# > 
# > Delay lines:
# > 74 samples  = 1.678005 ms  
# > 
# > I have also found the fact that midi behaviour is quite unstable 
# > when using OMS, the Miditimepiece(USB) MTP AV under Macos 8.6 
# > and running MaxMSP. 
# > 
# > Ricardo
# > 
# > -------------------------------------------------
# > # 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                      |
# > # -----------------------------------------------------
# > # 
# > # 
# > 
# > 
# > 
# 
# -- 
# _____________________________________________________
# | Karl W. MacMillan                                 |
# | Computer Music Department                         |
# | Peabody Institute of the Johns Hopkins University |
# | karlmac at peabody.jhu.edu                           |
# | www.peabody.jhu.edu/~karlmac                      |
# -----------------------------------------------------
# 
# 

_____________________
Ricardo Climent