performance in pd - audiobuf, etc

[Ricardo Climent]

On Mon, 11 Dec 2000 14:56:05 -0500 (EST) Karl MacMillan 
<karlmac at peabody.jhu.edu> wrote:

# Micheal,
# 
# 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
----------------------------------------
I got these results now, 11.dec.2000:
G3/350 Blue- Motu2408 mkII 
Driver: ASIO PCI-324

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                      |
# -----------------------------------------------------
# 
#