Re: [Rosegarden-user] Real-time Linux needed?

2011-02-26 Thread jimmy

If I remember correctly, real-time schedule and high resolution stuff used to 
be separate code patched to the main-line Linux kernel.  They were merged into 
the main Linux kernel around 2.6.30 (+/- a couple minor revisions, pardon my 
memory).

Those real-time folks took a little time off for one or two minor releases, but 
then started to work on new real-time patches to the kernel again.

For basic usage including audio and Midi, the standard kernel has all the code 
there already for most of us, no need to apply the current real-time patch.  
The only thing is there are various options including the 1000Hz clock 
frequency that Rosegarden checks for, they need to be enabled at compile time 
(of the kernel).  If your default distribution doesn't enable the 1000Hz clock, 
you may ask around within your distribution circle/forum on how to get that, or 
how to compile your own.

Even with the 1000Hz option enable, you may still need to add couple of lines 
in your one or two configuration files to allow a particular user-id to use it.

Jimmy



  

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[Rosegarden-user] Real-time Linux needed?

2011-02-24 Thread Ken Resander
A 'System Timer Resolution too low' dialog pops up when I click the yellow 
alert triangle icon in Rosegarden. 

Entering sudo modprobe snd-rtctimer from terminal did not work
(received message FATAL module snd_rtctimer not found).

I have read Ubuntu Studio supports better real-time processing than
normal Ubuntu so decided to upgrade from Ubuntu 10.10 to Ubuntu Studio
using the following from the commandline:

'sudo aptitude update  sudo aptitude install ubuntustudio-desktop 
ubuntustudio-audio ubuntustudio-audio-plugins ubuntustudio-graphics 
ubuntustudio-video linux-rt'

Lots of audio/video applications were installed, but linux-rt was not
present, so the netresult = Ubuntu + new audio applications.

Googled and found '[ubuntu_studio] Ubuntu Studio 10.10 no RT kernel' 
http://ubuntuforums.org/showthread.php?t=1602827.

We are just beginning using Rosegarden here and have no experience of 
computer-aided composition and recording, MIDI, synthesizing, 
sampling etc. 

What is the effect on Rosegarden of not having real-time?
Would it matter for beginners like us?

Ken
P.S. The PC is an oldish 1.8GHz AMD Athlon with 512MB DRAM that was quite
literally gathering dust until I gave it a last chance and installed Ubuntu 
10.10
a few days ago. Is this spec too slow for Rosegarden without RT kernel support?
What newer computer spec is likely to work? 64-bit OK for Rosegarden?



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Re: [Rosegarden-user] Real-time Linux needed?

2011-02-24 Thread Brett McCoy
On Thu, Feb 24, 2011 at 7:19 AM, Ken Resander kresan...@yahoo.com wrote:


 What is the effect on Rosegarden of not having real-time?
 Would it matter for beginners like us?

 Ken
 P.S. The PC is an oldish 1.8GHz AMD Athlon with 512MB DRAM that was quite
 literally gathering dust until I gave it a last chance and installed Ubuntu
 10.10
 a few days ago. Is this spec too slow for Rosegarden without RT kernel
 support?
 What newer computer spec is likely to work? 64-bit OK for Rosegarden?


I'm using Ubuntu Studio 10.10 with no realtime kernel, Rosegarden works fine
(along with Jack and other apps I use in conjunction with Rosegarden, like
Ardour, xjadeo, etc). Your machine needs more RAM, though, 512MB is pretty
tight, you'll be very limited with what you can do with plugins and other
programs that Rosegarden may need (like QSynth).

This may be apropos to your question also:

http://jackaudio.org/linux_rt_config

-- 
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In the rhythm of music a secret is hidden; If I were to divulge it, it
would overturn the world.
-- Jelaleddin Rumi
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Re: [Rosegarden-user] Real-time Linux needed?

2011-02-24 Thread Brett McCoy
There are PPAs also available of you need kernel-rt for Ubuntu, or you
can just get the vanilla source and build your own

On Thu, Feb 24, 2011 at 1:34 PM, steve conrad steve.x.con...@gmail.com wrote:
 Artist-X comes with a real time kernel and is based on Ubuntu, if you
 really want to have Ubuntu and kernel-rt together.

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-- 
Brett W. McCoy -- http://www.electricminstrel.com

In the rhythm of music a secret is hidden; If I were to divulge it,
it would overturn the world.
    -- Jelaleddin Rumi

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