Re: Real time IPC Octave/Java

[Paul Kienzle]

I doubt the octave interpreter and the underlying libcruft are
reentrant.  I know for sure that rand/randn from octave-forge
will not work properly with threads.

I do run fine with multiple sockets forking to different clients with

        octave-forge/main/miscellaneous/listen.cc

IIRC, the minimum round trip time I was getting from tcl to
octave and back was 40 ms, but in different environments
I observed times of up to 200 ms.  Somebody was working
on a Java client a while back, but I don't believe anything
has been posted.

It is possible to embed the entire octave interpreter in
another environment, but I don't know if this has been done
with java.

Paul Kienzle
address@hidden

On Jun 29, 2004, at 5:19 PM, Charles Fox wrote:

> Hi all,  I'm new to this list.  I'm a grad student in Pattern Analysis 
> in
> the UK and I have a question.
>
> I'm trying to build a real time audio pattern recogniser.  I've done 
> lots
> of high-level stuff in Java, and Java also has some good libraries for
> getting the audio input from the hardware.  However I'd like to use 
> Octave
> to do some signal processing on it.  There are multiple threads in the
> Java code, some of which deals with getting the input data, and many 
> more
> that do high-level inference.  I'd like the input threads to make 
> calls to
> my Octave code, and get the results back into Java again.  This all 
> has to
> be done fast as I'm dealing with multiple channels of audio input.   
> Note
> there will be many threads wanting to use the Octave functions at the 
> same
> time.  In Matlab the best way to do this is to compile the functions 
> into
> C with the Matlab->C compiler, then wrap them in Java JNI.  However 
> Octave
> (AFAIK) doesnt have a an Octave->C compiler, so I'm thinkiing about
> alternative ways using IPC such as pipes, shared memory.  There seems 
> to
> be pracically no documentaiton on any of this that I can find.... so 
> any
> suggestions or references on the best approaches would be really 
> helpful.
>
> Thanksm
>
> Charles Fox
> DPhil student
> Pattern Analysis & Machine Learning
> Robotics Research Group
> Dept. of Engineering Science
> University of Oxford, UK
> www.robots.ox.ac.uk/~charles
>
>
>
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Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
Subscription information:  http://www.octave.org/archive.html
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