Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

2 participants
7534 discussions

Re: [linux-audio-dev] latency and P4 hyperthreading?

by Taybin Rutkin

How does the P4 machine compare against itself with hyperthreading turned off? I'm not surprised that hyperthreading is slower than a true dual CPU setup. Two CPUs sharing their cache? That's got to increase cache misses. Taybin -------Original Message------- From: Fernando Pablo Lopez-Lezcano <nando(a)ccrma.Stanford.EDU> Sent: 06/02/03 09:05 PM To: linux-audio-dev(a)music.columbia.edu Subject: [linux-audio-dev] latency and P4 hyperthreading? > > Hi all, has anyone tested latency on a P4 machine with Hyperthreading support? (HT simulates two processors on one processor using - I guess - the spare time available in the cpu when it is waiting for, for example, memory accesses). Anyway, on a: P4 2.4G 800MHz fsb, 875P chipset, 1G ram, Seagate Barracuda V 60G drive: Booting into an smp kernel with HT enabled in the bios (kernel based on 2.4.21-rc6 with the usual low latency, preemptive and full acpi kernel patches) I see both processors, but the latency in the disk tests (using latencytest 0.42) has spikes that go up to 10/15 msecs, specially in the read/write test. If I boot into a up kernel, or if I boot with acpi=off I see only one processor and the latency for the disk tests is fine. Same kernel, same alsa on a dual Athlon MP 1800+ machine does not show any abnormal latency behavior so this seems to be confined to HT machines... :-( I guess "made up" processors are not as good as real ones :-) -- Fernando >

22 years, 8 months

[linux-audio-dev] Goodnews

by johnsonwilliams

Dear Sir, I am BarristerJohnson Williams Solicitor,the Personal Attorney to Mr Mark Dimitris a national of your country, who used to work with shell development company in Nigeria. On the 21st of April 1999, my client,his wife And their three children were in volved in a car accident along Sagamu/Lagos Express Road.unfortunately they All lost their lives in the event of the accident, Since then I have made several enquiries to your Embassy to locate any of in my clients extended relatives, this has also proved unsuccessful.After these several unsuccessful attempts, I decided to trace his relatives over the Internet, to locate any member of his family but tono avail, I contact you to assist me in receiving the money and property left behind by my client before they get confiscated or declared unserviceable by the bank where this huge deposits lodged.Particularly, the Bank where the deceased had an account valued at about $9 million dollars. Conseqently, The bank issued me a notice to provide the next of kin or have the account confiscated within the next ten official working days. since i have been unsuccesfull in locating the the relatives for over 3 years now I seek your consent to present you asthe next of kin of the deceased since you are from the same country so that the proceeds of this account valued at $9 million dollars can be paid to you and then you and me can share the money. 60% to me and 30% to you,while 10% should be for expenses or tax as your government may require.I have all necessary legal documents that can be used to back up any claim we may make. All I require is your honest cooperation to enable us see this deal through. I guarantee that this will be executed under a legitimate arrangement that will protect you from any breach of the law. Please get in touch with me by my email to enable usdiscuss further. Best regards, Barrister Johnson Williams

22 years, 8 months

[linux-audio-dev] Goodnews

by johnsonwilliams

22 years, 8 months

[linux-audio-dev] MVC again

by Juhana Sadeharju

Hello. It is still quite unclear to me how I actually would code the MVC type software. Can anyone give practical hints? Practical examples taken from existing software would be fine too. What open source software uses MVC? Most open source software seems to manipulate the model data in the GUI routines, I see. MVC sure is a great thing, but I would like to see a concrete toolkit or a hint list which helps me in making perfect MVC code immediately. Is it even possible to write a MVC toolkit? What would be in such a toolkit? Best regards, Juhana

22 years, 8 months

[linux-audio-dev] Radium V0.62alpha for linux.

by Kjetil S. Matheussen

***** This is an extremely informal release. The program is not useful yet for linux, but the porting is nearly there. So for anyone interested in looking at, in my opinion, the best :) graphical note-based music editor for any plattform, running in linux, here is a .tar.bz2 file: http://www.notam02.no/radium/bin/radium062_src.tar.bz2 ***** To make it run, cut and paste the following into a terminal: wget http://www.notam02.no/radium/bin/radium062_src.tar.bz2 bzip2 -d radium062_src.tar.bz2 tar xvf radium062_src.tar cd radium062_src cd radium ; ./build.sh cd .. ; make ./start.sh ***** Here is the homepage: http://www.notam02.no/radium/ ***** And here is a screenshot of 0.62 running in linux: http://www.notam02.no/radium/pictures/v062_linux.png (notice the runnning of xlib(editor), qt(fx selector), gtk(midi settings/help) and tk(playlist) simultaniously :)) --

22 years, 8 months

[linux-audio-dev] latency and P4 hyperthreading?

by Fernando Pablo Lopez-Lezcano

Hi all, has anyone tested latency on a P4 machine with Hyperthreading support? (HT simulates two processors on one processor using - I guess - the spare time available in the cpu when it is waiting for, for example, memory accesses). Anyway, on a: P4 2.4G 800MHz fsb, 875P chipset, 1G ram, Seagate Barracuda V 60G drive: Booting into an smp kernel with HT enabled in the bios (kernel based on 2.4.21-rc6 with the usual low latency, preemptive and full acpi kernel patches) I see both processors, but the latency in the disk tests (using latencytest 0.42) has spikes that go up to 10/15 msecs, specially in the read/write test. If I boot into a up kernel, or if I boot with acpi=off I see only one processor and the latency for the disk tests is fine. Same kernel, same alsa on a dual Athlon MP 1800+ machine does not show any abnormal latency behavior so this seems to be confined to HT machines... :-( I guess "made up" processors are not as good as real ones :-) -- Fernando

22 years, 8 months

[linux-audio-dev] Presentation & New project.

by ListBox

Hi to everybody... I'd like to introduce myself to you and to present you my new project. I'm a 26 year old programmer living on the Canary Islands. Unfortunately I'm new to Linux and I've been specializing on Pascar rather than on C. I'm a hobby musician and that's where my idea started. I seek people like me who'd like to help me to assemble a really good studio system with existing aAPIs and peaces of code. Today I uploaded my initial page which explains the project. Please have a look at http://laudio.freehomepage.com/index.html (my page) where I describe the project in detail. Comments are welcome. Thank you & greetz Merlin

22 years, 8 months

[linux-audio-dev] Horgand v0.90

by holborn

Hi! First Release. This program is released GNU/GPL version 2. Horgand is a organ, is my first attempt to do something with sound, generates sound like a FM synthesizer in real time. And i try to add some DSP effects, rotary, chorus, tremolo, delay ... Is Jack capable and recognizes MIDI Program Change (1-32), Volume, Modulation... Horgand is tested on a PIII 966 (Debian Sid ) and PII 300 (Gentoo). REQUERIMENTS: * FAST COMPUTER * LINUX * ALSA * JACK * FLTK 1.1 I'm musicien, not programer i do this only for fun. Take a look in http://personal.telefonica.terra.es/web/soudfontcombi/ Comments and patches will be apeciatted Josep

22 years, 8 months

[linux-audio-dev] A "best" event delegation strategy?

by Lukas Degener

Hi list, Here is a propblem that is propably already solved in another context, so i would like to know some opinions on it: I am trying to implement a (hopefully:-) ) simple general-purpose event delegation architecture. The actual application will propably be something like a network of modules that can do arbitrary filtering, generation and manipulation of midi events in real time. As propably different kinds of external event sources, like several midi ports, maybe joystick device and of course a gui, are involved, how would one efficiently organize the delegation of events passed between the modules, so that the everything is still thread-safe? The three main ideas i can currently think of are: A: don't do it at all, that is, everything is implemented as simple subject/observer patterns, so that the communication is a pure module-to-module thing. Mutexes et al, would have to be managed by each individual plugin. B: use a global, mutexed event queue. This could be a priority queue for time-stamped events, or a simple FIFO. C: use local queues. As above, but for each individual module. Each of the above aproaches seems to have its advantages and disatvantages. E.g. if queues are used, this would as far as i an judge, make it easy to have feedback cycles. OTOH this would propably introduce some overhead which aproach A wouldn't have. C would propably involve a single thread for each module, or a global "clock" thread that periodicaly calls an "process_queue" method on each module. Is there a general "best" way to do this? Kind regards, Lukas

22 years, 8 months

[linux-audio-dev] [ANN] tuneroid 0.9.3

by Jozef Kosoru

tuneroid 0.9.3 tuneroid is a tuner for variety of musical instruments. It is designed to tune musical instruments on PC using a microphone or directly connecting the instrument to the PC's sound card. http://www.uid0.sk/zyzstar/?tuneroid -- jozef kosoru http://www.uid0.sk/zyzstar

22 years, 8 months

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

Linux-audio-dev