Date: Sun, 29 Feb 2004 16:27:16 +0300 From: Sergey 'DoubleF' Zaharchenko <doublef@tele-kom.ru> To: zhangweiwu@realss.com Cc: questions@freebsd.org Subject: Re: scheduling priority not working? Message-ID: <20040229162716.15dca0ff@Hal.localdomain> In-Reply-To: <Law11-F26DplxgM2x1T000162a5@hotmail.com> References: <Law11-F26DplxgM2x1T000162a5@hotmail.com>
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--Signature=_Sun__29_Feb_2004_16_27_16_+0300_rWePAtX2E5+PhPtr Content-Type: text/plain; charset=US-ASCII Content-Disposition: inline Content-Transfer-Encoding: 7bit On Sun, 29 Feb 2004 19:07:12 +0800 "Zhang Weiwu" <weiwuzhang@hotmail.com> probably wrote: > Sergey 'DoubleF' Zaharchenko wrote: > > >There's more than nice to change priority; for example, check out > >rtprio(1) and idprio(1). Just FYI. > > > GREAT TOOL rtprio(1) is. Now I can run 'rtprio 5 mpg321 *.mp3' it produce > very smooth sound. Are you running the MP3 player as root? I wouldn't recommend it. I'd make a script using sudo and su'ing back to myself just after the priority change. FWIW this is what I use for listening to my music: sudo /usr/sbin/rtprio 5 /usr/bin/su df -c "/usr/local/bin/splay -s -2 /home/df/music/*" & Of course, I changed the suders file accordingly and wrote a script `mus' which includes the quoted line. rtprio is really powerful, and that's why it may be a bit dangerous. If a program which has run-time priority gets into a large amount of calculations, or into a busy-wait loop, all other programs will starve (the machine will appear hung). If you don't trust your MP3 player (or any program you set to have run-time priority) to be bullet-proof, you should think twice before using rtprio. Not that I have found many misbehaving programs, but I sometimes happen to write one:) -- DoubleF Truthful, adj.: Dumb and illiterate. -- Ambrose Bierce, "The Devil's Dictionary" --Signature=_Sun__29_Feb_2004_16_27_16_+0300_rWePAtX2E5+PhPtr Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFAQejAwo7hT/9lVdwRAvcSAJ4wjDWdQIeMploNzN+0WiHJnlk/9ACfa2JW ehGKQ6g/YoP2v0rEC0IKUro= =as7p -----END PGP SIGNATURE----- --Signature=_Sun__29_Feb_2004_16_27_16_+0300_rWePAtX2E5+PhPtr--
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