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Re: [Discuss-gnuradio] End-to-end delay question
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] End-to-end delay question |
Date: |
Wed, 23 May 2007 18:11:13 -0700 |
User-agent: |
Mutt/1.5.9i |
On Wed, May 23, 2007 at 10:30:32AM -0400, Michael Dickens wrote:
> On May 22, 2007, at 11:46 PM, Eric Blossom wrote:
> >pthread_attr_setschedpolicy is not the same thing as
> >sched_setscheduler. It's for setting up the attribute that is passed
> >pthread_create.
>
> Touché. Thanks for pointing that out ... should have been
> "pthread_setschedparam()" instead. This routine is, if I'm reading
> the MAN pages correctly, an exact parallel to "sched_setscheduler()",
> but in pthread terms. Here's the basic code:
That makes more sense.
> Interestingly, at least on OSX 10.4.9, all policies have a (min,max)
> priority of (15,47), and the default for any process is the mid-point
> (31). Thus for OSX, "real time" priority needs to be closer to the
> MAX than the mid-point. The default policy is "Other" (1), whatever
> that is.
They may be interpreted in different domains. That is, one range for
each policy. I suspect that this is spelled out somewhere in the OS/X
developer docs.
SCHED_OTHER is the normal "time sharing" algorithm. The details will
vary by implementation, but typically non-interactive or CPU bound
processes are penalized relative to interactive processes.
> But, again, for some reason 'configure' isn't registering that
> pthreads are available on OSX 10.4 ... which they clearly are. - MLD
Eric
- Re: [Discuss-gnuradio] End-to-end delay question, (continued)
- Re: [Discuss-gnuradio] End-to-end delay question, Bob McGwier, 2007/05/07
- Re: [Discuss-gnuradio] End-to-end delay question, Robert McGwier, 2007/05/07
- Re: [Discuss-gnuradio] End-to-end delay question, Steve Bunch, 2007/05/20
- Re: [Discuss-gnuradio] End-to-end delay question, Eric Blossom, 2007/05/21
- Re: [Discuss-gnuradio] End-to-end delay question, Michael Dickens, 2007/05/21
- Re: [Discuss-gnuradio] End-to-end delay question, Eric Blossom, 2007/05/22
- Re: [Discuss-gnuradio] End-to-end delay question, Michael Dickens, 2007/05/22
- Re: [Discuss-gnuradio] End-to-end delay question, Eric Blossom, 2007/05/22
- Re: [Discuss-gnuradio] End-to-end delay question, Michael Dickens, 2007/05/23
- [Discuss-gnuradio] Reconfigurable OFDM using the USRP - it's possible, here's a video, Keith Nolan, 2007/05/23
- Re: [Discuss-gnuradio] End-to-end delay question,
Eric Blossom <=
- Re: [Discuss-gnuradio] End-to-end delay question, Michael Dickens, 2007/05/24
- Re: [Discuss-gnuradio] End-to-end delay question, Eric A. Cottrell, 2007/05/22
Re: [Discuss-gnuradio] End-to-end delay question, Steve R Bunch, 2007/05/08
Re: [Discuss-gnuradio] End-to-end delay question, Tarun Tiwari, 2007/05/10