[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] More on latency
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] More on latency |
Date: |
Wed, 20 Oct 2010 23:10:53 -0700 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Oct 21, 2010 at 12:41:16AM -0400, Marcus D. Leech wrote:
> I had a flow-graph that earlier today had a latency of roughly 1 second
> or so.
>
> When I tested it this evening, after it had been running for several
> hours, the latency was
> back up to *several tens of seconds*!!!. Which means that external
> events at the source take
> several tens of seconds to show up at the sinks -- two graphical, and
> one filesink. WTF? !!
>
> The CPU load at the time was modest -- about 38%
38% of what? How many cores? What kind of machine?
It's possible that there's a computation in a single block that
requires > 1 core to compute in realtime.
Have you tried oprofile to see where the graph is spending its time?
Are you i/o bound? What's the rate that you're writing to the file sink?
I believe htop will show you all the threads of the process. Are any
of them consuming on the order of 100% of a single core?
Eric
- [Discuss-gnuradio] More on latency, Marcus D. Leech, 2010/10/21
- Re: [Discuss-gnuradio] More on latency,
Eric Blossom <=
- Re: [Discuss-gnuradio] More on latency, Marcus D. Leech, 2010/10/21
- Re: [Discuss-gnuradio] More on latency, Eric Blossom, 2010/10/21
- Re: [Discuss-gnuradio] More on latency, Marcus D. Leech, 2010/10/21
- Re: [Discuss-gnuradio] More on latency, Nick Foster, 2010/10/21
- Re: [Discuss-gnuradio] More on latency, Davek, 2010/10/21
- Re: [Discuss-gnuradio] More on latency, Nick Foster, 2010/10/21