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Re: [linrad] Re: Linrad, ps aux numbers, etc

Hello Roger,

Surprised and pleased to hear from you!
As I knew you wrote about Linrad and other DSP in your web site
and a CD provided at EME 2002 conference I've been wondering
wether your are watching here or not.
Thank you very much for your great work.

At 09:47 02/09/15 -0400, Roger W3SZ wrote:
[partly snipped]

>If you look at the bottom left of the Linrad screen, Leif has provided a
'>%time' readout.  Leif notes that this parameter indicates "% of the
>time available for processing within the dsp program".  On my system
>running with a 96000 Hz sampling rate and a 90+ KHz wide waterfall, with
>very aggressive parameters, this % time is (while sampling one of the
>famous FRH files) 28.3%.  It is a good index of what happens to
>processor load as you change parameters.

Yes, I know of the readout at the bottom left mine shows now 73.0%
whilst 'top' reports 98%. I'm afraid 73% is rather heavy.
Also, I have wcw_rx errors quite often, reboot forced.
If I use U command at the first opening causes 'segmentation violation'.
Following one more U command runs no problem.
Otherwise it runs fantastic, just different world!

>In spite of the 'ps' or 'top' numbers for CPU usage, my P4 1.4GHz has NO
>problem keeping up with Linrad even with a bunch of other stuff (88
>processes) running in the background.  So I wouldn't worry about the CPU
>number unless you are having trouble.  It's like Parkinson's Law; the
>work expands to fill the time available to it ;)

Thank you for 'top' information I've forgotten for long time, Hi.
It's really strange more than indicated 90% CPU load usually system
goes unusable as you know but this doesn't cause any problem.
I wouldn't worry about this too from know on.

>BY the way, I run with MMx and SIMD instructions.  If you are interested
>in a complete list of the parameters I am running, let me know and I'll
>email them to you.

Here is my /proc/cpuinfo;
flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat 
pse36 mmx fxsr sse
I think this incudes SIMD correct?

>If you want more information, type 't'
>when you have the waterfall display, etc running in Linrad and you will
>have much more information than you want ;)  It will also be in the
>bottom left corner of the screen.  You can 'zero' or restart the display
>by typing 'z'.

Oh wow! And 'a' (maybe more?) shows Amplitude margins I came to find, Hi.

>I hope that helps.  Let me know if there are any questions or

Thank you very much again for the nice input and we would appreciate
your further help.

Kohjin - JR1EDE