Re: Print plot error

[Rob Mahurin]

On Aug 22, 2009, at 6:29 PM, Dmitri A. Sergatskov wrote:
> On Sat, Aug 22, 2009 at 4:32 PM, Ben Abbott<address@hidden> wrote:
> > I'm not sure I see the same thing ...
> >
> >  plot(1:10)
> >  for n = 1:25
> > > print -dpdf test.pdf
> > > system ('ps axu | grep gnuplot | wc -l');
> > > end
> > 6
> > 5
> > 6
> > 6
> > 6
>
>
> I think ps tranketes long output lines.
> Try
>
> system ('ps axwww | grep gnuplot | wc -l');

I can confirm this on both Linux and OS X 10.4.  Every Octave command  
like

        octave> print /tmp/out.pdf

adds one more defunct process to

        shell$ ps x -o pid,ppid,stat,command |
                awk '$3 ~ /Z/ {print}'

I think the solution is an occasional waitpid(-1,0,WNOHANG), but I'm  
not sure where in the code this goes.

Rob

--
Rob Mahurin
University of Manitoba, Dept. of Physics & Astronomy
at:     Oak Ridge National Laboratory   865 207 2594
        Oak Ridge, Tennessee            address@hidden