[rrd-users] Re: horizontal line

Alex van den Bogaerdt alex at ergens.op.het.net
Mon May 22 14:37:39 MEST 2006

On Mon, May 22, 2006 at 02:14:29PM +0200, Pavel Ruzicka wrote:

> > Alternatively, use an existing ds-name and discard it right away,
> > using POP.
> I tried it, but it doesn't works for me:
> push @args, "CDEF:maxbw=fin,POP,$maxbytes,*,8,/";

This is, indeed, an underflow.

After "fin,POP", the stack is empty.

Then you place $maxbytes on the stack.

Then you try to multiply, but multiplication needs two values. There
is only one value on the stack.

> I don't know what now, because HRULE is marked like (deprecated).

This was discussed (very) recently.  HRULE stays.

But there is another reason why you may want to use LINE instead:
HRULE only shows when the Y-axis is large enough.

LINE will _make_ the Y-axix large enough.

In other words: HRULE only shows if the rates approximate $maxbytes
(or if you have --upper-limit set high enough).  LINE will always
show (unless you have a low --upper-limit, and --rigid).

Alex van den Bogaerdt

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