[rrd-users] help please: graphing traffic totals

[Abraham van der Merwe]

Hi!

I would like to graph traffic totals over time, e.g.

time    value (byte/s)
1       10
2       30
3       20
4       25

Now on the graph it should be

time    value (bytes)
1       10
2       40
3       60
4       85

(actually it is a little bit more complicated because the samples are
obviously X minute averages, so it would have to by (x+prev_x)*60*y where Y
is the interval

The only way I could think of to do this is to use the PREV cdef function,
e.g.

------------< snip <------< snip <------< snip <------------
/usr/bin/rrdtool graph aki.png \
--imgformat=PNG \
--start=end-86400 \
--end=1087658594 \
COMMENT:"From 2004-06-18 17:23:14 to 2004-06-19 17:23:14\c" \
COMMENT:"Graph Generated at 2004-06-19 17:23:14\c" \
--title="aki - Traffic - FastEthernet0/0 - Facing towards mojo" \
--rigid \
--base=1000 \
--height=180 \
--width=500 \
--alt-autoscale-max \
--lower-limit=0 \
--base 1024 \
--vertical-label="bytes per second" \
DEF:a="aki_traffic_in_152.rrd":traffic_in:AVERAGE \
DEF:b="aki_traffic_in_152.rrd":traffic_out:AVERAGE \
CDEF:total=a,b,+ \
CDEF:sum="total,PREV(sum),+" \
LINE1:total#CC0000:"Total"  \
LINE2:sum#0000AA:"Previous"
------------< snip <------< snip <------< snip <------------

Iow, I have a database with traffic_in, traffic_out. Samples gathered every
5-minute interval.

Now, I sum in/out and then have the recursive CDEF function:

   sum=total,PREV(sum),+

However, if I run this, rrdgraph segfaults:

------------< snip <------< snip <------< snip <------------
root at oasis:/tmp/graph# ./gen.sh
./gen.sh: line 23:  4410 Segmentation fault      /usr/bin/rrdtool graph
aki.png --imgformat=PNG --start=end-86400 --end=1087658594 COMMENT:"From
2004-06-18 17:23:14 to 2004-06-19 17:23:14\c" COMMENT:"Graph Generated at
2004-06-19 17:23:14\c" --title="aki - Traffic - FastEthernet0/0 - Facing
towards mojo" --rigid --base=1000 --height=180 --width=500
--alt-autoscale-max --lower-limit=0 --base 1024 --vertical-label="bytes per
second" DEF:a="aki_traffic_in_152.rrd":traffic_in:AVERAGE
DEF:b="aki_traffic_in_152.rrd":traffic_out:AVERAGE CDEF:total=a,b,+
CDEF:sum="total,PREV(sum),+" LINE1:total#CC0000:"Total"
LINE2:sum#0000AA:"Previous"
root at oasis:/tmp/graph#
------------< snip <------< snip <------< snip <------------

Is there any other way to do this?

-- 

Regards
 Abraham

TODAY the Pond!
TOMORROW the World!
                -- Frogs (1972)

___________________________________________________
 Abraham vd Merwe - Frogfoot Networks CC
 1st Floor, Albion Springs, 183 Main Road, Newlands
 Phone: +27 21 689 3876 Cell: +27 82 565 4451
 Http: http://www.frogfoot.net/ Email: abz at frogfoot.net

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