[rrd-users] setting last_update

[Dan Langille]

On 15 Feb 2007 at 16:23, Alex van den Bogaerdt wrote:

> On Thu, Feb 15, 2007 at 09:18:05AM -0500, Dan Langille wrote:
> 
> > FWIW, here is a test case I created by looking at what the symon code 
> > was doing:
> > 
> > rrdtool create cpu0.rrd --step=5 --start=0 DS:user:GAUGE:5:0:100 
> > DS:nice:GAUGE:5:0:100 DS:system:GAUGE:5:0:100 
> > DS:interrupt:GAUGE:5:0:100 DS:idle:GAUGE:5:0:100 
> > RRA:AVERAGE:0.5:1:34560 RRA:AVERAGE:0.5:360:672 
> > RRA:AVERAGE:0.5:1440:600 RRA:AVERAGE:0.5:17280:600 
> > RRA:MAX:0.5:1:34560 RRA:MAX:0.5:360:672 RRA:MAX:0.5:1440:600 
> > RRA:MAX:0.5:17280:600 RRA:MIN:0.5:1:34560 RRA:MIN:0.5:360:672 
> > RRA:MIN:0.5:1440:600 RRA:MIN:0.5:17280:600
> 
> Looking reasonable.  I only dislike "--start=0", which is
> probably harmless.
> 
> You could try a much more simple case as well:
> 
> rrdtool create test.rrd DS:x:GAUGE:600:U:U RRA:AVERAGE:0:1:5
> rrdtool dump test.rrd

That looks OK
# rrdtool dump test.rrd | less
<!-- Round Robin Database Dump --><rrd> <version> 0003 </version>
        <step> 300 </step> <!-- Seconds -->
        <lastupdate> 1171554437 </lastupdate> <!-- 2007-02-15 
07:47:17 PST -->

        <ds>
                <name> x </name>
                <type> GAUGE </type>
                <minimal_heartbeat> 600 </minimal_heartbeat>
                <min> NaN </min>
                <max> NaN </max>

                <!-- PDP Status -->
                <last_ds> UNKN </last_ds>
                <value> 0.0000000000e+00 </value>
                <unknown_sec> 137 </unknown_sec>
        </ds>

<!-- Round Robin Archives -->   <rra>
                <cf> AVERAGE </cf>
                <pdp_per_row> 1 </pdp_per_row> <!-- 300 seconds -->

                <params>
                <xff> 0.0000000000e+00 </xff>
                </params>
                <cdp_prep>
                        <ds>
                        <primary_value> 0.0000000000e+00 
</primary_value>
                        <secondary_value> 0.0000000000e+00 
</secondary_value>
                        <value> NaN </value>
                        <unknown_datapoints> 0 </unknown_datapoints>
                        </ds>
                </cdp_prep>
                <database>
                        <!-- 2007-02-15 07:25:00 PST / 1171553100 --> 
<row><v> NaN </v></row>
                        <!-- 2007-02-15 07:30:00 PST / 1171553400 --> 
<row><v> NaN </v></row>
                        <!-- 2007-02-15 07:35:00 PST / 1171553700 --> 
<row><v> NaN </v></row>
                        <!-- 2007-02-15 07:40:00 PST / 1171554000 --> 
<row><v> NaN </v></row>
                        <!-- 2007-02-15 07:45:00 PST / 1171554300 --> 
<row><v> NaN </v></row>
                </database>
        </rra>
</rrd>

> 
> 
> > I didn't supply the whole dump as it is 109,870 lines....
> 
> Heh... you thought "head -7" was to show off ?  :)
> 
> > The last date is 31900-02-14 16:00:00 PST / -38934592 and the first 
> > date is 31900-02-13 00:00:05 PST / -38948991
> 
> Negative numbers mixed with numbers larger than 32 bit.  Sounds
> like a signed/unsigned integer bug, undetected so far, and now
> the bug starts biting.
> 
> I could be totally wrong here.  I'm no programmer.

Should this be moved to the developers list?

-- 
Dan Langille : Software Developer looking for work
my resume: http://www.freebsddiary.org/dan_langille.php
PGCon - The PostgreSQL Conference - http://www.pgcon.org/