Weird resolution

Jean-Michel Vourgère <[email protected]> Thu, 27 Aug 2015 12:39:29 +0000
Newsgroups	gmane.comp.db.rrdtool.devel
Message-ID	<[email protected]>
This is a multi-part message in MIME format.
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Content-Type: text/plain; charset=utf-8
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Hi

While investigating an issue with PREV(), I found myself unable to
explain the resolution in that case:
- An rrd file "esel.rrd" is created by "create.sh" and filled by "fill.py".

Data is available:
- Every 2 minutes for 12 hours
- Every 8 minutes for 48 hours
- ...

When I graph starting at "end-12h" or "end-11h", I expected a 2 minute
resolution. But what I get is more like a 8 minutes one.
See attached "graph.sh" and the resulting png.
Width is 720 pixels wide: One pixel per minute on a 12 hours period.
The resolution is ok for 10 hours (smooth curve), but 11 hours and 12
hours yield a stair effect.

Is that a bug?

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--------------090004010506030907030202
Content-Type: text/x-python;
 name="fill.py"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename="fill.py"

#!/usr/bin/python
import rrdtool, datetime, calendar, math

now = datetime.datetime.now() - datetime.timedelta(seconds=60*4000)
for i in range(4000):
    time = calendar.timegm(now.timetuple())
    update_str = '{0}:{1}'.format(time, math.sin(i/200.)*5000)
    rrdtool.update('esel.rrd', update_str)
    now += datetime.timedelta(seconds=60)


--------------090004010506030907030202
Content-Type: application/x-shellscript;
 name="graph.sh"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
 filename="graph.sh"

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