Discarding Powershell client CPU negative values
Hi list,
I have a powershell client that is occasionally reporting negative values for CPU usage. Since that's not possible I wanted to pass along this easy modification for load average in the graphs.cfg for any clients that want to get rid of the negative values on their graphs. This doesn't remove them from the RRD, just discards values below 0 and above 1000 when generating the graph. Load cannot be negative so this may be something to include in the base configuration.
Here's a diff:
36,37c36 < CDEF:la_min0=avg,100,/ < CDEF:la=la_min0,0,1000,LIMIT
CDEF:la=avg,100,/
And here's what my graphs.cfg looks like now: [la] TITLE CPU Load YAXIS Load DEF:avg=la.rrd:la:AVERAGE CDEF:la_min0=avg,100,/ CDEF:la=la_min0,0,1000,LIMIT AREA:la#00CC00:CPU Load Average -u 1.0 GPRINT:la:LAST: \: %5.1lf (cur) GPRINT:la:MAX: \: %5.1lf (max) GPRINT:la:MIN: \: %5.1lf (min) GPRINT:la:AVERAGE: \: %5.1lf (avg)\n
Scot Kreienkamp | Senior Systems Engineer | La-Z-Boy Corporate One La-Z-Boy Drive | Monroe, Michigan 48162 | * 734-384-6403 | | * 7349151444 | * Scot.Kreienkamp at la-z-boy.com<mailto:%7BE-mail%7D> www<http://www.la-z-boy.com/>.la-z-boy.com<http://www.la-z-boy.com/> | facebook.<https://www.facebook.com/lazboy>com<https://www.facebook.com/lazboy>/<https://www.facebook.com/lazboy>lazboy<http://facebook.com/lazboy> | twitter.com/lazboy<https://twitter.com/lazboy> | youtube.com/<https://www.youtube.com/user/lazboy>lazboy<https://www.youtube.com/user/lazboy>
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Hi all,
i had this problem (with different monitors) from time to time as well. Scots suggestion will do the trick by suppressing the negativ values to be displayed at the graphs, but has some drawbacks:
Keep in mind that the aggregation of values in rrd takes all numbers from rrd file into account. That means your wrong negative number will impact your overall graph also for the positive numbers in the history, and can lead to a more or less wrong graph (dependend how many and of which values you have for negatives). This can result in some kind of very false trends in the longer term history, and you will not see where this comes from...
That means: better would be to fix the root cause (as always).
Norbert
From: Scot Kreienkamp <Scot.Kreienkamp at la-z-boy.com> To: "xymon at xymon.com" <xymon at xymon.com> Date: 14/12/2016 16:22 Subject: [Xymon] Discarding Powershell client CPU negative values Sent by: "Xymon" <xymon-bounces at xymon.com>
Hi list,
I have a powershell client that is occasionally reporting negative values for CPU usage. Since that’s not possible I wanted to pass along this easy modification for load average in the graphs.cfg for any clients that want to get rid of the negative values on their graphs. This doesn’t remove them from the RRD, just discards values below 0 and above 1000 when generating the graph. Load cannot be negative so this may be something to include in the base configuration.
Here’s a diff:
36,37c36 < CDEF:la_min0=avg,100,/ < CDEF:la=la_min0,0,1000,LIMIT
CDEF:la=avg,100,/
And here’s what my graphs.cfg looks like now: [la] TITLE CPU Load YAXIS Load DEF:avg=la.rrd:la:AVERAGE CDEF:la_min0=avg,100,/ CDEF:la=la_min0,0,1000,LIMIT AREA:la#00CC00:CPU Load Average -u 1.0 GPRINT:la:LAST: \: %5.1lf (cur) GPRINT:la:MAX: \: %5.1lf (max) GPRINT:la:MIN: \: %5.1lf (min) GPRINT:la:AVERAGE: \: %5.1lf (avg)\n
Scot Kreienkamp | Senior Systems Engineer | La-Z-Boy Corporate One La-Z-Boy Drive | Monroe, Michigan 48162 | ( 734-384-6403 | | ) 7349151444 | * Scot.Kreienkamp at la-z-boy.com www.la-z-boy.com | facebook.com/lazboy | twitter.com/lazboy | youtube.com/ lazboy
This message is intended only for the individual or entity to which it is addressed. It may contain privileged, confidential information which is exempt from disclosure under applicable laws. If you are not the intended recipient, you are strictly prohibited from disseminating or distributing this information (other than to the intended recipient) or copying this information. If you have received this communication in error, please notify us immediately by e-mail or by telephone at the above number. Thank you._______________________________________________ Xymon mailing list Xymon at xymon.com http://lists.xymon.com/mailman/listinfo/xymon
Excellent point Norbert, one that I had considered as well. I chose to do what I did because otherwise the graph was unreadable and unuseable. I would rather have small parts incorrect and still be able to use the graph to visualize the overall history. I would much rather the source be corrected.
As an alternative, the RRD for load could (and arguably should, since load cannot be negative) be set to reject negative numbers without any harm to the accuracy. That was my original goal, but I was unable to quickly figure out a way to do so.
Scot Kreienkamp | Senior Systems Engineer | La-Z-Boy Corporate One La-Z-Boy Drive | Monroe, Michigan 48162 | Office: 734-384-6403 | | Mobile: 7349151444 | Email: Scot.Kreienkamp at la-z-boy.com From: Xymon [mailto:xymon-bounces at xymon.com] On Behalf Of Norbert Kriegenburg Sent: Wednesday, December 14, 2016 10:47 AM To: xymon at xymon.com Subject: Re: [Xymon] Discarding Powershell client CPU negative values
Hi all,
i had this problem (with different monitors) from time to time as well. Scots suggestion will do the trick by suppressing the negativ values to be displayed at the graphs, but has some drawbacks:
Keep in mind that the aggregation of values in rrd takes all numbers from rrd file into account. That means your wrong negative number will impact your overall graph also for the positive numbers in the history, and can lead to a more or less wrong graph (dependend how many and of which values you have for negatives). This can result in some kind of very false trends in the longer term history, and you will not see where this comes from...
That means: better would be to fix the root cause (as always).
Norbert
[Inactive hide details for Scot Kreienkamp ---14/12/2016 16:22:26---Hi list, I have a powershell client that is occasionally rep]Scot Kreienkamp ---14/12/2016 16:22:26---Hi list, I have a powershell client that is occasionally reporting negative values for CPU usage. S
From: Scot Kreienkamp <Scot.Kreienkamp at la-z-boy.com<mailto:Scot.Kreienkamp at la-z-boy.com>> To: "xymon at xymon.com<mailto:xymon at xymon.com>" <xymon at xymon.com<mailto:xymon at xymon.com>> Date: 14/12/2016 16:22 Subject: [Xymon] Discarding Powershell client CPU negative values Sent by: "Xymon" <xymon-bounces at xymon.com<mailto:xymon-bounces at xymon.com>>
Hi list,
I have a powershell client that is occasionally reporting negative values for CPU usage. Since that’s not possible I wanted to pass along this easy modification for load average in the graphs.cfg for any clients that want to get rid of the negative values on their graphs. This doesn’t remove them from the RRD, just discards values below 0 and above 1000 when generating the graph. Load cannot be negative so this may be something to include in the base configuration.
Here’s a diff:
36,37c36 < CDEF:la_min0=avg,100,/ < CDEF:la=la_min0,0,1000,LIMIT
CDEF:la=avg,100,/
And here’s what my graphs.cfg looks like now: [la] TITLE CPU Load YAXIS Load DEF:avg=la.rrd:la:AVERAGE CDEF:la_min0=avg,100,/ CDEF:la=la_min0,0,1000,LIMIT AREA:la#00CC00:CPU Load Average -u 1.0 GPRINT:la:LAST: \: %5.1lf (cur) GPRINT:la:MAX: \: %5.1lf (max) GPRINT:la:MIN: \: %5.1lf (min) GPRINT:la:AVERAGE: \: %5.1lf (avg)\n
Scot Kreienkamp | Senior Systems Engineer | La-Z-Boy Corporate One La-Z-Boy Drive | Monroe, Michigan 48162 | • 734-384-6403 | | • 7349151444 | • Scot.Kreienkamp at la-z-boy.com<mailto:%7BE-mail%7D> www<http://www.la-z-boy.com/>.la-z-boy.com<http://www.la-z-boy.com/> | facebook.<https://www.facebook.com/lazboy>com<https://www.facebook.com/lazboy>/<https://www.facebook.com/lazboy>lazboy<http://facebook.com/lazboy> | twitter.com/lazboy<https://twitter.com/lazboy> | youtube.com/<https://www.youtube.com/user/lazboy>lazboy<https://www.youtube.com/user/lazboy>
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This message is intended only for the individual or entity to which it is addressed. It may contain privileged, confidential information which is exempt from disclosure under applicable laws. If you are not the intended recipient, you are strictly prohibited from disseminating or distributing this information (other than to the intended recipient) or copying this information. If you have received this communication in error, please notify us immediately by e-mail or by telephone at the above number. Thank you._______________________________________________ Xymon mailing list Xymon at xymon.com<mailto:Xymon at xymon.com> http://lists.xymon.com/mailman/listinfo/xymon
participants (2)
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norbert.kriegenburg＠de.ibm.com
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Scot.Kreienkamp＠la-z-boy.com