Its defined in the gmetad.conf , how the data is being polled
data_source "my cluster" [polling interval] address1:port addreses2:port ...
The keyword 'data_source' must immediately be followed by a unique
string which identifies the source, then an optional polling interval in
seconds. The source will be polled at this interval on average.
If the polling interval is omitted, 15sec is asssumed.
While graphing the data , It depends on the size of image you are graphing ,
When you are graphing for lets say two days for 300 width pixel graph , rrdtool
graph calculates a pixel value on a graph by its default reducing factor i.e
average, It averages the data so that you get uniform display of data points ,
If you increase your image size each pixel will hold less number of data points
i.e granular graph .
~saurabh
On 15-Mar-2011, at 12:08 PM, ZHANG Rongrong wrote:
> Yes. The “last hour data” and the “last two days data” is like this,
> ^
> ^
> 20 |
> 20|
> |
> |
> |
> |
> 10 |
> 10|
> |
> |
> |_________________________________>
> |___________________________________>
> 0 12:20 12:40 13:00
> 0 13 14
>
>
> I want to know if the data is calculated per minute or differently between
> these two graphs?
>
>
>
> Best regards,
> Rongrong
>
> Ext: 58606251
> Cell phone: 13581551124
> From: Bernard Li [mailto:[email protected]]
> Sent: 2011年3月15日 14:17
> To: [email protected]
> Subject: Re: [Ganglia-general] problem in interpreting the scale of ganglia
> graphic counters
>
> Hi Rongrong:
>
> Did you mean how frequently the metric data is collected? Or how does the
> "last hour data" get consolidated to "last two days data"?
>
> P.S. The images you have posted are too big, please either compress them or
> upload them to an external image hosting site and post the URL here. The
> mailing-list supports up to 40KB emails.
>
> Regards,
>
> Bernard
>
> 2011/3/14 ZHANG Rongrong <[email protected]>
> Please see these two pictures, the first is The Last Hour’s data, and the
> second is the Last Two Days data. We want to know the interval between the
> calcutation. I mean, how long does it calculate once?
>
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