[rrd-users] Re: Cumulative totals

[Ollie Maitland]

Awesome. Thank you to both you and Rene!
I have this working now :)

Alex van den Bogaerdt wrote:
> On Tue, Dec 05, 2006 at 11:39:57AM +0000, Ollie Maitland wrote:
>
>
>   
>> DS:Registrations2007:GAUGE:86400:0:1000
>> DS:TotalReg:COMPUTE:Registrations2007,PREV(TotalReg),+
>>     
>
> This isn't right.
>
>   
>> I have also tried:
>>
>> CDEF:TotalReg=TotalReg,PREV(Registrations2007),+
>>     
>
> This is closer.  However, you fail to see that
> PREV(Registrations2007) starts out as an unknown (the first
> time it is run refers to data outside the interval). Because
> <something>+<unknown> equals <unknown>, you end up adding
> unknowns each time.
>
> You don't need PREV(...), you can use PREV  (without the brackets)
> to find the previous value.
>
> Try changing unknown into zero; something like
>
> PREV,UN,0,PREV,IF
>
> This results in:
>   if the previous value was unknown
>      push zero on the stack
>   else
>      push the previous value on the stack
>
> Then add the current value of Registrations2007:
> PREV,UN,0,PREV,IF,Registrations2007,+
>
> This will reset to zero each time Registrations2007 was unknown
> in the previous round.  If you don't want this, alter unknowns
> for Registrations2007 into zero as well.
>
>   

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