[rrd-users] Re: Stacked area's limit

Simon Hobson linux at thehobsons.co.uk
Sun Sep 24 11:59:30 MEST 2006

Steven Hartland wrote:

>Is there a stacked area's limit? I've got a graph with a
>large number of sources ~200 and my code which works just
>fine for smaller numbers starts to go all weird on me
>with this number of sources / stacks.
>The result being I loose all negative data ( the second
>~100 set of stacks ) and 95% totals go nan.

I have an application that graphs a stack of 254 positive plus a 
stack of 254 negative values (traffic by IP address). As long as it 
works then it works no differently to the same graphs using a dozen 
values - it's slow as it needs nearly 2G of memory and sometimes the 
system runs out of swap space. I didn't realise I'd need so much when 
I build the system and allowed 1G swap on a system with 256M ram - 
since upgraded to 1G ram.

Interestingly, I've noticed that the same graph needs increasing 
amount of memory as you go back in time - ie using coarser 


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