[rrd-users] Re: Performance problem updating many RRD files

[Tobias Oetiker]

Hi Alfredo,


>   I'm using RRDTool to store data series produces by
>   flowscan/JKFlow and I hit a performance problem updating many
>   files. With 256 Mb RAM caching works OK up to about 2000 RRDs,
>   but after that # performance fall suddenly. About 180Mb of RAM

yes rrdtool update performance is 'cache bound' ... I don't think
MMAP will help with this ... MMAP will make updating faster but the
difference is nowhere as large as what the cache does for you ...
add more memory and you can update more rrd files fast ...

cheers
tobi


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