[rrd-users] Re: Performance (Was: Help with Bash script to calc

Alex van den Bogaerdt wrote:

> > >I just use "date +%s" to get the unix time but how can I easily
>> >round this value ?
>>
>> etime=`date +%s`
>> step=300
>> etime=$(( ${etime} - ( ${etime} % ${step} ) ))
>
>etime=$(( ${etime} / ${step} * ${step} ))
>
>is 10% faster, at least on my system.


>/bin/date -d 19700101\ 00:00\ +0000\ ${etime}sec
>
>It means: the unix epoch (19700101 00:00, timezone UTC) and then
>${etime} seconds further in time (so: reverse of date +%s)

Thanks, works a treat. While I was at it, following from other
threads on performance, I've also tweaked my graphs to have one
pixel/sample and the performance boost is "quite acceptable" ! Not
only plotting speed, but memory consumption is very significantly
reduced - down from being touch and go if it would run out with 3/4G
RAM plus 1G swap to not swapping at all when plotting a stack of 254
in and 254 out values.

I'm most happy now :-)

Just waiting for the boss to ask why I've got such odd graphing periods !

Simon

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