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List:       rrd-developers
Subject:    [rrd-developers] Division error with RRDTool
From:       zabiziz () gmail ! com (Zabiziz Zaz)
Date:       2006-10-17 18:45:26
Message-ID: 73b1086e0610171145p7cc41136v2373854c425d2d6 () mail ! gmail ! com
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Hi,
I'm trying to use the command CDEF to do some division using rrdtool, but
the results that i'm getting isn't right.
The code:
"$rrd" graph teste.png \
-aPNG \
-h200 \
-w475 \
--interlaced \
--start=1160535600 \
--end=1160621999 \
--vertical-label=Kbps \
'DEF:TotGeral_Rx_bytes=/usr/local/clientes/graficos/total.rrd:RxBytes:AVERAGE'
\
'CDEF:TotGeral_Rx_bits=TotGeral_Rx_bytes,-8,*,1024,/' \
'DEF:RxOrghttp=/usr/local/clientes/graficos/SERPRO_MF_RJ/service_http.rrd:RxBytesOrg:AVERAGE'
\
'CDEF:RxOrghttp0=RxOrghttp,-8,*,1024,/' \
'CDEF:Perc_Geral_RxOrghttp0=RxOrghttp0,TotGeral_Rx_bits,/,100,*' \
'AREA:RxOrghttp0#746FAE' \
'GPRINT:RxOrghttp0:AVERAGE:Rx %3.1lfKbps' \
'GPRINT:TotGeral_Rx_bits:AVERAGE:Total (%2.3lf)\j' \
'GPRINT:Perc_Geral_RxOrghttp0:AVERAGE:Perc (%2.3lf)\j' \
'LINE:TotGeral_Rx_bits#000000' \


The result of GPRINT:

Rx=-111.6
Total=-1026.422
Perc=6.190

But Perc should be (-111.6/-1026.422 )*100 = 10.872

Anybody knows how to fix that?

Thanks!

Zabiziz


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