[rrd-users] Re: PERCENT question

[rodrigo.santos at quantiza.com]

My script:

rrdtool graph  totals.png  --imgformat "PNG"  \
   DEF:total_out_bytes=/total.rrd:out_bytes:AVERAGE  \
   DEF:total_in_bytes=/total.rrd:in_bytes:AVERAGE  \
   CDEF:total_bytes=total_out_bytes,total_in_bytes,+  \
   CDEF:total_Mbps=total_bytes,.000008,*  \
   DEF:subnet_out_bytes=/subnet.rrd:out_bytes:AVERAGE  \
   DEF:subnet_in_bytes=/subnet.rrd:in_bytes:AVERAGE  \
   CDEF:subnet_bytes=subnet_out_bytes,subnet_in_bytes,+  \
   CDEF:subnet_Mbps=subnet_bytes,.000008,*  \
   'CDEF:subnet_in_bytes_pct=subnet_in_bytes'  \
   'CDEF:subnet_out_bytes_pct=subnet_out_bytes' \
   'CDEF:subnet_bytes_pct=subnet_bytes'  \
   'CDEF:subnet_Mbps_pct=subnet_Mbps'  \
   'CDEF:total_Mbps_pct=total_Mbps'  \
   'CDEF:div_Mbps_pct=subnet_Mbps,total_Mbps,/'  \
   'CDEF:subnet_pct=subnet_Mbps,100,*,total_Mbps,/'  \
   AREA:subnet_pct:AVERAGE:'subnet %.1lf%%'  \
   GPRINT:subnet_in_bytes_pct:AVERAGE:'subnet IN BYTES %lf'  \
   GPRINT:subnet_out_bytes_pct:AVERAGE:'subnet OUT BYTES %lf'  \
   GPRINT:subnet_bytes_pct:AVERAGE:'subnet BYTES (IN+OUT) %lf'  \
   GPRINT:subnet_Mbps_pct:AVERAGE:'subnet Mbps (BYTES*0.000008) %lf'  \
   GPRINT:total_Mbps_pct:AVERAGE:'total Mbps %lf'  \
   GPRINT:div_Mbps_pct:AVERAGE:'DIV (subnet/TOTAL)Mbps %lf'

  **The results:**

   subnet_in_bytes = 3.2090625
   subnet_out_bytes= 3.2090625
   subnet_bytes    = 6.418125 (IN+OUT) - OK
   subnet_Mbps     = 0.051345 (BYTES*0.000008) - OK
   TOTAL_Mbps      = 0.143296
   div_Mbps        = 0.272552 (subnet_Mbps/TOTAL_Mbps) <========== error

   using a calculator, subnet/TOTAL is 0.358314, but using the RPN
   expression:

   subnet/TOTAL   - 0.171951
   subnet/0.143296- 0.358314 OK
   0.051345/TOTAL - 2.863422 ???

   using a shell command for testing the ksh, worked fine:

   $ echo 0.051345 0.143296 | nawk '{printf("%0.6f\n", $1/$2);}'
   0.358314

   using a perl script for testing the perl, worked too:
   $ perl -e "print 0.051345/0.143296"
   0.358314258597588

Thanks,
Rodrigo

Leif Neland wrote:
> ---- Original Message ----
> From: <rodrigo.santos at quantiza.com>
> To: "Leif Neland" <leif at neland.dk>
> Cc: <rrd-users at list.ee.ethz.ch>
> Sent: Wednesday, December 28, 2005 2:08 PM
> Subject: [rrd-users] Re: PERCENT question
> 
>> Yes, this is my question: "How many percent is the subnet traffic of
>> the total?"
>>
>> using RPN expressions, I have:
>>
>> subnet = 0.059110
>> total  = 0.176248
>> using RPN expression 100,subnet,*,total,/ i have 12.02%
>>
>> but using a calculator, where:
>> 100 * subnet   = 5.911  / total = 33.53%
>> subnet / total = 0.3353 * 100   = 33.53%
>>
>> What is the problem with RPN expressions??
>>
> I did a "constant" CDEF:
> CDEF:t=t4,t4,-,100,0.059110,*,0.176248,/,+
> GPRINT:t:LAST:%5.2lf
> 
> It gives correctly 33.54, as expected.
> 
> ( t4,t4,- (equals zero) is just a quick trick to avoid the message:
> ERROR: Cannot parse vname from 'CDEF:100,0.059110,*,0.176248,/ )
> 
> Post the entire script using the RRD.
> 
> Leif
> 
> 
> 
> 
> 

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