[rrd-developers] RPN workaround to decrease IFs
Maris Janis Vasilevskis
mahris at myself.com
Mon May 16 10:32:07 CEST 2011
rrdtool create causes segmentation fault on COMPUTE with 4 IFs, but work with 3 IFs
(my environment: Centos 5.5, tested with RRD 1.4.4 and 1.4.5).
For one of possible workarounds, I should be sure about result of UNKN,0,/ - UNKN or INF?
Another ideas welcomed.
The task is elementary: computed cpuperc=cpuused/cpuall*100
4 data checks required:
1) cpuused unknown - result unknown
2) cpuall unknown - result unknown
3) cpuused>cpuall - bad data, result unknown
4) cpuall=0 - result 0
When I implement them using IF, segmentation fault occurs.
If I remove any of 4 IFs, create works normally.
A full sample causing segfault:
rrdtool create x1.rrd \
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