PMLOADDERIVEDCONFIG(3) Library Functions Manual PMLOADDERIVEDCONFIG(3)
NAME
pmLoadDerivedConfig - load derived metric definitions from a file
C SYNOPSIS
#include <pcp/pmapi.h>
int pmLoadDerivedConfig(char *fname);
cc ... -lpcp
DESCRIPTION
Each line of the file fname is either a comment line (with a ``#'' in the first position of the line) or the declaration of a derived per-
formance metric, specified as:
* the name of the derived metric, using the same ``dot notation'' syntax that is used for PCP performance metrics, see PCPIntro(1) and
pmns(5).
* an equals sign (``='')
* a valid expression for a derived metric, as described in pmRegisterDerived(3).
White space is ignored in the lines.
For each line containing a derived metric definition, pmRegisterDerived(3) is called to register the new derived metric.
The result from pmLoadDerivedConfig will be the number of derived metrics loaded from fname else a value less than zero in the case of an
error.
EXAMPLE
# sample derived metric definitions
bad_in_pkts = network.interface.in.errors + network.interface.in.drops
# note the following would need to be on a single line ...
disk.dev.read_pct = 100 * delta(disk.dev.read) /
(delta(disk.dev.read) + delta(disk.dev.write))
SEE ALSO
PCPIntro(1), PMAPI(3) and pmRegisterDerived(3).
Performance Co-Pilot PMLOADDERIVEDCONFIG(3)
