Provided by: pcp_3.5.11_amd64
pmLoadDerivedConfig - load derived metric definitions from a file
#include <pcp/pmapi.h> int pmLoadDerivedConfig(char *fname); cc ... -lpcp
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 performance 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(4). * 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, BR 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.
# 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))
PCPIntro(1), PMAPI(3) and pmRegisterDerived(3).