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Performance Co-Pilot
Aliases: pmidstr(3), pmidstr(3), pmIDStr_r(3), pmIDStr_r(3)


Performance Co-Pilot library and headers


Documentation and tutorial for the Performance Co-Pilot


pmIDStr, pmIDStr_r - convert a performance metric identifier into a string


#include <pcp/pmapi.h>
const char *pmIDStr(pmID pmid);
char *pmIDStr_r(pmID pmid, char *buf, int buflen);
cc ... -lpcp


For use in error and diagnostic messages, pmIDStr returns a ‘human readable’ version of the specified Performance Metric Identifier (PMID). The pmIDStr_r function does the same, but stores the result in a user-supplied buffer buf of length buflen, which should have room for at least 20 bytes.
Internally, a PMID is encoded with three fields: domain, cluster and item. pmIDStr returns a string with each of the fields appearing as decimal numbers, separated by periods.
The string value result from pmIDStr is held in a single static buffer, so the returned value is only valid until the next call to pmIDStr.


pmIDStr returns a pointer to a static buffer and hence is not thread-safe. Multi-threaded applications should use pmIDStr_r instead.


Environment variables with the prefix PCP_ are used to parameterize the file and directory names used by PCP. On each installation, the file /etc/pcp.conf contains the local values for these variables. The $PCP_CONF variable may be used to specify an alternative configuration file, as described in pcp.conf(5). Values for these variables may be obtained programmatically using the pmGetConfig(3) function.
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