pmtrace provides a simple command line interface to the trace
Performance Metrics Domain Agent (PMDA) and the associated pcp_trace
The default pmtrace behavior is to provide point trace data to the
trace PMDA, using the tag argument as the identifying name associated
with each trace point. The tag then becomes an instance identifier
within the set of trace.point metrics.
The -e option allows an arbitrary command to be executed. This
command will be measured as a transaction since it has well defined
start and end points. The information is made available through the
Trace data can be sent to the trace PMDA running on host, rather than
the localhost, using the -h option. This overrides use of the
environment variable PCP_TRACE_HOST.
The -q option suppresses messages from a successful trace, so that
pmtrace runs quietly.
The -c option allows an arbitrary counter value to be exported
through the trace.count metrics, while the -v option allows an
arbitrary floating point value to be exported through the
The -S option enables internal debugging and tracing. The value of
state is a bit-wise combination of debug flags as defined in
pmtracestate(3), and may be specified using the decimal or
hexadecimal syntax prescribed by strtol(3).
Since pmtrace uses the libpcp_trace library routines, the environment
variables PCP_TRACE_HOST, PCP_TRACE_PORT, and PCP_TRACE_TIMEOUT are
all honored. Refer to pmdatrace(3) for a detailed description of the
semantics of each.
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).
All are generated on standard error and are intended to be self-
The pmtrace exit status is always zero except when the -e option is
in use, in which case the exit status of command is returned.
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at ⟨http://www.pcp.io/⟩.
If you have a bug report for this manual page, send it to
email@example.com. This page was obtained from the project's upstream
Git repository ⟨git://git.pcp.io/pcp⟩ on 2017-03-13. If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page, or
you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
Performance Co-Pilot PCP PMTRACE(1)