pcp-python has been replaced by pmpython(1) which is preferred,
however pcp-python is still installed to provided backwards
pcp-python provides a way to run python scripts using a customisable
python binary, rather than embedding any particular version of python
into each script.
This can be useful as it allows version-independent python code to be
run anywhere. All python modules shipped with PCP support versions
2.6 and later (in the python2 series), and 3.3 and later (in the
python3 release series).
Due to python monitoring and collecting scripts being relatively
simple in PCP (not requiring new modules, language features, etc), it
has been possible to ensure they work for all of the above python
versions. Thus, it is common for PCP python scripts to use a
"shebang" line that invokes pcp-python as follows:
This allows the custom setting to be injected instead of a hard-coded
python version, while still allowing the user to override the python
version as follows:
$ PCP_PYTHON_PROG=python3 /usr/bin/pcp python --version
$ PCP_PYTHON_PROG=python2 /usr/bin/pcp python --version
This is convenient for shipping identical scripts on multiple
platforms, and for testing different python versions with the one
script (e.g. in the case where multiple versions of python are
installed, PCP_PYTHON_PROG can be set in the local environment to
override the global setting).
By default, the value of PCP_PYTHON_PROG from /etc/pcp.conf will be
used. The default value of this configuration parameter is set
depending on some heuristics about the target build platform. These
heuristics favour the use of python3 in all recent releases of PCP,
for those platforms that support it.
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).
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
firstname.lastname@example.org. 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 PCP-PYTHON(1)