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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | PCP ENVIRONMENT | SEE ALSO | COLOPHON |
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PMDBG(1) General Commands Manual PMDBG(1)
pmdbg - report Performance Co-Pilot debug options
pmdbg code ...
pmdbg -l [-o] [-g]
pmdbg -D name[,name ...]
The components of the Performance Co-Pilot (PCP) use a global
mechanism to control diagnostic and debug output. Historically
this was a vector of bit-fields but this was later replaced by an
array of debug options. All of the bit-field debug controls have
an equivalent in the new scheme, but some new debug options
cannot be represented in the old bit-field scheme.
pmdbg with a -l option prints out all the debug options. If
there is no -g and no -o option then the output lists the name of
each option and some descriptive text.
With the -l and -g options the descriptive text is replaced with
an expression that can be used to set or print the corresponding
debug flag in gdb(1).
With the -l and -o options the output is for only the old bit-
fields with the mnemonic and decimal values of each the bit-field
along with some descriptive text.
Obviously the -o and -g options are mutually exclusive.
pmdbg with a -D option parses the list of names(s) using
__pmParseDebug(3) and reports the corresponding decimal value.
This use is not required in the new scheme, but for the old bit-
fields scheme it was useful when debugging and wanting to set the
internal value of the control vector (pmDebug) via a debugger,
e.g. gdb(1). For the new scheme, the same effect can be
achieved using the name of the option(s) and calling
pmSetDebug(3) from within the debugger.
The alternative usage also relates to the old bit-field scheme
and the code arguments are values for the debug vector, and the
bit-fields that are enabled by each of these values is listed.
Each code may be an integer, a hexadecimal value or a hexadecimal
value prefixed by either ``0x'' or ``0X''.
Most applications using the facilities of the PCP support a -D
name[,name ...] command-line syntax to enable debug control
using the name(s) of the desired debug options.
Alternatively the initial value of the debug control flags may be
set to either a value N (old scheme) or a comma-separated list if
option name(s) (new scheme) using the environment variable
$PCP_DEBUG. If both mechanisms are used the effect is additive,
so the resultant flags are those set via $PCP_DEBUG combined with
those set via any -D command line options.
The available command line options are:
-D name, --debug=name
Parse a comma-separated list of name(s) and report the
corresponding decimal value(s).
-l, --list
List all the debug options.
-g, --gdb
Output gdb(1) expressions with -l.
-o, --old
Use old-style output format with -l.
-?, --help
Display usage message and exit.
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).
PCPIntro(1), pmSetDebug(3), pmClearDebug(3), __pmParseDebug(3),
pcp.conf(5) and pcp.env(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 pcp@groups.io. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2024-06-14.
(At that time, the date of the most recent commit that was found
in the repository was 2024-06-14.) 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 to
man-pages@man7.org
Performance Co-Pilot PCP PMDBG(1)
Pages that refer to this page: dbpmda(1), pcpintro(1), pmcd(1), pmdaib(1), pmproxy(1), __pmcleanmapdir(3), pmda(3), pmdagetoptions(3), pmparsedebug(3), pmprintf(3), pmregisterderived(3), pmsetdebug(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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