NAME | SYNOPSIS | DESCRIPTION | EXAMPLE | FILES | PCP ENVIRONMENT | SEE ALSO | COLOPHON

PMGENMAP(1)                General Commands Manual               PMGENMAP(1)

NAME         top

       pmgenmap  -  generate C code to simplify handling of performance met‐
       rics

SYNOPSIS         top

       pmgenmap [infile]

DESCRIPTION         top

       Given one or more lists of metric names in infile or on standard
       input, pmgenmap generates C declarations and cpp(1) macros suitable
       for use across the Performance Metrics Programming Interface (PMAPI)
       on standard output.

       The declarations produced by pmgenmap simplify the coding for client
       applications using the PMAPI.

       The input should consist of one or more lists of metric names of the
       form

            listname {
                metricname1 symbolname1
                metricname2 symbolname2
                ...
            }

       which will generate C and cpp(1) declarations of the form

            char *listname[] = {
            #define symbolname1 0
                "metricname1",
            #define symbolname2 1
                "metricname2",
                ...
            };

       The array declarations produced are suitable as parameters to
       pmLookupName(3) and the #defined constants may be used to index the
       vsets in the pmResult structure returned by a pmFetch(3) call.

       Obviously, listname must conform to the C identifier naming rules,
       each symbolname must conform to the cpp(1) macro naming rules, and
       each metricname is expected to be a valid performance metrics name
       (see pmns(5) for more details).

       The input may include sh-style comment lines, i.e. with a `#' as the
       first non-blank character of a line, and these are translated on
       output to either single line or multi-line C comments in the K&R
       style.  For example, the input:

            # leading block of multi-line comments
            # initialization group
            foo {
                    a.b.c   ONE
                    d.e.f.g TWO
                    # embedded block of multi-lines
                    # comments and boring pad text
                    xx.yy.zz        THREE
            }

            # trailing single line comment

       Produces the output:

            /*
             * leading block of multi-line comments
             * initialization group
             */
            char *foo[] = {
            #define ONE 0
                    "a.b.c",
            #define TWO 1
                    "d.e.f.g",
            /*
             * embedded block of multi-lines
             * comments and boring pad text
             */
            #define THREE 2
                    "xx.yy.zz",

            };

            /* trailing single line comment */

EXAMPLE         top

       For brevity we have removed the error handling code, and assumed the
       chosen metrics do not have multiple values.

       The input file

            mystats {
                kernel.percpu.cpu.idle     IDLE
                kernel.percpu.cpu.sys      SYS
                kernel.percpu.cpu.user     USER
                hinv.ncpu                       NCPU
            }

       produces the following C code, suitable for #include-ing

            /*
             * Performance Metrics Name Space Map
             * Built by pmgenmap from the file
             * mystats.metrics
             * on Wed Dec 28 19:44:17 EST 1994
             *
             * Do not edit this file!
             */

            char *mystats[] = {
            #define IDLE    0
                    "kernel.percpu.cpu.idle",
            #define SYS     1
                    "kernel.percpu.cpu.sys",
            #define USER    2
                    "kernel.percpu.cpu.user",
            #define NCPU    3
                    "hinv.ncpu",

            };

       Using the code generated by pmgenmap, we are now able to easily
       obtain metrics from the Performance Metrics Collection Subsystem
       (PMCS) as follows:

            #define MAX_PMID 4

                int         trip = 0;
                int         numpmid = sizeof(mystats)/sizeof(mystats[0]);
                double      duration;
                pmResult    *resp;
                pmResult    *prev;
                pmID        pmidlist[MAX_PMID];

                pmNewContext(PM_CONTEXT_HOST, "localhost");
                pmLookupName(numpmid, mystats, pmidlist);
                pmFetch(numpmid, pmidlist, &resp);

                printf("%d CPUs: %d usr   %d sys   %d   idle0,
                       resp->vset[NCPU]->vlist[0].value.lval,
                       resp->vset[USER]->vlist[0].value.lval,
                       resp->vset[SYS]->vlist[0].value.lval,
                       resp->vset[IDLE]->vlist[0].value.lval);

       Some calls to ensure portability have been removed from the code
       above for the sake of clarity - the example above should not be used
       as a template for programming.  In particular, the raw values of the
       metrics were used when pmLookupDesc(3) should have been called to
       determine the semantics of each metric.

       More complete examples that demonstrate the use of pmgenmap which may
       be used as a basis for program development are included in the PCP
       demos, e.g.  $PCP_DEMOS_DIR/pmclient.

FILES         top

       $PCP_VAR_DIR/pmns/*
                 default PMNS specification files

PCP ENVIRONMENT         top

       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).

SEE ALSO         top

       cpp(1), PMAPI(3), pmFetch(3), pmLookupName(3), pmNewContext(3),
       pcp.conf(5), pcp.env(5) and pmns(5).

COLOPHON         top

       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
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       to man-pages@man7.org

Performance Co-Pilot                 PCP                         PMGENMAP(1)

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