'\"macro stdmacro
.\"
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.TH PMGENMAP 1 "PCP" "Performance Co-Pilot"
.SH NAME
\f3pmgenmap\f1 \- generate C code to simplify handling of performance metrics
.\" literals use .B or \f3
.\" arguments use .I or \f2
.SH SYNOPSIS
\f3pmgenmap\f1
[\f2infile\f1]
.SH DESCRIPTION
.de CW
.ie t \f(CW\\$1\f1\\$2
.el \fI\\$1\f1\\$2
..
Given one or more lists of metric names in
.I infile
or on standard input,
.B pmgenmap
generates C declarations
and
.BR cpp (1)
macros suitable for use across the
Performance Metrics Programming Interface (PMAPI)
on standard output.
.PP
The declarations produced by
.B pmgenmap
simplify the coding for client applications using the PMAPI.
.PP
The input should consist of one or more lists of metric names of the form
.PP
.ft CW
.nf
.in +0.5i
listname {
    metricname1 symbolname1
    metricname2 symbolname2
    ...
}
.in
.fi
.ft 1
.PP
which will generate C and
.BR cpp (1)
declarations of the form
.PP
.ft CW
.nf
.in +0.5i
char *listname[] = {
#define symbolname1 0
    "metricname1",
#define symbolname2 1
    "metricname2",
    ...
};
.in
.fi
.ft 1
.PP
The array declarations produced are suitable as parameters to
.BR pmLookupName (3)
and the
.BR #define d
constants may be used to index the
.CW vset s
in the
.CW pmResult
structure returned by a
.BR pmFetch (3)
call.
.PP
Obviously,
.CW listname
must conform to the C identifier naming rules, each
.CW symbolname
must conform to the
.BR cpp (1)
macro naming rules, and each
.CW metricname
is expected to be a valid performance metrics name (see
.BR pmns (5)
for more details).
.PP
The input may include
.BR sh -style
comment lines, i.e. with a `\f3#\f1' 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:

.PP
.ft CW
.nf
.in +0.5i
# 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
.in
.fi
.ft 1
.PP

Produces the output:
.PP
.ft CW
.nf
.in +0.5i
/*
 * 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 */
.in
.fi
.ft 1
.SH EXAMPLE
For brevity we have removed the error handling code, and assumed the chosen
metrics do not have multiple values.
.PP
The input file
.PP
.ft CW
.nf
.in +0.5i
mystats {
    kernel.percpu.cpu.idle     IDLE
    kernel.percpu.cpu.sys      SYS
    kernel.percpu.cpu.user     USER
    hinv.ncpu                       NCPU
}
.in
.fi
.ft 1
.PP
produces the following C code, suitable for
.BR #include -ing
.PP
.ft CW
.nf
.in +0.5i
/*
 * 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",

};
.in
.fi
.ft 1
.PP
Using the code generated by
.BR pmgenmap ,
we are now able to easily obtain metrics from the Performance Metrics Collection
Subsystem (PMCS) as follows:

.PP
.ft CW
.nf
.in +0.5i
#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   idle\n", 
           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);
.in
.fi
.ft 1
.PP
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
.BR pmLookupDesc (3)
should have been called to determine the semantics of each metric.
.PP
More complete examples that demonstrate the use of
.B pmgenmap
which may be used as a basis for program development are included in the
PCP demos, e.g.
.IR $PCP_DEMOS_DIR/pmclient .
.SH FILES
.PD 0
.TP 10
.BI $PCP_VAR_DIR/pmns/ *
default PMNS specification files
.PD
.SH "PCP ENVIRONMENT"
Environment variables with the prefix
.B PCP_
are used to parameterize the file and directory names
used by PCP.
On each installation, the file
.I /etc/pcp.conf
contains the local values for these variables.
The
.B $PCP_CONF
variable may be used to specify an alternative
configuration file,
as described in
.BR pcp.conf (5).
.SH SEE ALSO
.BR cpp (1),
.BR PMAPI (3),
.BR pmFetch (3),
.BR pmLookupName (3),
.BR pmNewContext (3),
.BR pcp.conf (5),
.BR pcp.env (5)
and
.BR pmns (5).