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Performance Monitor Utilities | initial writing: 2000-07-17 last updated: 2001-04-13

PM is an extension to the facilities provided by the Performance Monitor foreign conjunctions (`6!:8` and`6!:13`), which are described in the J dictionary.
PM provides functions to turn the Performance Monitor on and off, and analyze and display the results. For the most part, you need only turn the Performance Monitor on, run your application, then display the results.
To load, enter:

       load 'jpm'

This populates the`jpm` locale. PM ignores any definitions in this locale, so PM definitions should be run directly from this locale, rather than from cover functions in the`z` or other locales.
The following are the main definitions:

| `start_jpm_` | set PM on
| `stop_jpm_` | set PM off
| `read_jpm_` | read PM data
| `showtotal_jpm_` | show totals
| `showdetail_jpm_` | show details
| `viewtotal_jpm_` | view totals
| `viewdetail_jpm_` | view details

The definitions`stop_jpm_` and`read_jpm_` are usually not required. If PM is on, any call to`read_jpm_` will call`stop_jpm_` ,`` while if the PM data has not already been read, any call to the show or view verbs will call`read_jpm_` first.

### Examples

First load`jpm` :

       load 'jpm'

#### Example 1

       start_jpm_ ''
       runapp ''
       showtotal_jpm_''
       showdetail_jpm_ 'runapp'
       showdetail_jpm_ 'printapp'

#### Example 2

The following runs PM for app1 and app3, but not app2:

       start_jpm_ ''
       app1 ''
       stop_jpm_ ''
       app2 ''
       start_jpm_ ''
       app3 ''
       showtotal_jpm_ ''

#### Example 3

       start_jpm_ ''
       runapp ''
       viewtotal_jpm_ ''

This displays the PM results in a grid. Detail results for any definition are shown by double-clicking the line in the grid.

### Definitions

`opt start_jpm_ size` | `` | `opt` = left argument to`6!:10` ,`` (default 1=all lines, 0=wrap) `size` = data area, or size of data area (if`''` uses`SIZE_jpm_`) Starts PM, with given options and buffer size. If PM is already on, the call is ignored.
`stop_jpm_ ''` |  | Stops PM. If PM is already off, the call is ignored.
`read_jpm_ ''` |  | Read the PM data. If PM is on, stops PM. If PM data has already been read, the call is ignored.
`opt showtotal_jpm_ names` |  | `opt` has 0 - 3 numbers: 0 - 0=time (default) 1=space 1 - 0=distinguish names by locales (default) 1=total names 2 - percentage of values show in detail (default 90) Show the PM total data. If PM data has not yet been read, calls`read_jpm_` first.
`opt showdetail_jpm_ name` |  | `opt` is 0=time (default) 1=space `name` is a single name, given as:`name_locale_` or`name;locale` Show the PM detail data for the given name. If PM data has not yet been read, calls`read_jpm_` first.
`opt viewtotal_jpm_ names` |  | View the PM total data in a grid. Arguments are the same as for`showtotal_jpm_` .
`opt viewdetail_jpm_ name` |  | View the PM total data in a grid. Arguments are the same as for`showdetail_jpm_` .

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