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.. _AutomateProblemDetection:
Automate performance problem detection
################################################
1. Start **pmieconf** interactively (as the superuser).
.. code-block:: bash
pmieconf -f ${PCP_SYSCONF_DIR}/pmie/config.demo
Updates will be made to ${PCP_SYSCONF_DIR}/pmie/config.demo
pmieconf>
2. List a single rule:
.. code-block:: bash
pmieconf> list memory.swap_low
rule: memory.swap_low [Low free swap space]
help: There is only threshold percent swap space remaining - the system
may soon run out of virtual memory. Reduce the number and size of
the running programs or add more swap(1) space before it completely runs out.
predicate =
some_host (
( 100 * ( swap.free $hosts$ / swap.length $hosts$ ) )
< $threshold$ && swap.length $hosts$ > 0 )
vars: enabled = no
threshold = 10%
pmieconf>
3. List one rule variable:
.. code-block:: bash
pmieconf> list memory.swap_low threshold
rule: memory.swap_low [Low free swap space]
threshold = 10%
pmieconf>
4. Lower the threshold for the **memory.swap_low** rule, and also change the **pmie** sample interval affecting just this rule. The **delta** variable is special in that it is not associated with any particular rule; it has been defined as a global **pmieconf** variable.
.. code-block:: bash
pmieconf> modify memory.swap_low threshold 5
pmieconf> modify memory.swap_low delta "1 sec"
pmieconf>
5. Disable all of the rules except for the **memory.swap_low** rule so that we can see the effects of the change in isolation.
This produces a relatively simple **pmie** configuration file:
.. code-block:: bash
pmieconf> disable all
pmieconf> enable memory.swap_low
pmieconf> status
verbose: off
enabled rules: 1 of 35
pmie configuration file: ${PCP_SYSCONF_DIR}/pmie/config.demo
pmie processes (PIDs) using this file: (none found)
pmieconf> quit
.. note::
We can also use the **status** command to verify that only one rule is enabled at the end of this step.
6. Run **pmie** with the new configuration file. Use a text editor to view the newly generated **pmie** configuration file (``${PCP_SYSCONF_DIR}/pmie/config.demo``), and then run the command:
.. code-block:: bash
pmie -T "1.5 sec" -v -l ${HOME}/demo.log ${PCP_SYSCONF_DIR}/pmie/config.demo
memory.swap_low: false
memory.swap_low: false
cat ${HOME}/demo.log
Log for pmie on venus started Mon Jun 21 16:26:06 2012
pmie: PID = 21847, default host = venus
[Mon Jun 21 16:26:07] pmie(21847) Info: evaluator exiting
Log finished Mon Jun 21 16:26:07 2012
7. Notice that both of the **pmieconf** files used in the previous step are simple text files, as described in the **pmieconf(5)** man page:
.. code-block:: bash
file ${PCP_SYSCONF_DIR}/pmie/config.demo
${PCP_SYSCONF_DIR}/pmie/config.demo: PCP pmie config (V.1)
file ${PCP_VAR_DIR}/config/pmieconf/memory/swap_low
${PCP_VAR_DIR}/config/pmieconf/memory/swap_low: PCP pmieconf rules (V.1)
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