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README - Using the PEGASUS CIMSERVER STATISTICS

Author: Karl Schopmeyer <k.schopmeyer@opengroup.org>

Date: 14 March 2006

The OpenPegasus CIMServer provides for gathering statistics on the CIM

operations executed by the server based on the CIM_CIMOMStatisticalData class

defined in the DMTF CIM_Interop model.

Statistics are gathered on all CIM Operations executed by the server when the

statistics are enabled.

When the statistics are enabled, the server gathers times and request and

response counts on each operation executed and maintains these counts and times

from the time the statistics were started. For each operation executed the

following are gathered.

* request size

* response size

* time spent in the server

* time spent in the providers

For each operation type defined (ex getclass, etc.) an instance of the

CIM_CIMOMStatisticalData class provides the following properties:

* OperationType Enum (Value/Valuemap) defining the CIM operation

type.

* NumberOfOperations - Number of operations executed for this

OperationType since the server was started or the statistics were

turned on whichever occurred later.

* CimomElapsedTime - Total time spent in the CIMServer for this

operation in microseconds. This does not include time spent in the

providers. That is defined by the ProviderResponseTime. This includes

http processing, authentication, xml parsing and validation, routing,

etc time that is common to all requests.

* ProviderElapsedTime - Total time spent in the targeted providers for

this operation. Note that for class and qualifier operations (ex.

getclass) this is the time spent in the Pegasus Class repository.

Further, if repository requests (ex getclass) are required in the

server infrastructure to process an operation, that time is included as

part of the server time, not provider time. The goal of providing this

number is to measure times in the providers that are the support for

the class(s) that represent the target of this operation.

* RequestSize - Total size of the requests for this operation type in

bytes.

* ResponseSize - Total size of the responses for this operation type in

bytes.

At any time, the statistics gathered by an OpenPegasus CIMServer can be

requested by a CIM client by enumerating the instances of the

CIM_CIMOMStatisticalData class from a client to the Pegasus server in the

PG/Interop namespace. Note that there is no reset of statistics. They are

continuously gathered and accumulated and, the counts wrap when they exceed the

size of the property.

The client tool (cimperf) reports on averages for the times and byte sizes from

the totals provided by the CIM_CIMOMStatisticalData instances.

ENABLING AND DISABLING STATISTICS GATHERING

The statistics are normally disabled when the server environment is compiled.

The enabled/disabled status of statistics gathering is controlled through a

property in the CIM_ObjectManager instance (GatherStatisticalData) maintained

by the server and persisted through the life of the instance repository.

The test client CLI includes a special set of operations (son and soff) that

directly set the GatherStatisticalData property true or false effectively

enabling/disabling statistics gathering.

ex. CLI son - turns the statistics gathering on. CLI soff

- turns the statistics gathering off.

Once statistics gathering is enabled or disabled this state is maintained

through cimserver or system restarts until either changed again or if the

repository is removed or the instance of the CIM_ObjectManager class is reset

or removed.

The cimserver does not maintain gathered statistics information if the erver is

stopped. Each startup of the server restarts all statistics counts from zero.

Disabling the statistics gathering also causes all of the statistics counts to

be reset to zero in the server.

CLIENT OPERATIONS STATISTICS REPORTING

In addition to the statistics reported through the CIM_CIMOMStatisticalData the

OpenPegasus server is capable of reporting operation execution time to the

client as part of each operation executed. This function also is only active

when the statistics gathering capability has been enabled. The passage of this

information is defined in the DMTF CIMOperations specification (Version 1.2,

3.3.16. WBEMServerResponseTime). Within the OpenPegasus Client API there is a

specific operation to request this information as part of each CIM operation.

This reports the total time spent in the CIMServer (server plus providers) for

the last operation executed. As an example, this is implemented in CLI.

LIMITATIONS

Currently no statistics are maintained on indications processed. Provision is

made in the DMTF CIM_CIMOMStatisticalData class for gathering of indication

statistics but the exact form of the information is in question because this

differs from operations so this has not been implemented to date.

The client statistics test tool cimperf only prints out the current statistics

each time it is executed. There are no client tools in the current pegasus

environment to maintain statistics history, show trends, etc.

If statistics are disabled, the statistics instances will still be output by

the cimserver but will show zero for all values.

There are no automated tests today for the numbers accumulated by the

statistics gathering components. The validity of the numbers produced in the

CIM_CIMOMStatisticalData instances has been verified by manual inspection

However, Currently there are no automated test to programatically verify the

statistics are correct.

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