Administrative

group DCGMAPI_Admin

This chapter describes the administration interfaces for DCGM.

It is the user’s responsibility to call dcgmInit() before calling any other methods, and dcgmShutdown() once DCGM is no longer being used. The APIs in Administrative module can be broken down into following categories:

Init and Shutdown

group DCGMAPI_Admin_InitShut

Describes APIs to Initialize and Shutdown the DCGM Engine.

Functions

dcgmReturn_t dcgmInit(void)

This method is used to initialize DCGM within this process.

This must be called before dcgmStartEmbedded() or dcgmConnect()

Returns

• DCGM_ST_OK if DCGM has been properly initialized

• DCGM_ST_INIT_ERROR if there was an error initializing the library

dcgmReturn_t dcgmShutdown(void)

This method is used to shut down DCGM.

Any embedded host engines or remote connections will automatically be shut down as well.

Returns

• DCGM_ST_OK if DCGM has been properly shut down

• DCGM_ST_UNINITIALIZED if the library was not shut down properly

dcgmReturn_t dcgmStartEmbedded(dcgmOperationMode_t opMode, dcgmHandle_t *pDcgmHandle)

Start an embedded host engine agent within this process.

The agent is loaded as a shared library. This mode is provided to avoid any extra jitter associated with an additional autonomous agent needs to be managed. In this mode, the user has to periodically call APIs such as dcgmPolicyTrigger and dcgmUpdateAllFields which tells DCGM to wake up and perform data collection and operations needed for policy management.

Parameters

• opMode – IN: Collect data automatically or manually when asked by the user.

• pDcgmHandle – OUT: DCGM Handle to use for API calls

Returns

• DCGM_ST_OK if DCGM was started successfully within our process

• DCGM_ST_UNINITIALIZED if DCGM has not been initialized with dcgmInit yet

dcgmReturn_t dcgmStartEmbedded_v2(dcgmStartEmbeddedV2Params_v1 *params)

Start an embedded host engine agent within this process.

The agent is loaded as a shared library. This mode is provided to avoid any extra jitter associated with an additional autonomous agent needs to be managed. In this mode, the user has to periodically call APIs such as dcgmPolicyTrigger and dcgmUpdateAllFields which tells DCGM to wake up and perform data collection and operations needed for policy management.

See also

dcgmStartEmbeddedV2Params_v1

See also

dcgmStartEmbeddedV2Params_v2

Note

This function has a versioned argument that can be actually called with two different types. The behavior will depend on the params->version value.

Parameters

params – [inout] A pointer to either dcgmStartEmbeddedV2Params_v1 or dcgmStartEmbeddedV2Params_v2.

Returns

DCGM_ST_OK if DCGM was started successfully within our process

Returns

DCGM_ST_UNINITIALIZED if DCGM has not been initialized with dcgmInit yet

dcgmReturn_t dcgmStopEmbedded(dcgmHandle_t pDcgmHandle)

Stop the embedded host engine within this process that was started with dcgmStartEmbedded.

Parameters

pDcgmHandle – IN : DCGM Handle of the embedded host engine that came from dcgmStartEmbedded

Returns

• DCGM_ST_OK if DCGM was stopped successfully within our process

• DCGM_ST_UNINITIALIZED if DCGM has not been initialized with dcgmInit or the embedded host engine was not running.

• DCGM_ST_BADPARAM if an invalid parameter was provided

• DCGM_ST_INIT_ERROR if an error occurred while trying to start the host engine.

dcgmReturn_t dcgmConnect(char *ipAddress, dcgmHandle_t *pDcgmHandle)

This method is used to connect to a stand-alone host engine process.

Remote host engines are started by running the nv-hostengine command.

NOTE: dcgmConnect_v2 provides additional connection options.

Parameters

• ipAddress – IN: Valid IP address for the remote host engine to connect to. If ipAddress is specified as x.x.x.x it will attempt to connect to the default port specified by DCGM_HE_PORT_NUMBER If ipAddress is specified as x.x.x.x:yyyy it will attempt to connect to the port specified by yyyy

• pDcgmHandle – OUT: DCGM Handle of the remote host engine

Returns

• DCGM_ST_OK if we successfully connected to the remote host engine

• DCGM_ST_CONNECTION_NOT_VALID if the remote host engine could not be reached

• DCGM_ST_UNINITIALIZED if DCGM has not been initialized with dcgmInit.

• DCGM_ST_BADPARAM if pDcgmHandle is NULL or ipAddress is invalid

• DCGM_ST_INIT_ERROR if DCGM encountered an error while initializing the remote client library

• DCGM_ST_UNINITIALIZED if DCGM has not been initialized with dcgmInit

dcgmReturn_t dcgmConnect_v2(const char *ipAddress, dcgmConnectV2Params_t *connectParams, dcgmHandle_t *pDcgmHandle)

This method is used to connect to a stand-alone host engine process.

Remote host engines are started by running the nv-hostengine command.

Parameters

• ipAddress – IN: Valid IP address for the remote host engine to connect to. If ipAddress is specified as x.x.x.x it will attempt to connect to the default port specified by DCGM_HE_PORT_NUMBER. If ipAddress is specified as x.x.x.x:yyyy it will attempt to connect to the port specified by yyyy

• connectParams – IN: Additional connection parameters. See dcgmConnectV2Params_t for details.

• pDcgmHandle – OUT: DCGM Handle of the remote host engine

Returns

• DCGM_ST_OK if we successfully connected to the remote host engine

• DCGM_ST_CONNECTION_NOT_VALID if the remote host engine could not be reached

• DCGM_ST_UNINITIALIZED if DCGM has not been initialized with dcgmInit.

• DCGM_ST_BADPARAM if pDcgmHandle is NULL or ipAddress is invalid

• DCGM_ST_INIT_ERROR if DCGM encountered an error while initializing the remote client library

• DCGM_ST_UNINITIALIZED if DCGM has not been initialized with dcgmInit

dcgmReturn_t dcgmDisconnect(dcgmHandle_t pDcgmHandle)

This method is used to disconnect from a stand-alone host engine process.

Parameters

pDcgmHandle – IN: DCGM Handle that came from dcgmConnect

Returns

• DCGM_ST_OK if we successfully disconnected from the host engine

• DCGM_ST_UNINITIALIZED if DCGM has not been initialized with dcgmInit

• DCGM_ST_BADPARAM if pDcgmHandle is not a valid DCGM handle

• DCGM_ST_GENERIC_ERROR if an unspecified internal error occurred

Auxilary information about DCGM engine

group DCGMAPI_Admin_Info

Describes APIs to get generic information about the DCGM Engine.

Functions

dcgmReturn_t dcgmVersionInfo(dcgmVersionInfo_t *pVersionInfo)

This method is used to return information about the build environment where DCGM was built.

Parameters

pVersionInfo – OUT: Build environment information

Returns

• DCGM_ST_OK if build information is sucessfully obtained

• DCGM_ST_BADPARAM if pVersionInfo is null

• DCGM_ST_VER_MISMATCH if the expected and provided versions of dcgmVersionInfo_t do not match

dcgmReturn_t dcgmHostengineVersionInfo(dcgmHandle_t pDcgmHandle, dcgmVersionInfo_t *pVersionInfo)

This method is used to return information about the build environment of the hostengine.

Parameters

• pDcgmHandle – IN: DCGM Handle that came from dcgmConnect

• pVersionInfo – OUT: Build environment information

Returns

• DCGM_ST_OK if build information is sucessfully obtained

• DCGM_ST_BADPARAM if pVersionInfo is null

• DCGM_ST_VER_MISMATCH if the expected and provided versions of dcgmVersionInfo_t do not match

dcgmReturn_t dcgmHostengineSetLoggingSeverity(dcgmHandle_t pDcgmHandle, dcgmSettingsSetLoggingSeverity_t *logging)

This method is used to set the logging severity on HostEngine for the specified logger.

Parameters

• pDcgmHandle – IN: DCGM Handle

• logging – IN: dcgmSettingsSetLoggingSeverity_t struct containing the target logger and severity

Returns

• DCGM_ST_OK Severity successfuly set

• DCGM_ST_BADPARAM Bad logger/severity string

• DCGM_ST_VER_MISMATCH if the expected and provided versions of dcgmSettingsSetLoggingSeverity_t do not match

dcgmReturn_t dcgmHostengineIsHealthy(dcgmHandle_t pDcgmHandle, dcgmHostengineHealth_t *heHealth)

This function is used to return whether or not the host engine considers itself healthy.

Parameters

• pDcgmHandle – [in] - the handle to DCGM

• heHealth – [out] - struct describing the health of the hostengine. if heHealth.hostengineHealth is 0, then the hostengine is healthy. Non-zero indicates not healthy with error codes determining the cause.

Returns

• DCGM_ST_OK Able to gauge health

• DCGM_ST_BADPARAM isHealthy is not a valid pointer

const char *errorString(dcgmReturn_t result)

This function describes DCGM error codes in human readable form.

Parameters

result – [in] - DCGM return code to describe

Returns

• Human readable string with the DCGM error code description if the code is valid.

• nullptr if there is not such error code

dcgmReturn_t dcgmModuleIdToName(dcgmModuleId_t id, char const **name)

This function describes DCGM Module by given Module ID.

Parameters

• id[in] – - Module ID to name.

• name[out] – - Module name will be provided via this argument.

Returns

• DCGM_ST_OK Module name has valid value

• DCGM_ST_BADPARAM There is no module with specified ID. Name value is not changed.