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nvmlUnitQueries(3)

Version 1.1
8 Feb 2019
Aliases: nvmlSystemGetHicVersion(3), nvmlSystemGetHicVersion(3), nvmlUnitGetCount(3), nvmlUnitGetCount(3), nvmlUnitGetDevices(3), nvmlUnitGetDevices(3), nvmlUnitGetFanSpeedInfo(3), nvmlUnitGetFanSpeedInfo(3), nvmlUnitGetHandleByIndex(3), nvmlUnitGetHandleByIndex(3), nvmlUnitGetLedState(3), nvmlUnitGetLedState(3), nvmlUnitGetPsuInfo(3), nvmlUnitGetPsuInfo(3), nvmlUnitGetTemperature(3), nvmlUnitGetTemperature(3), nvmlUnitGetUnitInfo(3), nvmlUnitGetUnitInfo(3)

nvidia-cuda-dev

NVIDIA CUDA development files

cuda

NVIDIA's GPU programming toolkit

NAME

Unit Queries -

Functions

nvmlReturn_t DECLDIR nvmlUnitGetCount (unsigned int *unitCount)
nvmlReturn_t DECLDIR nvmlUnitGetHandleByIndex (unsigned int index, nvmlUnit_t *unit)
nvmlReturn_t DECLDIR nvmlUnitGetUnitInfo (nvmlUnit_t unit, nvmlUnitInfo_t *info)
nvmlReturn_t DECLDIR nvmlUnitGetLedState (nvmlUnit_t unit, nvmlLedState_t *state)
nvmlReturn_t DECLDIR nvmlUnitGetPsuInfo (nvmlUnit_t unit, nvmlPSUInfo_t *psu)
nvmlReturn_t DECLDIR nvmlUnitGetTemperature (nvmlUnit_t unit, unsigned int type, unsigned int *temp)
nvmlReturn_t DECLDIR nvmlUnitGetFanSpeedInfo (nvmlUnit_t unit, nvmlUnitFanSpeeds_t *fanSpeeds)
nvmlReturn_t DECLDIR nvmlUnitGetDevices (nvmlUnit_t unit, unsigned int *deviceCount, nvmlDevice_t *devices)
nvmlReturn_t DECLDIR nvmlSystemGetHicVersion (unsigned int *hwbcCount, nvmlHwbcEntry_t *hwbcEntries)

Detailed Description

This chapter describes that queries that NVML can perform against each unit. For S-class systems only. In each case the device is identified with an nvmlUnit_t handle. This handle is obtained by calling nvmlUnitGetHandleByIndex().

Function Documentation

nvmlReturn_t DECLDIR nvmlSystemGetHicVersion (unsigned int * hwbcCount, nvmlHwbcEntry_t * hwbcEntries)

Retrieves the IDs and firmware versions for any Host Interface Cards (HICs) in the system.
For S-class products.
The hwbcCount argument is expected to be set to the size of the input hwbcEntries array. The HIC must be connected to an S-class system for it to be reported by this function.
Parameters:
hwbcCount Size of hwbcEntries array
hwbcEntries Array holding information about hwbc
Returns:
o NVML_SUCCESS if hwbcCount and hwbcEntries have been populated
o NVML_ERROR_UNINITIALIZED if the library has not been successfully initialized
o NVML_ERROR_INVALID_ARGUMENT if either hwbcCount or hwbcEntries is NULL
o NVML_ERROR_INSUFFICIENT_SIZE if hwbcCount indicates that the hwbcEntries array is too small

nvmlReturn_t DECLDIR nvmlUnitGetCount (unsigned int * unitCount)

Retrieves the number of units in the system.
For S-class products.
Parameters:
unitCount Reference in which to return the number of units
Returns:
o NVML_SUCCESS if unitCount has been set
o NVML_ERROR_UNINITIALIZED if the library has not been successfully initialized
o NVML_ERROR_INVALID_ARGUMENT if unitCount is NULL
o NVML_ERROR_UNKNOWN on any unexpected error

nvmlReturn_t DECLDIR nvmlUnitGetDevices (nvmlUnit_t unit, unsigned int * deviceCount, nvmlDevice_t * devices)

Retrieves the set of GPU devices that are attached to the specified unit.
For S-class products.
The deviceCount argument is expected to be set to the size of the input devices array.
Parameters:
unit The identifier of the target unit
deviceCount Reference in which to provide the devices array size, and to return the number of attached GPU devices
devices Reference in which to return the references to the attached GPU devices
Returns:
o NVML_SUCCESS if deviceCount and devices have been populated
o NVML_ERROR_UNINITIALIZED if the library has not been successfully initialized
o NVML_ERROR_INSUFFICIENT_SIZE if deviceCount indicates that the devices array is too small
o NVML_ERROR_INVALID_ARGUMENT if unit is invalid, either of deviceCount or devices is NULL
o NVML_ERROR_UNKNOWN on any unexpected error

nvmlReturn_t DECLDIR nvmlUnitGetFanSpeedInfo (nvmlUnit_t unit, nvmlUnitFanSpeeds_t * fanSpeeds)

Retrieves the fan speed readings for the unit.
For S-class products.
See nvmlUnitFanSpeeds_t for details on available fan speed info.
Parameters:
unit The identifier of the target unit
fanSpeeds Reference in which to return the fan speed information
Returns:
o NVML_SUCCESS if fanSpeeds has been populated
o NVML_ERROR_UNINITIALIZED if the library has not been successfully initialized
o NVML_ERROR_INVALID_ARGUMENT if unit is invalid or fanSpeeds is NULL
o NVML_ERROR_NOT_SUPPORTED if this is not an S-class product
o NVML_ERROR_UNKNOWN on any unexpected error

nvmlReturn_t DECLDIR nvmlUnitGetHandleByIndex (unsigned int index, nvmlUnit_t * unit)

Acquire the handle for a particular unit, based on its index.
For S-class products.
Valid indices are derived from the unitCount returned by nvmlUnitGetCount(). For example, if unitCount is 2 the valid indices are 0 and 1, corresponding to UNIT 0 and UNIT 1.
The order in which NVML enumerates units has no guarantees of consistency between reboots.
Parameters:
index The index of the target unit, >= 0 and < unitCount
unit Reference in which to return the unit handle
Returns:
o NVML_SUCCESS if unit has been set
o NVML_ERROR_UNINITIALIZED if the library has not been successfully initialized
o NVML_ERROR_INVALID_ARGUMENT if index is invalid or unit is NULL
o NVML_ERROR_UNKNOWN on any unexpected error

nvmlReturn_t DECLDIR nvmlUnitGetLedState (nvmlUnit_t unit, nvmlLedState_t * state)

Retrieves the LED state associated with this unit.
For S-class products.
See nvmlLedState_t for details on allowed states.
Parameters:
unit The identifier of the target unit
state Reference in which to return the current LED state
Returns:
o NVML_SUCCESS if state has been set
o NVML_ERROR_UNINITIALIZED if the library has not been successfully initialized
o NVML_ERROR_INVALID_ARGUMENT if unit is invalid or state is NULL
o NVML_ERROR_NOT_SUPPORTED if this is not an S-class product
o NVML_ERROR_UNKNOWN on any unexpected error
See also:
nvmlUnitSetLedState()

nvmlReturn_t DECLDIR nvmlUnitGetPsuInfo (nvmlUnit_t unit, nvmlPSUInfo_t * psu)

Retrieves the PSU stats for the unit.
For S-class products.
See nvmlPSUInfo_t for details on available PSU info.
Parameters:
unit The identifier of the target unit
psu Reference in which to return the PSU information
Returns:
o NVML_SUCCESS if psu has been populated
o NVML_ERROR_UNINITIALIZED if the library has not been successfully initialized
o NVML_ERROR_INVALID_ARGUMENT if unit is invalid or psu is NULL
o NVML_ERROR_NOT_SUPPORTED if this is not an S-class product
o NVML_ERROR_UNKNOWN on any unexpected error

nvmlReturn_t DECLDIR nvmlUnitGetTemperature (nvmlUnit_t unit, unsigned int type, unsigned int * temp)

Retrieves the temperature readings for the unit, in degrees C.
For S-class products.
Depending on the product, readings may be available for intake (type=0), exhaust (type=1) and board (type=2).
Parameters:
unit The identifier of the target unit
type The type of reading to take
temp Reference in which to return the intake temperature
Returns:
o NVML_SUCCESS if temp has been populated
o NVML_ERROR_UNINITIALIZED if the library has not been successfully initialized
o NVML_ERROR_INVALID_ARGUMENT if unit or type is invalid or temp is NULL
o NVML_ERROR_NOT_SUPPORTED if this is not an S-class product
o NVML_ERROR_UNKNOWN on any unexpected error

nvmlReturn_t DECLDIR nvmlUnitGetUnitInfo (nvmlUnit_t unit, nvmlUnitInfo_t * info)

Retrieves the static information associated with a unit.
For S-class products.
See nvmlUnitInfo_t for details on available unit info.
Parameters:
unit The identifier of the target unit
info Reference in which to return the unit information
Returns:
o NVML_SUCCESS if info has been populated
o NVML_ERROR_UNINITIALIZED if the library has not been successfully initialized
o NVML_ERROR_INVALID_ARGUMENT if unit is invalid or info is NULL

Author

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