can't get `SampleValue.uiVal`
qisikai opened this issue · comments
Hello， I am back again.
I want to call this func:
func DeviceGetSamples(Device Device, _type SamplingType, LastSeenTimeStamp uint64) (ValueType, []Sample, Return) {
var SampleValType ValueType
var SampleCount uint32
ret := nvmlDeviceGetSamples(Device, _type, LastSeenTimeStamp, &SampleValType, &SampleCount, nil)
if ret != SUCCESS {
return SampleValType, nil, ret
}
if SampleCount == 0 {
return SampleValType, []Sample{}, ret
}
Samples := make([]Sample, SampleCount)
ret = nvmlDeviceGetSamples(Device, _type, LastSeenTimeStamp, &SampleValType, &SampleCount, &Samples[0])
return SampleValType, Samples, ret
}
func (Device Device) GetSamples(_type SamplingType, LastSeenTimeStamp uint64) (ValueType, []Sample, Return) {
return DeviceGetSamples(Device, _type, LastSeenTimeStamp)
}
I want to get values in Samples, which is defined as:
typedef union nvmlValue_st
{
double dVal; //!< If the value is double
unsigned int uiVal; //!< If the value is unsigned int
unsigned long ulVal; //!< If the value is unsigned long
unsigned long long ullVal; //!< If the value is unsigned long long
signed long long sllVal; //!< If the value is signed long long
}nvmlValue_t;
I tried uiVal, UiVal, UIvVal but none of them works.
Hi @qisikai ,
A Sample is defined as here:
https://github.com/NVIDIA/go-nvml/blob/master/pkg/nvml/types_gen.go#L92
Where the value embedded inside of it is of type SampleValue [8]byte.
It is defined as such, because golang doesn't support unions.
To cast this byte array to the correct type, you will need to use the ValueType returned by the GetSamples() call, as defined here: https://github.com/NVIDIA/go-nvml/blob/master/pkg/nvml/const.go#L624
From this you can construct something like:
valueType, samples, ret := device.GetSamples(...)
for _, sample := range samples {
switch valueType {
case nvml.VALUE_TYPE_DOUBLE:
var dVal float64 = *(*float64)(unsafe.Pointer(&sample.SampleValue[0]))
...
case nvml.VALUE_TYPE_UNSIGNED_INT:
var uiVal uint32 = *(*uint32)(unsafe.Pointer(&sample.SampleValue[0]))
...
case nvml. VALUE_TYPE_UNSIGNED_LONG:
var ulVal uint64 = *(*uint64)(unsafe.Pointer(&sample.SampleValue[0]))
...
case nvml. VALUE_TYPE_UNSIGNED_LONG_LONG:
var ullVal uint64 = *(*uint64)(unsafe.Pointer(&sample.SampleValue[0]))
...
case nvml. VALUE_TYPE_SIGNED_LONG_LONG:
var sllVal int64 = *(*int64)(unsafe.Pointer(&sample.SampleValue[0]))
...
}
}
It works, Thank you.
@klueska Hi, I found another case:
GetSamples always return 100 samples. And I can't distinguish the records
I solved it. by checking timestamp.
The bad record's timestamp equals to 0
hi， @klueska ， I have a question: how to get the type of a process with go-nvml.
For ex:
with nvidia-smi: nvidia-smi -q
....
Max Customer Boost Clocks
Graphics : 1590 MHz
Clock Policy
Auto Boost : N/A
Auto Boost Default : N/A
Processes
GPU instance ID : N/A
Compute instance ID : N/A
Process ID : 2298824
Type : C
Name : nvidia-cuda-mps-server
Used GPU Memory : 25 MiB
GPU instance ID : N/A
Compute instance ID : N/A
Process ID : 2302001
Type : M+C
Name : tf_serving_1_15
Used GPU Memory : 519 MiB
How can I get this value Type : M+C with go-nvml
I'm not sure what the M there is. Normally you see either C, G, or C+G.
Where C means that the process is contained in the results of:
DeviceGetComputeRunningProcesses()
And G means that the process is contained in the results of:
DeviceGetComputeRunningProcesses()
If the process is returned by both calls, a C+G would be listed.
