Error message when GPU model do not support power retrieval

[lfwa]

Some models of NVIDIA GPUs do not support the retrieval of power usages in NVML. These errors are currently suppressed and power usage retrieval is skipped.

It should instead throw a descriptive error when the GPU model does not support power retrieval (see power_usage() in nvidia.py).

See e.g. error by Princec711 when running this code snippet:

import pynvml

pynvml.nvmlInit()

device_indices = range(pynvml.nvmlDeviceGetCount())
handles = [pynvml.nvmlDeviceGetHandleByIndex(i) for i in device_indices]

for handle in handles:
    name = pynvml.nvmlDeviceGetName(handle)
    device = name.decode("utf-8")
    power_usage = pynvml.nvmlDeviceGetPowerUsage(handle) / 1000
    print(f"{device} uses {power_usage} W")

pynvml.nvmlShutdown()

---------------------------------------------------------------------------
NVMLError_NotSupported                    Traceback (most recent call last)
<ipython-input-2-7e19c443106e> in <module>
      9     name = pynvml.nvmlDeviceGetName(handle)
     10     device = name.decode("utf-8")
---> 11     power_usage = pynvml.nvmlDeviceGetPowerUsage(handle) / 1000
     12     print(f"{device} uses {power_usage} W")
     13 

C:\ProgramData\Anaconda3\lib\site-packages\pynvml\nvml.py in nvmlDeviceGetPowerUsage(handle)
   1243     fn = get_func_pointer("nvmlDeviceGetPowerUsage")
   1244     ret = fn(handle, byref(c_mWatts))
-> 1245     check_return(ret)
   1246     return c_mWatts.value
   1247 

C:\ProgramData\Anaconda3\lib\site-packages\pynvml\nvml.py in check_return(ret)
    364 def check_return(ret):
    365     if (ret != NVML_SUCCESS):
--> 366         raise NVMLError(ret)
    367     return ret
    368 

NVMLError_NotSupported: Not Supported

Originally posted by @Princec711 in #33 (comment)

[PedramBakh]

Release 1.1.7 addresses this issue by informing the user of missing support for power usage retrieval through the NVML API and refers the user to this issue thread.