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wookayin avatar wookayin commented on June 18, 2024

So in this case, nvidia drivers cannot be found (although it exists?) for some reasons, gpustat saying Error on querying NVIDIA devices. Use --debug flag for details and nvidia-smi says an error as well. I think the both programs are working as expected (raising and printing errors) --- what do you expect for gpustat to behave in this scenario?

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mattip avatar mattip commented on June 18, 2024

This depends on how you view the purpose of the program. Since in practice the result is that the user cannot use a graphics card, I would personally expect gpustat to behave as if it could not find a graphics card rather than an error. That way a consumer of gpustat like ray would not need to use an error catching mechanism to differentiate between "no available graphics card for the user" and "some internal problem with gpustat that is unexpected".

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wookayin avatar wookayin commented on June 18, 2024

I see; yes, we can definitely improve the error message depending on the type of error being thrown from nvmlInit().

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wookayin avatar wookayin commented on June 18, 2024

With 175c34b (in 1.1.dev), I think gpustat will print the exception messages being thrown. For instance,

Error on querying NVIDIA devices. Use --debug flag to see more details.
Insufficient Permissions

Error on querying NVIDIA devices. Use --debug flag to see more details.
Driver Not Loaded

@mattip Would that suffice for you?

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XuehaiPan avatar XuehaiPan commented on June 18, 2024

@wookayin. I think @mattip's usage is about Python integration than the command line tool. @mattip may want an extra flag for GPUStatCollection.new_query to return an empty collection if any NVML-related error raises.

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mattip avatar mattip commented on June 18, 2024

extra flag for GPUStatCollection.new_query to return an empty collection

+1 that would be great if possible. 175c34b is already a nice improvement.

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wookayin avatar wookayin commented on June 18, 2024

I don't think gpustat.new_query() should return an empty collection when error happens from the NVML side. This is a clear case where "exception" or "error" happens. Although not explicitly documented and we don't have exception translations, NVMLError (or its subclass) will be thrown when NVML-related error occurs while querying NVIDIA devices.

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XuehaiPan avatar XuehaiPan commented on June 18, 2024

I don't think gpustat.new_query() should return an empty collection when error happens from the NVML side.

Then, how about new test functions such as is_available() and device_count() (or gpu_count())? They should return False or 0 if an NVML-related error occurs rather than raise. Test functions that silently fail, which reduce try-except blocks and improve code readability. I also added similar functions in my nvitop: nvitop.Device.is_available(). It would be great to have similar things in gpustat.

Most mainstream ML frameworks provide those test functions for users so that they can test the GPU availability in the first place. For example:

❯ export CUDA_VISIBLE_DEVICES=''

❯ ipython3
Python 3.10.8 (main, Oct 11 2022, 11:35:05) [GCC 11.2.0]
Type 'copyright', 'credits' or 'license' for more information
IPython 8.7.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import torch

In [2]: torch.cuda.is_available()
Out[2]: False

In [3]: torch.cuda.device_count()
Out[3]: 0

In [4]: import tensorflow as tf
2022-12-03 05:10:48.804143: I tensorflow/core/platform/cpu_feature_guard.cc:193] This TensorFlow binary is optimized with oneAPI Deep Neural Network Library (oneDNN) to use the following CPU instructions in performance-critical operations:  AVX2 FMA
To enable them in other operations, rebuild TensorFlow with the appropriate compiler flags.
2022-12-03 05:10:49.453942: W tensorflow/compiler/xla/stream_executor/platform/default/dso_loader.cc:64] Could not load dynamic library 'libnvinfer.so.7'; dlerror: libnvinfer.so.7: cannot open shared object file: No such file or directory; LD_LIBRARY_PATH: /home/PanXuehai/.mujoco/mujoco210/bin:/usr/local/cuda/lib64:/usr/local/cuda/extras/CUPTI/lib64:/home/PanXuehai/.local/lib
2022-12-03 05:10:49.454000: W tensorflow/compiler/xla/stream_executor/platform/default/dso_loader.cc:64] Could not load dynamic library 'libnvinfer_plugin.so.7'; dlerror: libnvinfer_plugin.so.7: cannot open shared object file: No such file or directory; LD_LIBRARY_PATH: /home/PanXuehai/.mujoco/mujoco210/bin:/usr/local/cuda/lib64:/usr/local/cuda/extras/CUPTI/lib64:/home/PanXuehai/.local/lib
2022-12-03 05:10:49.454008: W tensorflow/compiler/tf2tensorrt/utils/py_utils.cc:38] TF-TRT Warning: Cannot dlopen some TensorRT libraries. If you would like to use Nvidia GPU with TensorRT, please make sure the missing libraries mentioned above are installed properly.

In [5]: tf.config.list_physical_devices('GPU')
2022-12-03 05:10:57.811047: E tensorflow/compiler/xla/stream_executor/cuda/cuda_driver.cc:267] failed call to cuInit: CUDA_ERROR_NO_DEVICE: no CUDA-capable device is detected
2022-12-03 05:10:57.811074: I tensorflow/compiler/xla/stream_executor/cuda/cuda_diagnostics.cc:169] retrieving CUDA diagnostic information for host: Precision-3630-Tower
2022-12-03 05:10:57.811081: I tensorflow/compiler/xla/stream_executor/cuda/cuda_diagnostics.cc:176] hostname: Precision-3630-Tower
2022-12-03 05:10:57.811112: I tensorflow/compiler/xla/stream_executor/cuda/cuda_diagnostics.cc:200] libcuda reported version is: 520.56.6
2022-12-03 05:10:57.811133: I tensorflow/compiler/xla/stream_executor/cuda/cuda_diagnostics.cc:204] kernel reported version is: 520.56.6
2022-12-03 05:10:57.811139: I tensorflow/compiler/xla/stream_executor/cuda/cuda_diagnostics.cc:310] kernel version seems to match DSO: 520.56.6
Out[5]: []

In [6]: from nvitop import Device

In [7]: Device.all()
Out[7]: [PhysicalDevice(index=0, name="NVIDIA GeForce RTX 3060", total_memory=12288MiB)]

In [8]: Device.count()
Out[8]: 1

In [9]: Device.is_available()
Out[9]: True

In [10]: Device.cuda.all()
Out[10]: []

In [11]: Device.cuda.count()
Out[11]: 0

In [12]: Device.cuda.is_available()
Out[12]: False

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