[Question] How snapshot could be used

[Xiang-cd]

Required prerequisites

• [X] I have read the documentation https://nvitop.readthedocs.io.
• [X] I have searched the Issue Tracker that this hasn't already been reported. (comment there if it has.)
• [ ] I have tried the latest version of nvitop in a new isolated virtual environment.

Questions

thank you for your great work! I've seen the as_snapshot function, but I was wondering how the snapshot could be used? is the snapshot resumable? because I didn't see the resume interface.

[XuehaiPan]

@Xiang-cd Thanks for raising this.

The Device / GpuProcess instance is live object to get the latest metrics via method calls. E.g.:

device = Device(0)

device.gpu_utilization()  # -> 96
time.sleep(1)
device.gpu_utilization()  # -> 80  # the latest value from a new NVML API call

Once it is converted to snapshot, the metrics are forzen. The metrcis values are obtained at the time you call as_snapshot().

device = Device(0)

snapshot = device.as_snapshot()
snapshot.gpu_utilization  # -> 94
time.sleep(1)
snapshot.gpu_utilization  # -> 94 (always the freezed value)

You can access the device object via:

snapshot = device.as_snapshot()

snapshot.real  # -> Device(...)

# Get a new snapshot
snapshot = snapshot.real.as_snapshot()
# or
snapshot = device.as_snapshot()

[Xiang-cd]

thank you, so the snapshot is not a context containing all memory content and register status that could move all context of one device to another device?