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Fix incorrect memory reporting on coherent UMA platforms (GB10 / DGX … #208

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Fix incorrect memory reporting on coherent UMA platforms (GB10 / DGX … #208

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de09aeb
Fix incorrect memory reporting on coherent UMA platforms (GB10 / DGX …
parallelArchitect Apr 16, 2026
2ca5797
fix: replace UMA acronym in comment to pass spell check
parallelArchitect Apr 16, 2026
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22 changes: 15 additions & 7 deletions nvitop/api/device.py
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Original file line number Diff line number Diff line change
Expand Up @@ -985,13 +985,21 @@ def memory_info(self) -> MemoryInfo: # in bytes
memory_info = NA
if libnvml.nvmlCheckReturn(memory_info):
if memory_info.total > 0:
return MemoryInfo(
total=memory_info.total,
free=memory_info.free,
used=memory_info.used,
reserved=getattr(memory_info, 'reserved', NA),
)
has_unified_memory = True
# Detect coherent unified-memory platforms (e.g. GB10 Grace Blackwell):
# nvmlDeviceGetMemoryInfo returns NVML_SUCCESS with total == system MemTotal (~121GB).
# If total >= 90% of system RAM, treat as unified memory and use MemAvailable instead.
vm = host.virtual_memory()
if vm.total > 0 and memory_info.total >= vm.total * 9 // 10:
has_unified_memory = True
else:
return MemoryInfo(
total=memory_info.total,
free=memory_info.free,
used=memory_info.used,
reserved=getattr(memory_info, 'reserved', NA),
)
else:
has_unified_memory = True
if has_unified_memory:
# Device with unified memory
# Use system virtual memory as these devices share host memory
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