Module sys 

Host-system probes: hostname, OS user, VRAM.

Every probe emits a structured tracing breadcrumb so an operator can tell from the logs why a worker reports the values it does (in particular, why VRAM came back as 0.0 — was the sysfs tree missing, present-but-unparseable, or is the worker running on a non-Linux host?). Silent 0.0 makes “this worker claims nothing” impossible to diagnose from logs alone.

Functions

detect_vram_gb

Detect physical VRAM on the host, in GB. Returns 0.0 when we can’t probe (no NVIDIA GPU, no driver) — the engine still runs in synthetic mode for low-end / CI machines.

detect_vram_gb_from_sysfs

VRAM probe driven by a configurable sysfs root. Public-in-crate so the integration tests can exercise both the “missing root” and “populated root” branches without a real /proc/driver/nvidia tree.

machine_name

username