[Bug] unitrace -q produces no metrics unless the result is printed

[NaOHCC]

unitrace -q does not produce hardware metrics report for a simple PyTorch XPU workload unless the result is printed.

Environment

• OS: Ubuntu 24.04
• Driver: 64290D8E349F41730D761F4
• Level Zero: 1.28.6
• Device: Intel(R) Arc(TM) Pro B70 Graphics
• PyTorch: 2.13.0+xpu
• pti-gpu commit: c71e8316e19bb5316157b9046d877b5eff0e262c
• unitrace version: 2.4.0 (c71e8316e19bb5316157b9046d877b5eff0e262c)
• intel-metrics-discovery: 1.14.188
• intel-metrics-library: 1.0.231

Reproducer

import torch

x = torch.rand(1024, 1024, device="xpu")
z = x @ x

# Uncommenting this line makes unitrace produce metrics:
# print(z)

Run:

. /opt/intel/oneapi/setvars.sh
unitrace -q python mm.py

Actual behavior

Without the print statement, the command exits successfully but print only Device Timing Summary section. It does not print Device #x Metrics, e.g.

=== Device Timing Summary ===

                Total Execution Time (ns):           1153914201

After uncommenting print(z) the same command produces populated device timing and hardware metrics.