Known Issues

Known Issues#

Warning

DRAFT DOCUMENTATION - This documentation is currently in draft status and subject to change.

  1. Metrics collection (ptiMetrics and ptiMetricsScope APIs) requires the ZET_ENABLE_METRICS=1 environment variable to be set.

  2. Communication tracing (PTI_VIEW_COMMUNICATION) requires the INTEL_LIBITTNOTIFY64 environment variable to be set, pointing to the pti_view library path. Without this, communication tracing will not be enabled.

  3. Significant CPU overhead is currently observed when tracing workloads that frequently submit short kernels to the GPU. Optimization efforts continue both in the library as well as in the underlying layers of the software stack.

  4. For on-demand collection mode, Rolling drivers are required. Older LTS drivers do not support it, and instead require Level Zero tracing to be globally enabled via the ZE_ENABLE_TRACING_LAYER=1 environment variable.

  5. Kernel name demangling is not supported on Windows.