Debugging Environment Variables

Created On: Feb 15, 2024 | Last Updated On: Jul 30, 2026

Variable	Description
TORCH_SHOW_CPP_STACKTRACES	If set to 1, makes PyTorch print out a stack trace when it detects a C++ error.
TORCH_CPP_LOG_LEVEL	Set the log level of c10 logging facility (supports both GLOG and c10 loggers). Valid values are INFO, WARNING, ERROR, and FATAL or their numerical equivalents 0, 1, 2, and 3.
TORCH_LOGS	For a more in depth explanation of this environment variable, see torch._logging.
TORCH_DIST_NAN_CHECK	If set to 1, checks the input (send) buffers of every torch.distributed collective for NaNs, for any backend. Unlike TORCH_NCCL_NAN_CHECK, which is implemented natively by the NCCL backend, this is driven by the backend-agnostic ProcessGroup collective hooks.