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Install fork() warning during backend initialization, rather than jax… #20734

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merged 1 commit into from
Apr 15, 2024
Merged

Install fork() warning during backend initialization, rather than jax… #20734

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12 changes: 8 additions & 4 deletions jax/_src/xla_bridge.py
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Original file line number Diff line number Diff line change
Expand Up @@ -114,10 +114,7 @@ def _at_fork():
"and JAX is multithreaded, so this will likely lead to a deadlock.",
RuntimeWarning, stacklevel=2)

# os.register_at_fork only exists on Unix.
if hasattr(os, "register_at_fork"):
os.register_at_fork(before=_at_fork)

_at_fork_handler_installed = False

# Backends

Expand Down Expand Up @@ -824,12 +821,19 @@ def backends() -> dict[str, xla_client.Client]:
global _backends
global _backend_errors
global _default_backend
global _at_fork_handler_installed

_discover_and_register_pjrt_plugins()

with _backend_lock:
if _backends:
return _backends

# os.register_at_fork only exists on Unix.
if not _at_fork_handler_installed and hasattr(os, "register_at_fork"):
os.register_at_fork(before=_at_fork)
_at_fork_handler_installed = True

if jax_platforms := config.jax_platforms.value:
platforms = []
# Allow platform aliases in the list of platforms.
Expand Down