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Add env var to shut down kernel immediately after start for benchmarking #1542

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Add env var to shut down kernel immediately after start for benchmarking #1542

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4 changes: 4 additions & 0 deletions ipykernel/kernelapp.py
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Original file line number Diff line number Diff line change
Expand Up @@ -755,6 +755,10 @@ def start(self):
self.poller.start()
self.kernel.start()
self.io_loop = ioloop.IOLoop.current()
if os.environ.get("IPYKERNEL_BENCHMARK_STARTUP_SHUTDOWN"):
# Shut down immediately after entering the event loop, for
# benchmarking kernel startup time end-to-end.
self.io_loop.add_callback(self.io_loop.stop)
if self.trio_loop:
from ipykernel.trio_runner import TrioRunner

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