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bpo-45116 Add a warm-up for PGO training on Windows #28631

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bpo-45116 Add a warm-up for PGO training on Windows #28631

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ceval_warmup for windows
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@neonene
neonene authored Sep 29, 2021
commit e76930f30355b52bc282955c11dde7d2ad0faeff
23 changes: 23 additions & 0 deletions Lib/test/libregrtest/pgo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,30 @@
'test_xml_etree_c',
]

def ceval_warmup():
# MSVC needs additional ceval-loop counts for better performance.
import sys
if sys.platform != 'win32':
return

def noop_trace(frame, event, arg):
return noop_trace

print("warmup for tests on Windows...")
old_trace = sys.gettrace()
sys.settrace(noop_trace)
try:
jobcnt = len(PGO_TESTS)
for j in range(1, 1 + jobcnt):
print(f'{j}/{jobcnt}')
for i in range(800000):
pass
finally:
sys.settrace(old_trace)


def setup_pgo_tests(ns):
ceval_warmup()
if not ns.args and not ns.pgo_extended:
# run default set of tests for PGO training
ns.args = PGO_TESTS[:]