46 lines
1.0 KiB
Python
46 lines
1.0 KiB
Python
"""
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Linux 3.6, O_CLOEXEC:
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open(cloexec=False) + close(): 7.76 us per call
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open(cloexec=True) + close(): 7.87 us per call
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=> 1% slower
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Linux 3.6, ioctl(FIOCLEX):
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open(cloexec=False) + close(): 7.77 us per call
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open(cloexec=True) + close(): 8.02 us per call
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=> 3% slower
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Linux 3.6, fnctl(F_GETFD) + fnctl(F_SETFD):
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open(cloexec=False) + close(): 7.77 us per call
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open(cloexec=True) + close(): 8.01 us per call
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=> 3% slower
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"""
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import os, time
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name = __file__
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LOOPS = 10**5
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RUNS = 5
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for cloexec in (False, True):
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best = None
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for run in range(RUNS):
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print("cloexec", cloexec, "run", run)
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time.sleep(1)
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start = time.perf_counter()
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for loops in range(LOOPS):
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fd = os.open(name, os.O_RDONLY, cloexec=cloexec)
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os.close(fd)
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dt = time.perf_counter() - start
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if best is not None:
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best = min(best, dt)
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else:
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best = dt
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seconds = best / LOOPS
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print("open(cloexec=%s) + close(): %.2f us per call" % (cloexec, seconds * 1e6))
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