Serhiy Storchaka added the comment:
It can be significantly sped up if replace the writing loop with
if size:
os.lseek(self.fd, size, 0)
os.write(self.fd, b'')
os.lseek(self.fd, 0, 0)
or just with
os.truncate(self.fd, size)
(not sure the latter always works).
But instantiating an open Arena will still be slower than in 2.7.
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<http://bugs.python.org/issue30919>
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