[issue30919] Shared Array Memory Allocation Regression

[Serhiy Storchaka]

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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