[Patches] [ python-Patches-1569291 ] Speed-up in array_repeat()

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Patches item #1569291, was opened at 2006-10-02 15:30
Message generated for change (Comment added) made by lskovlund
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Category: Modules
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Lars Skovlund (lskovlund)
Assigned to: Nobody/Anonymous (nobody)
Summary: Speed-up in array_repeat()

Initial Comment:
Use iterative doubling when extending the old array.
This results in O(log n) calls to memcpy() instead of O(n).

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>Comment By: Lars Skovlund (lskovlund)
Date: 2006-10-08 00:12

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I wrote this code for a university project I'm doing myself,
which involves initializing a *very* large array (it's a
remote memory system). It does help there, certainly; for
medium-sized arrays, the improvement would be negligable,
and for small ones it might even be worse.

If you mean, have I benchmarked it with other people's code,
no. I just thought I'd offer it to the community, since it
has certainly helped me.

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Comment By: Josiah Carlson (josiahcarlson)
Date: 2006-10-07 18:39

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Have you benchmarked this for repeats found "in the wild" to
establish *observable* speedup for code that already exists?

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