[Twisted-Python] cBanana diffs
Bruce Mitchener
bruce at cubik.org
Tue Jul 9 03:17:32 EDT 2002
Bruce Mitchener wrote:
> Itamar Shtull-Trauring wrote:
>> Bruce Mitchener wrote:
>>> I've made a couple of local changes to cBanana to look at improving
>>> the performance of it some.
>>
>> Great! Got any numbers showing the speed difference?
>
> Nothing reliable. I was just testing with doc/examples/pbbenchserver.py
> and pbbenchclient.py and looking at how many calls/second were being made.
>
> This week, I'm planning on putting together a quick Banana bench and
> then I'll be able to test it directly and with more predictable loads to
> exercise the parts that I'm changing. :)
>
> That'll let me get reliable and useful numbers and do some targeted
> profiling as well I hope.
So, I wrote this crappy program that works to test decoding from banana:
http://day.cubik.org/~bruce/bananabench.py
10000 iterations of decoding the banana-encoded form of:
[1, 2, [3, 4], [30.5, 40.2], 5, ["six", "seven", ["eight", 9]], [10], []]
had these results:
Pure Python: 22.56 seconds
CVS cBanana: 1.15 seconds
My cBanana: 0.98 seconds
Now, that data is list heavy, so it is particularly suited to enjoy the
benefits of my patch. But, given the sorts of data that I know we pass
around at work (not in Twisted), our data is typically pretty list
heavy. Glyph said that PB stuff is usually pretty list-heavy as well.
So, that looks to be a gain.
I ran it under valgrind and that didn't seem to turn up any leaks.
Cheers,
- Bruce
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