[Python-Dev] PEP for new dictionary implementation (original) (raw)

Mark Shannon mark at hotpy.org
Fri Feb 17 14:10:51 CET 2012

On 16/02/12 20:45, Antoine Pitrou wrote:

On Wed, 08 Feb 2012 19🔞14 +0000 Mark Shannon<mark at hotpy.org> wrote: Proposed PEP for new dictionary implementation, PEP 410? is attached.

So, I'm running a few benchmarks using Twisted's test suite (see https://bitbucket.org/pitrou/t3k/wiki/Home). At the end of python -i bin/trial twisted.internet.test: -> vanilla 3.3: RSS = 94 MB -> new dict: RSS = 91 MB At the end of python -i bin/trial twisted.python.test: -> vanilla 3.3: RSS = 31.5 MB -> new dict: RSS = 30 MB At the end of python -i bin/trial twisted.conch.test: -> vanilla 3.3: RSS = 68 MB -> new dict: RSS = 42 MB (!) At the end of python -i bin/trial twisted.trial.test: -> vanilla 3.3: RSS = 32 MB -> new dict: RSS = 30 MB At the end of python -i bin/trial twisted.test: -> vanilla 3.3: RSS = 62 MB -> new dict: RSS = 78 MB (!)

In theory, new-dict should never use more a few kbs more than vanilla. That looks like a serious leak. I'll investigate as soon as I get a chance. Which revision of new-dict are you using?

Cheers, Mark.

Runtimes were mostly similar in these test runs. Perspective broker benchmark (doc/core/benchmarks/tpclient.py and doc/core/benchmarks/tpserver.py): -> vanilla 3.3: 422 MB/sec -> new dict: 402 MB/sec Regards Antoine.

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