[Python-Dev] cpython: Implement PEP 412: Key-sharing dictionaries (closes #13903)

Mark Shannon mark at hotpy.org
Wed Apr 25 11:45:36 CEST 2012

Kristján Valur Jónsson wrote:
>> -----Original Message-----
>> From: python-dev-bounces+kristjan=ccpgames.com at python.org
>> [mailto:python-dev-bounces+kristjan=ccpgames.com at python.org] On
>> Behalf Of martin at v.loewis.de
>> Sent: 24. apríl 2012 17:44
>> To: python-dev at python.org
>> Subject: Re: [Python-Dev] cpython: Implement PEP 412: Key-sharing
>> dictionaries (closes #13903)
>>> Benchmarks should measure memory usage too, of course.  Sadly that is
>>> not possible in standard cPython.
>> It's actually very easy in standard CPython, using sys.getsizeof.
> Yes, you can query each python object about how big it thinks it is.
> What I'm speaking of is more like:
> start_allocs, start_mem = allocator.get_current()
> allocator.reset_limits()
> run_complicated_tests()
> end_allocs, end_mem = allocator.get=current()
> Print "delta blocks: %d, delta mem: %d"%(end_allocs-start_allocs, end_mem-start_mem)
> print "peak blocks: %d, peak mem: %d"%allocator.peak()

Take a look at the benchmark suite at
The test runner has an -m option that profiles memory usage,
you could take a look at how that is implemented


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