> -----Original Message----- > From: python-dev-bounces+kristjan=ccpgames....@python.org > [mailto:python-dev-bounces+kristjan=ccpgames....@python.org] On > Behalf Of mar...@v.loewis.de > Sent: 24. apríl 2012 17:44 > To: python-dev@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() > > Btw, this is of great interest to me at the moment, our Shanghai > > engineers are screaming at the memory waste incurred by dictionaries. > > A 10 item dictionary consumes 1/2k on 32 bits, did you know this? > > I did. > > In Python 3.3, this now goes down to 248 bytes (32 bits). > I'm going to experiment with tunable parameters in 2.7 to trade performance for memory. In some applications, memory trumps performance. K _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
