Author vstinner
Recipients Jelle Zijlstra, eric.smith, inada.naoki, ncoghlan, pitrou, rhettinger, serhiy.storchaka, vstinner, xiang.zhang
Date 2017-07-17.13:01:03
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Message-id <1500296463.44.0.260677862524.issue28638@psf.upfronthosting.co.za>
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Content
Benchmark comparing collections.namedtuple to structseq, to get an attribute:

* Getting an attribute by name (obj.attr):
  Mean +- std dev: [name_structseq] 24.1 ns +- 0.5 ns -> [name_namedtuple] 45.7 ns +- 1.9 ns: 1.90x slower (+90%)
* Getting an attribute by its integer index (obj[0]):
  (not significant)

So structseq is 1.9x faster than namedtuple to get an attribute by name.


haypo@speed-python$ ./bin/python3  -m perf timeit -s "from collections import namedtuple; Point=namedtuple('Point', 'x y'); p=Point(1,2)" "p.x" --duplicate=1024 -o name_namedtuple.json
Mean +- std dev: 45.7 ns +- 1.9 ns
haypo@speed-python$ ./bin/python3  -m perf timeit -s "from collections import namedtuple; Point=namedtuple('Point', 'x y'); p=Point(1,2)" "p[0]" --duplicate=1024 -o int_namedtuple.json
Mean +- std dev: 17.6 ns +- 0.0 ns


haypo@speed-python$ ./bin/python3  -m perf timeit -s "from sys import flags" "flags.debug" --duplicate=1024 -o name_structseq.json
Mean +- std dev: 24.1 ns +- 0.5 ns
haypo@speed-python$ ./bin/python3  -m perf timeit -s "from sys import flags" "flags[0]" --duplicate=1024 -o int_structseq.json
Mean +- std dev: 17.6 ns +- 0.2 ns

---

Getting an attribute by its integer index is as fast as tuple:

haypo@speed-python$ ./bin/python3  -m perf timeit --inherit=PYTHONPATH -s "p=(1,2)" "p[0]" --duplicate=1024 -o int_tuple.json
.....................
Mean +- std dev: 17.6 ns +- 0.0 ns
History
Date User Action Args
2017-07-17 13:01:03vstinnersetrecipients: + vstinner, rhettinger, ncoghlan, pitrou, eric.smith, inada.naoki, serhiy.storchaka, xiang.zhang, Jelle Zijlstra
2017-07-17 13:01:03vstinnersetmessageid: <1500296463.44.0.260677862524.issue28638@psf.upfronthosting.co.za>
2017-07-17 13:01:03vstinnerlinkissue28638 messages
2017-07-17 13:01:03vstinnercreate