New submission from Sergi Almacellas Abellana: By default, python xmlrpclib parser reads data by chunks of 1024 bytes [1], which leads to a lot of data concatenations when reading large data, which is very slow in python.
Increasing the chuck size from 1024 bytes to a higher value makes improve in performance. On the same machine, we have tested with 20MB of data and we've got the following results: Chucks of 1024: 1min 48.933491sec Chucks of 10 * 1024 * 1024: 0.245282sec We have chosen 10 * 1024 * 1024, as it is the same value used in issue792570 We have done our tests on python2.7, but same code exists for default branch [2] (and 3.x branches also [3][4][5][6]), so I belive all the versions are affected. I can work on a patch if you think this change is acceptable. IMHO it's logical to allow the developer to customize the chunk size instead of using a hard coded one. [1] https://hg.python.org/cpython/file/2.7/Lib/xmlrpclib.py#l1479 [2] https://hg.python.org/cpython/file/default/Lib/xmlrpc/client.py#l1310 [3] https://hg.python.org/cpython/file/3.5/Lib/xmlrpc/client.py#l1310 [4] https://hg.python.org/cpython/file/3.4/Lib/xmlrpc/client.py#l1324 [5] https://hg.python.org/cpython/file/3.3/Lib/xmlrpc/client.py#l1316 [6] https://hg.python.org/cpython/file/3.2/Lib/xmlrpc/client.py#l1301 ---------- components: XML messages: 257756 nosy: pokoli priority: normal severity: normal status: open title: Poor performance when reading large xmlrpc data _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue26049> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
