** Description changed: [Impact] Performance under Python 2 with this package since 1.54 is poor due to the lack of use of the native C implementation of pickle. [Test Case] - TBC + run attached memcache-test.py under python 2. + with proposed fixes, should be approximately [Regression Potential] The picked fix is relatively minor and simply adjusts the import under Py2 to use the native C implementation so regression potential will be low. [Original Bug Report] Just migrated a python 2 application from 14.04 LTS to 18.04 LTS and got a serious performance degradation. Like 1000 times slower. After some profiling it was concluded that the problem was the transition from cPickle back to pickle for data serialization. This is a problem fixed in version 1.58. https://github.com/linsomniac/python-memcached/releases/tag/1.58 Please upgrade python-memcache to a more recent version or patch the current version. Versions affected: Ubuntu 16.04 LTS and Ubuntu 18.04 LTS
** Attachment added: "memcache-test.py" https://bugs.launchpad.net/ubuntu/+source/python-memcache/+bug/1802487/+attachment/5215270/+files/memcache-test.py ** Description changed: [Impact] Performance under Python 2 with this package since 1.54 is poor due to the lack of use of the native C implementation of pickle. [Test Case] run attached memcache-test.py under python 2. - with proposed fixes, should be approximately + with proposed fixes, should be approximately 2/3 of the execution time of the unpatched version. [Regression Potential] The picked fix is relatively minor and simply adjusts the import under Py2 to use the native C implementation so regression potential will be low. [Original Bug Report] Just migrated a python 2 application from 14.04 LTS to 18.04 LTS and got a serious performance degradation. Like 1000 times slower. After some profiling it was concluded that the problem was the transition from cPickle back to pickle for data serialization. This is a problem fixed in version 1.58. https://github.com/linsomniac/python-memcached/releases/tag/1.58 Please upgrade python-memcache to a more recent version or patch the current version. Versions affected: Ubuntu 16.04 LTS and Ubuntu 18.04 LTS -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1802487 Title: Fix performance regression in v1.57 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/python-memcache/+bug/1802487/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
