I'm sure there is potential for improvement on the current orderinglist code- please feel free to send a patch with optimizations you've found to the SA trac.
The orderinglist hasn't changed much since 0.3, but with 0.5 there may be entirely new implementations possible. For example, I could imagine one that defers calculation and manipulation of the positioning information until a before_flush hook. That may be perform better, with the trade-off that the position attribute can't be trusted to be in sync with the list order. jean-philippe dutreve wrote: > Below is the profiling of code that added 1200 items into an > ordering_list relation. I had to bypass the ordering_list stuff for > bulk additions in order to have better performance (down to 2 > seconds). > Hope this post helps to improve this part (using 0.5.0rc1, python 2.5, > linux i686, 1.5Go RAM) > > SA is rocking! > jean-philippe > > Time elapsed: 48.4475638866 s > 8875046 function calls (8869157 primitive calls) in 48.443 > CPU seconds > > Ordered by: internal time, call count > List reduced from 390 to 10 due to restriction <10> > > ncalls tottime percall cumtime percall > filename:lineno(function) > 1292937/1292250 7.879 0.000 12.134 0.000 attributes.py: > 132(__get__) > 1241013 7.662 0.000 39.836 0.000 orderinglist.py: > 221(_order_entity) > 1241013 5.870 0.000 16.916 0.000 orderinglist.py: > 202(_get_order_value) > 440809 4.522 0.000 9.527 0.000 attributes.py:394(set) > 1236 4.198 0.003 44.025 0.036 orderinglist.py: > 208(reorder) > 1299736/1299048 3.752 0.000 4.373 0.000 attributes.py: > 310(get) > 448225 3.337 0.000 5.157 0.000 identity.py: > 208(modified_event) > 437061 2.704 0.000 14.331 0.000 orderinglist.py: > 205(_set_order_value) > 440809 2.225 0.000 11.752 0.000 attributes.py: > 126(__set__) > 448225 1.775 0.000 1.812 0.000 attributes.py: > 958(modified_event) > > > > Function was called by... > attributes.py:132(__get__) <- domain.py:200(addEntry) > (1236) 46.741 > domain.py:248(__init__) > (1236) 47.832 > domain.py:272(get)(49452) > 0.609 > orderinglist.py: > 202(_get_order_value)(1241013) 16.916 > orderinglist.py:221(_order_entity) <- orderinglist.py:208(reorder) > (1240326) 44.025 > orderinglist.py:232(append) > (687) 0.013 > orderinglist.py:202(_get_order_value) <- orderinglist.py: > 221(_order_entity)(1241013) 39.836 > attributes.py:394(set) <- attributes.py:126(__set__) > (440809) 11.752 > orderinglist.py:208(reorder) <- orderinglist.py: > 266(__setslice__)(1236) 44.061 > attributes.py:310(get) <- attributes.py:132(__get__) > (1292937) 12.134 > attributes.py: > 347(get_committed_value)(1) 0.000 > attributes.py:500(set) > (3708) 0.367 > attributes.py: > 837(value_as_iterable)(3090) 0.108 > identity.py:208(modified_event) <- attributes.py:394(set) > (440809) 9.527 > attributes.py: > 525(fire_replace_event)(3708) 0.236 > attributes.py: > 579(fire_append_event)(3708) 1.960 > orderinglist.py:205(_set_order_value) <- orderinglist.py: > 221(_order_entity)(437061) 39.836 > attributes.py:126(__set__) <- domain.py: > 237(_set_attributes)(1276) 0.079 > domain.py:255(update) > (2472) 0.089 > orderinglist.py: > 205(_set_order_value)(437061) 14.331 > attributes.py:958(modified_event) <- identity.py: > 208(modified_event)(448225) 5.157 > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
