| chat.freenode.net #tryton log beginning Thu Sep 23 00:00:01 CEST 2010 | ||
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| 2010-09-23 11:51 <cedk> sharoon: you pinged me yesterday | ||
| 2010-09-23 11:51 <sharoon> cedk: yes, it was about the read API performance improvement | ||
| 2010-09-23 11:52 <sharoon> cedk: one min | ||
| 2010-09-23 11:53 <sharoon> cedk: looking at the whole data, we cannot use namedtuples because they cannot be pickled | ||
| 2010-09-23 11:54 <sharoon> cedk: so i have built a custom datastructure subclassing list | ||
| 2010-09-23 11:54 <sharoon> cedk: it is faster than list of dict and occupies much lesser space | ||
| 2010-09-23 11:57 <cedk> sharoon: what is the issue with pickle? | ||
| 2010-09-23 11:58 <sharoon> cedk: the pickle protocol needs the class/object to first create an instance and then set its state | ||
| 2010-09-23 11:59 <sharoon> cedk: in the case of namedtuples, this cannot be done because it acts as a class factory and the created class has no reference in a module in applications similar to ours | ||
| 2010-09-23 11:59 <sharoon> cedk: so pickling on server side and then unpickling on client side is impossible | ||
| 2010-09-23 12:02 <cedk> sharoon: just pass a tuple | ||
| 2010-09-23 12:03 <bechamel> cedk: how the client will re-map each tuple position with a field name ? | ||
| 2010-09-23 12:03 <sharoon> cedk: the __reduce__ method for the new pickle protocol is not capable of doing it too, i already checked that | ||
| 2010-09-23 12:04 <cedk> bechamel: it is the order of the field readed | ||
| 2010-09-23 12:10 <bechamel> sharoon: to pickle namedtuple, I have found this: http://docs.activestate.com/activepython/3.1/python/library/pickle.html#persistence-of-external-objects | ||
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| 2010-09-23 12:22 <sharoon> bechamel: thanks, will try but we still have quite a few issues to resolve... like the _ prefix in _datetime | ||
| 2010-09-23 12:23 <sharoon> cedk: bechamel: will put forward both the solutions | ||
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| 2010-09-23 15:37 <cedk> sharoon: I still don't understand why namedtuple could not work (except for '_') | ||
| 2010-09-23 15:39 <sharoon> cedk: i got pickled in my test code because both name of element and the name of namedtuuple is same + its a global in known namespace | ||
| 2010-09-23 15:39 <sharoon> cedk: it wont pickle in a different thread/file | ||
| 2010-09-23 15:39 <cedk> sharoon: you should pickle in list of tuple | ||
| 2010-09-23 15:41 <sharoon> cedk: which means a custom pickler | ||
| 2010-09-23 15:41 <cedk> sharoon: yes | ||
| 2010-09-23 15:44 <sharoon> cedk: i will try and update here again | ||
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| 2010-09-23 15:45 <sharoon> cedk: i am sure it will be slower because we have to subclass python pickle, not cpickle | ||
| 2010-09-23 15:49 <cedk> sharoon: in fact, I think this become too complicated | ||
| 2010-09-23 15:50 <cedk> sharoon: I'm thinking that we should just use list of tuple | ||
| 2010-09-23 15:50 <sharoon> cedk: ideal according to me | ||
| 2010-09-23 15:50 <cedk> sharoon: it is free to the reader to use or not namedtuple | ||
| 2010-09-23 15:50 <sharoon> cedk: exactly | ||
| 2010-09-23 15:51 <sharoon> cedk: only problem is where read method has been overwritten | ||
| 2010-09-23 15:51 <cedk> sharoon: it would be great to use namedtuple because it is in Python base but if it bring more issues then it solves then we should leave it | ||
| 2010-09-23 15:53 <sharoon> cedk: also i think the gzip_threshold is too low | ||
| 2010-09-23 15:53 <sharoon> cedk: gzip seems to be very slow, esp for small requsts? | ||
| 2010-09-23 15:55 <cedk> sharoon: we don't zip small request | ||
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| 2010-09-23 15:56 <sharoon> cedk: but 1400 seems to be too low? | ||
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| 2010-09-23 15:58 <sharoon> cedk: coming back to the discussion about read method, i suggest that we go for list of tuples, improve the performance there | ||
| 2010-09-23 15:59 <cedk> sharoon: 1400 is common MTU | ||
| 2010-09-23 15:59 <cedk> sharoon: agree, normally read is only use internaly in trytond/model and in client | ||
| 2010-09-23 16:00 <sharoon> cedk: users who want to creatively use the read data for their custom apps could build dictionaries or if performance is key, build something like i built for their custom apps? | ||
| 2010-09-23 16:01 <cedk> sharoon: best is to use namedtuple :-) | ||
| 2010-09-23 16:01 <sharoon> cedk: this could be easily done from a list of tuple thats returned | ||
| 2010-09-23 16:01 <cedk> sharoon: with a map | ||
| 2010-09-23 16:02 <cedk> sharoon: like in the example http://docs.python.org/dev/library/collections.html#collections.namedtuple | ||
| 2010-09-23 16:02 <sharoon> cedk: i understand you like named tuples ;) BTW, there could be one last thing to do, that is using __getnewargs__ | ||
| 2010-09-23 16:02 <cedk> sharoon: don't know about getnewargs | ||
| 2010-09-23 16:03 <sharoon> cedk: the thought is, using __reduce__ for pickling and returning namedtuple itself as a class instance | ||
| 2010-09-23 16:03 <sharoon> cedk: let me check | ||
| 2010-09-23 16:04 <sharoon> cedk: i will tryt and get back | ||
| 2010-09-23 16:35 <sharoon> cedk: ping | ||
| 2010-09-23 16:36 <cedk> sharoon: pong | ||
| 2010-09-23 16:37 <sharoon> cedk: namedtuples cannot be implemented because there would be absolutely no way of regenerating them on the client side :( | ||
| 2010-09-23 16:38 <cedk> sharoon: no problem let's go with list of tuples | ||
| 2010-09-23 16:38 <sharoon> cedk: ok | ||
| 2010-09-23 16:38 <cedk> sharoon: I think you did not understand me | ||
| 2010-09-23 16:38 <cedk> I think that a programmer inside tryton could get namedtuple from read if he wants | ||
| 2010-09-23 16:38 <cedk> it will be very simple | ||
| 2010-09-23 16:39 <sharoon> cedk: that is simple | ||
| 2010-09-23 16:40 <cedk> sharoon: so let's go with list of tuple | ||
| 2010-09-23 16:40 <cedk> sharoon: it will be great to have it for 1.8 | ||
| 2010-09-23 16:40 <sharoon> cedk: yep | ||
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| 2010-09-23 16:47 <sharoon> cedk: we need to get easy_install trytond=dev to get to work! | ||
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| 2010-09-23 18:05 <cedk> sharoon: don't understand | ||
| 2010-09-23 18:06 <sharoon> cedk: can we have a sudo easy_install trytond=dev to install the development version? | ||
| 2010-09-23 18:09 <cedk> sharoon: is it not working? | ||
| 2010-09-23 18:09 <cedk> sharoon: fill an issue | ||
| 2010-09-23 18:09 <sharoon> cedk: sure | ||
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