Re: [viff-devel] Optimizing preprocessing
Martin Geisler wrote: Janus Dam Nielsen writes: Hi Marcel, I am not opposed to your suggestion. However I would like to point out that in VIFF you compute on shares and not field elements! Well, we've actually made the outer runtime interfaces in such a way that add, mul, xor, etc... accept both integers, FieldElements and Shares. The methods then wrap their input as needed -- or they *dont* wrap it if that leads to a short cut (e.g., constant multiplication) I agree (see also my answer). Computing directly on the field elements is hacking the abstractions of VIFF. Computation on field elements or rather the representation of a Share can be useful as an optimization, however this optimization should be confined within applications or runtimes, and should not progress over interface boundaries as I fear you are suggesting. I think we are in agreement: public methods on the runtimes will keep returning Shares. Methods used internally in runtimes can return other things as needed. To me it sounds like a better API to require preprocessing functions to return a list of Deferreds: [D(?), D(?), ...], instead of a Deferred list of tuples containing Deferreds :-) I think it will simplify the interface nicely, at least for consumers. Using simpler types also leads to less memory usage which has a positive effect on performance, as Marcel notes. So let's go for it. So this makes 2 votes in favour of it and 1 against it. Maybe we should have a meeting to discuss it. What do you think? Best regards, Marcel ___ viff-devel mailing list (http://viff.dk/) viff-devel@viff.dk http://lists.viff.dk/listinfo.cgi/viff-devel-viff.dk
Re: [viff-devel] viff 0.7.1 question
Angel Redoble writes: Hi Angel > I hope this question is not a bother to you. No, not at all :-) > I was trying to test viff-0.7.1, as I executed > generate-config-files.py, I got the error ¨ImportError: No module > named viff.config¨. Im not sure how to fix this problem. The error indicates that you have not put VIFF into your PYTHONPATH. The easiest way to solve this is to put export PYTHONPATH=$HOME/src/viff into your .bashrc (or similar shell startup file). Here I'm assuming that you've downloaded VIFF and put it into ~/src/viff. This means that you should have ~/src/viff: COPYING COPYING.LIB NEWS README apps doc run.py setup.py twisted viff The important part is that one can find viff/config.py inside a directory found in $PYTHONPATH. > Im using ubuntu 9.04. Excellent, then you should have it easy. -- Martin Geisler VIFF (Virtual Ideal Functionality Framework) brings easy and efficient SMPC (Secure Multiparty Computation) to Python. See: http://viff.dk/. ___ viff-devel mailing list (http://viff.dk/) viff-devel@viff.dk http://lists.viff.dk/listinfo.cgi/viff-devel-viff.dk
Re: [viff-devel] viff 0.7.1 question
> Hi, > > I hope this question is not a bother to you. No, not at all > I was trying to test viff-0.7.1, as I executed generate-config-files.py, I > got the error >¨ImportError: No module named viff.config¨. Im not sure how to > fix this problem. Most likely viff is not yet on your PYTHONPATH Please read: http://viff.dk/doc/install.html#installing-from-source for instructions on how to get it there. On Tue, Oct 20, 2009 at 2:27 PM, Angel Redoble wrote: > > Im using ubuntu 9.04. > > Thanks a lot. > > Angel > ___ > viff-devel mailing list (http://viff.dk/) > viff-devel@viff.dk > http://lists.viff.dk/listinfo.cgi/viff-devel-viff.dk > Sigurd ___ viff-devel mailing list (http://viff.dk/) viff-devel@viff.dk http://lists.viff.dk/listinfo.cgi/viff-devel-viff.dk
[viff-devel] viff 0.7.1 question
Hi, I hope this question is not a bother to you. I was trying to test viff-0.7.1, as I executed generate-config-files.py, I got the error ¨ImportError: No module named viff.config¨. Im not sure how to fix this problem. Im using ubuntu 9.04. Thanks a lot. Angel ___ viff-devel mailing list (http://viff.dk/) viff-devel@viff.dk http://lists.viff.dk/listinfo.cgi/viff-devel-viff.dk
