2009/12/14 Marc Weber <marco-owe...@gmx.de>: > Hi. > > I posted earlier about hack-nix. > It's an attempt to read package description from hackage then resolving > dependencies automatically and finally creating nix derivations on the > fly. It works reasonable fast unless you allow many different versions. > > Them memory consumption raises > 4GB and .. all you can do is hitting > ctrl-c. > > Maybe there are many optimisations which can be applied. > However I feel that nix is the wrong language to write such a tool. > > So how do you think about extending nix so that you can use arbitrary > languages to implement builtin functions? > > Adding haskell specific code to nix itself is not the way to go, is it? > > So do you think we can extend nix so that it loads additional plugins > (.so files) which provide these features? > > Or how would you try to enhance speed for specific tasks ? > > Probably I don't have time to implement it but I'd like to know how you > think about it. > > Marc Weber > _______________________________________________ > nix-dev mailing list > nix-dev@cs.uu.nl > https://mail.cs.uu.nl/mailman/listinfo/nix-dev >
Hi Marc, Maybe you want to create a binary depsolver that can be used in a builder script instead or is there too much going on? I guess extending nix using any language like perl, ruby, php, python, etc should be trivial if nix has hooks. Maybe nix would benefit from a helper framework to tell other things what it's doing or to ask it to do things? Stuff like : Don't start this silly two hour build transaction, if I'm running my machine on batteries, kind of thing. Or run nix with lower priority if I switch to watching a game or playing a video, etc. So like, calculate this really hard cabal-install transaction, then create the expression file for it and tell nix to package it sort of thing? Sort of like a nix policy kit that sits there with the nix daemon and lets programs use nix without actually going straight to nix. If your memory usage for your hack-nix is getting too high with big transactions, is it spawning too fast? Is there no way you can put a break on it by doing a simple updated count before and after you do a transaction into a global variable, set a limit and tell each transaction in the loop to wait until the number of transactions has decreased to a number below the set maximum limit? Thanks, Tony _______________________________________________ nix-dev mailing list nix-dev@cs.uu.nl https://mail.cs.uu.nl/mailman/listinfo/nix-dev
