Re: [Nix-dev] `fast-eval' branch merged
Eelco Dolstra, the results of your work rock! Doing dependency analysis of hack-nix was: 17.08 total (secs) is now: 2.8 total (secs) Marc Weber ___ nix-dev mailing list nix-dev@cs.uu.nl https://mail.cs.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] `fast-eval' branch merged
Hello, On Wed, May 12, 2010 at 04:01:08PM +0200, Eelco Dolstra wrote: > Hi, > > I've merged the Nix `fast-eval' branch into the trunk. Is there any good reason not to update nixpkgs nixUnstable and nixSqlite to the latest tarballs built by hydra? I have the commits ready in git-svn; I'm about to test the speed change in the Sheevaplug. I will report on it. ___ nix-dev mailing list nix-dev@cs.uu.nl https://mail.cs.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] `fast-eval' branch merged
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 05/12/2010 07:15 PM, Marc Weber wrote: > /me is waiting for JIT now :)) *kidding* Do a Nix -> something JITtable convertor then. Should be simpler.. -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.12 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJL631GAAoJEE6tnN0aWvw3WlMH/Aksg1UUggu7dexUC4kOZAoA aS/9yv48EtPwON/pwkSTpvz3TrjebQddWO52rMSmqKZoWAm0caOSxfymqWkpRIEN Uxyapdjke/Ey+V8xPCrEO7YJkcB37Qqvd7jzcjZTi4WgLYYjhjYmHIE3BsOuhmOo vvtPlzCLBBTYVnGMBJ4QUdLPRPOdzRiRg8jOhmPg+sh6HRe5JkJoauO5bFhaMSP/ duj/lKflzG3cdDoTNFzRdieY7vbFkohgHa25xPEqI+0lOtq1DKJr11Ic9ocJoGBh IsXAt1y5vhZcyCLfG3a9pCSS9uTWBQSk//AE29YzENlm3FPxItSYkj/1ksvlyy8= =y0NG -END PGP SIGNATURE- ___ nix-dev mailing list nix-dev@cs.uu.nl https://mail.cs.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] `fast-eval' branch merged
On Wed, May 12, 2010 at 04:01:08PM +0200, Eelco Dolstra wrote: > Hi, > > I've merged the Nix `fast-eval' branch into the trunk. Fantàstic! I was waiting the merge :) Thank you. ___ nix-dev mailing list nix-dev@cs.uu.nl https://mail.cs.uu.nl/mailman/listinfo/nix-dev
RE: [Nix-dev] `fast-eval' branch merged
Merging the sqlite branch will give us another speed up as well (hopefully) :-) -Original Message- From: nix-dev-boun...@cs.uu.nl on behalf of Marc Weber Sent: Wed 5/12/2010 5:15 PM To: nix-dev Subject: Re: [Nix-dev] `fast-eval' branch merged Excerpts from Nicolas Pierron's message of Wed May 12 17:07:44 +0200 2010: > Great News :) I second that. hack-nix will be a nice test case as well. /me is waiting for JIT now :)) *kidding* Marc Weber ___ nix-dev mailing list nix-dev@cs.uu.nl https://mail.cs.uu.nl/mailman/listinfo/nix-dev ___ nix-dev mailing list nix-dev@cs.uu.nl https://mail.cs.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] `fast-eval' branch merged
Excerpts from Nicolas Pierron's message of Wed May 12 17:07:44 +0200 2010: > Great News :) I second that. hack-nix will be a nice test case as well. /me is waiting for JIT now :)) *kidding* Marc Weber ___ nix-dev mailing list nix-dev@cs.uu.nl https://mail.cs.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] `fast-eval' branch merged
Hi, Great News :) On Wed, May 12, 2010 at 16:01, Eelco Dolstra wrote: > Hi, > > I've merged the Nix `fast-eval' branch into the trunk. This replaces the > current Nix expression evaluator by a new, faster implementation. It no > longer > uses the term-rewriting based approach (described in [1]) but a more > conventional functional language implementation based on thunk updating. As a > result, Nix no longer depends on the ATerm library. > > Here are some benchmark results to show the performance improvement. The > benchmarks are: > > - `nix-env -f /etc/nixos/nixpkgs -qa \*' on Nixpkgs r21747. > - `nix-env -f /etc/nixos/nixpkgs -qa \* --drv-path'. > - `nix-instantiate /etc/nixos/nixos -A system --readonly-mode' (also on r21747 > of NixOS). This is what every `nixos-rebuild' operation does. > - `nix-instantiate /etc/nixos/nixos/tests/ -A proxy.test --readonly-mode' > (which > evaluates 4 NixOS system configurations). > > These were done on a 32-bit Linux machine (Intel Core 2 Duo T7700 @ 2.40GHz, 2 > GiB RAM) and on a 64-bit Linux machine (Intel Core i5 750 @ 2.67GHz, 6 GiB > RAM). > Here are the timings in seconds: > > | Old | New | Speedup > -+---+--+ > `nix-env -qa' (32-bit) | 2.96 | 0.60 | 4.9x > `nix-env -qa' (64-bit) | 1.86 | 0.32 | 5.8x > `nix-env -qa --drv-path' (32-bit) | 12.48 | 3.96 | 3.2x > `nix-env -qa --drv-path' (64-bit) | 7.65 | 2.04 | 3.8x > `nix-instantiate -A system' (32-bit) | 6.79 | 1.32 | 5.1x > `nix-instantiate -A system' (64-bit) | 4.63 | 0.71 | 6.5x > `nix-instantiate -A proxy.test' (32-bit) | 23.86 | 3.55 | 6.7x > `nix-instantiate -A proxy.test' (64-bit) | 15.76 | 1.95 | 8.1x > > Another goal of the `fast-eval' branch was to reduce memory consumption by the > evaluator. The old evaluator basically never released memory due to its > normal > form cache. With the new evaluator, we can in principle reclaim garbage > memory. > However, it doesn't actually have a garbage collector yet. I intend to use > the > Boehm GC for that. Nevertheless, the new evaluator already uses less memory > than the old one. For instance, `nix-instantiate -A system' on 64-bit Linux > uses 358.6 MiB with the old evaluator, but only 213.7 MiB with the new > evaluator > (according to Valgrind's `massif' tool). > > [1] http://www.st.ewi.tudelft.nl/~dolstra/pubs/laziness-ldta2008-final.pdf -- Nicolas Pierron http://www.linkedin.com/in/nicolasbpierron - http://nbp.name/ ___ nix-dev mailing list nix-dev@cs.uu.nl https://mail.cs.uu.nl/mailman/listinfo/nix-dev
