On Mon, Oct 31, 2011 at 05:45:37PM +0100, Eelco Dolstra wrote: > On 10/30/2011 10:55 PM, Lluís Batlle i Rossell wrote: > > > On the sheevaplug, 512MB of physical RAM, and the same amount of swap: > > 7.88user 0.71system 0:09.86elapsed 87%CPU (0avgtext+0avgdata > > 617568maxresident)k > > 0inputs+0outputs (4major+41841minor)pagefaults 0swaps > > > > I think Eelco thinks there is a bug in 'time' about the remort of memory, > > showing something 4-times bigger or so on some systems. Maybe we have > > something > > bad about page-size in headers/kernel? > > I've looked into this and it turns out to be a bug in ‘time’. I've applied a > fix. > > FWIW, here are my stats (on a 64-bit machine): > > $ command time nix-env -i hello --dry-run > 0.72user 0.21system 0:00.96elapsed 97%CPU (0avgtext+0avgdata > 352008maxresident)k > > $ GC_INITIAL_HEAP_SIZE=100000 command time nix-env -i hello --dry-run > 1.46user 0.08system 0:01.57elapsed 98%CPU (0avgtext+0avgdata > 104540maxresident)k > > $ command time nix-env -f ~/Dev/nixpkgs -iA hello --dry-run > 0.07user 0.01system 0:00.10elapsed 82%CPU (0avgtext+0avgdata > 13388maxresident)k > > $ GC_INITIAL_HEAP_SIZE=100000 command time nix-env -f ~/Dev/nixpkgs -iA hello > --dry-run > 0.08user 0.01system 0:00.11elapsed 81%CPU (0avgtext+0avgdata > 12736maxresident)k > > $ command time nix-instantiate /etc/nixos/nixos -A system --readonly-mode > 1.00user 0.10system 0:01.11elapsed 99%CPU (0avgtext+0avgdata > 243636maxresident)k > > $ GC_INITIAL_HEAP_SIZE=100000 command time nix-instantiate /etc/nixos/nixos -A > system --readonly-mode > 1.34user 0.04system 0:01.39elapsed 99%CPU (0avgtext+0avgdata > 64544maxresident)k > > So NixOS system evaluation can run in 63 MiB.
It depends on having X or not, etc. And a bad guess on the initial heap size may be bad too. And how much of that memory can be freed before building? I think it's kept until the end of the build, right? Maybe not. Regards, Lluís. _______________________________________________ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev