#nixos-dev on 2019-04-13

2019-04-11 14:17 sphalerite changed the topic of #nixos-dev to: NixOS Development (#nixos for questions) | NixOS 19.03 released! https://discourse.nixos.org/t/nixos-19-03-release/2652 | https://hydra.nixos.org/jobset/nixos/trunk-combined https://channels.nix.gsc.io/graph.html https://r13y.com | 19.03 RMs: samueldr,sphalerite | https://logs.nix.samueldr.com/nixos-dev

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01:13 <samueldr> just verified what I tested previously: it seems that the GC will always top at ~3.6GiB of heap size

01:14 <samueldr> evaluator_max_heap_size = 9990000000000 # which is a ridiculous number doesn't help

01:17 <samueldr> and I feel that ~3.6GiB is suspicious... suspiciously close to 32 bits, but far enough that I really don't know

01:17 <gchristensen> that ... is ... suspicious ...

01:18 <samueldr> though up to and including boehm GC's API, it looks like everything is definitely dealing within 64 bits

01:18 <samueldr> oh, I must add: I'm testing by adding aarch64-linux to supportedSystems

01:18 <gchristensen> nice

01:19 <gchristensen> I'm fighting my 2018 self really hard tongiht

01:19 <gchristensen> 2017*

01:23 <gchristensen> samueldr: maybe gdb can show you something

01:24 <samueldr> the 50 minutes eval to failure aren't prone to quickly figure things out :/

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01:25 <gchristensen> wtf

01:26 <samueldr> hm what?

01:26 <gchristensen> 50min

01:26 <gchristensen> would a m2.xlarge.x86 be helpful?

01:26 <samueldr> oh, hydra evaluator!

01:26 <samueldr> I'm not sure it would help

01:27 <samueldr> hmm, I was sure the time it took was printed on hydra, maybe only when it fails?

01:27 <samueldr> but I seem to recall them taking more than 20 minutes, don't have a number

01:28 <samueldr> it's the big "eval everything and don't forget about the cheese" one

01:29 <gchristensen> yea

01:30 <samueldr> oh right

01:30 <samueldr> the machine also was compiling a bunch of things :)

01:30 <gchristensen> ah

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01:33 <gchristensen> https://trac.openmodelica.org/OpenModelica/ticket/4755 probably not a useful connection, but

01:35 <samueldr> my main gut feeling is "heap fragmentation" but have no idea how it relates to all that, if it is even a thing

01:35 <gchristensen> no idea

01:38 <gchristensen> some of the ofborg source is Really Something.

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03:04 <worldofpeace> Fun fact, Apr 11 last year was my first contribution to NixOS. So I'm very proud to have been able to actively participate in https://discourse.nixos.org/t/nixos-19-03-release.

03:05 <worldofpeace> Thank you all and know that you matter. :)

03:06 <samueldr> thank you for the good work

03:12 <worldofpeace> samueldr: you were a key influence for me

03:30 <samueldr> that's hearwarming to hear

03:37 <samueldr> heartwarming*

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07:18 <sphalerite> <3 worldofpeace

07:18 <{^_^}> worldofpeace's karma got increased to 17

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22:50 <catern> I had this idea for "union stores" https://github.com/NixOS/nix/issues/2764

22:50 <{^_^}> nix#2764 (by catern, 1 minute ago, open): Support overlay/union-mounted stores

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