Re: rust build requirements

[Greg Troxel <gdt%lexort.com@localhost>]

Jan Danielsson <jan.m.danielsson%gmail.com@localhost> writes:

>    I have read that building rust requires a ridiculous amount of
> memory, but I don't recall anyone specifying exactly how much that
> is. To limit wear and tear, I build all packages on a tmpfs, so I need
> the source, intermediate and target files to fit in memory.  What is a
> ballpark guesstimate on how much free RAM one would need to avoid
> swapping when building rust on NetBSD/adm64 8.1 using 4 cores?

I have a machine that was high-end in 2014 (passed on by a gamer friend
:), with 24G of physical ram, 4 cores, SSD, and a 12G tmpfs where I put
pkgsrc workdirs.  That builds rust ok.

I have two 10ish-year-old notebooks with 3 and 4G of RAM, 2 cores each
of i386 and amd64 respectively, spinning laptop disk, and smallish tmpfs
(0.75/1G ) where I do NOT put pkgsrc workdirs.  Those build rust, but it
takes a crazy long time.

Build timestamps from 24G 2014-era desktop and 4G old notebook

  -rw-r--r--  1 root  wheel    18483 Jul 28 08:08 py27-test-4.6.3nb1
  -rw-r--r--  1 root  wheel     1610 Jul 28 08:08 py27-test-runner-4.4
  -rw-r--r--  1 root  wheel     1414 Jul 28 08:08 py27-olefile-0.46
  -rw-r--r--  1 root  wheel  2091477 Jul 28 09:53 rust-1.36.0
  -rw-r--r--  1 root  wheel     2124 Jul 28 09:54 libpaper-1.1.28
  -rw-r--r--  1 root  wheel    32855 Jul 28 09:54 py37-setuptools-41.0.1
  -rw-r--r--  1 root  wheel     1134 Jul 28 09:55 py37-six-1.12.0

  -rw-r--r--  1 root  wheel    56637 Jul 29 12:59 xscreensaver-5.40nb1
  -rw-r--r--  1 root  wheel     8677 Jul 29 13:00 asciidoc-8.6.10nb1
  -rw-r--r--  1 root  wheel      827 Jul 29 13:02 rhash-1.3.8
  -rw-r--r--  1 root  wheel  2091477 Jul 30 03:26 rust-1.36.0
  -rw-r--r--  1 root  wheel     1674 Jul 30 03:37 openjpeg-2.3.1
  -rw-r--r--  1 root  wheel     1023 Jul 30 03:43 poppler-0.79.0

That's 1h45m and 14h24m.

I'm not really sure it doesn't swap on the big box, but I have tmpfs at
12G, so tmpfs even if full will allow 10G+ for programs

On the notebook, I have no idea.  That machine's purpose in life now is
to build packages to look for trouble.

Earlier my 2014 box had 8G of tmpfs, because that seemed like a lot.
But something failed to fit, and I don't remember what it was.  It could
well have been rust.