After update to r357104 build of poudriere jail fails with 'out of swap space'

[Steve Kargl]

On Sat, Jan 25, 2020 at 03:31:16PM -0800, Steve Kargl wrote:
> On Sat, Jan 25, 2020 at 02:09:29PM -0800, Cy Schubert wrote:
> > On January 25, 2020 1:52:03 PM PST, Steve Kargl <sgk at troutmask.apl.washington.edu> wrote:
> > >On Sat, Jan 25, 2020 at 01:41:16PM -0800, Cy Schubert wrote:
> > >> 
> > >> It's not just poudeiere. Standard port builds of chromium, rust
> > >> and thunderbird also fail on my machines with less than 8 GB.
> > >>
> > >
> > >Interesting.  I routinely build chromium, rust, firefox,
> > >llvm and few other resource-hunger ports on a i386-freebsd
> > >laptop with 3.4 GB available memory.  This is done with
> > >chrome running with a few tabs swallowing a 1-1.5 GB of
> > >memory.  No issues.  
> > 
> > Number of threads makes a difference too. How many core/threads does your laptop have?
> 
> 2 cores.
> 
> > Reducing number of concurrent threads allowed my builds to complete
> > on the 5 GB machine. My build machines have 4 cores, 1 thread per
> > core. Reducing concurrent threads circumvented the issue. 
> 
> I use portmaster, and AFIACT, it uses 'make -j 2' for the build.
> Laptop isn't doing too much, but an update and browsing.  It does
> take a long time especially if building llvm is required.
> 

In thinking about this and recalling watching top(1) during
my last firefox rebuild, it seems that the compiler can use
0.5-1 GB when compiling files.  I see how doing a parallel
build with "-j NCPU" could stress a <4 GB system.

-- 
Steve