[asterisk-dev] BuildSystem: make --jobs without amount of thread hangs

[Scott Griepentrog]

I tested running -j without a process limit and while it was successful
building 13 on my primary desktop (8g ram 4 core machine with ssd), it
resulted in a load average over 40, sluggish response, and ran slightly
slower than -j$(nproc).  Here is my results:

1m32.204s => make -j
1m27.274s => make -j$(nproc)
4m50.423s => make

With a lessor powered system (1g ram, 1 cpu):

During make -j the system became extremely sluggish after the first few
minutes, with a load avg over 600 and over 1200 processes in running
state.  After about 20 minutes I gave up waiting for it to finish.
8m16.065s => make -j$(nproc)

If the high number of processes with -j starts eating enough virtual memory
that the page rate becomes significant, the system performance slows to a
crawl making the entire system unusable.

There is no problem in either make or Asterisk build process as far as I am
able to see.

On Thu, Jun 9, 2016 at 5:16 AM, Tzafrir Cohen <tzafrir.cohen at xorcom.com>
wrote:

> On Wed, Jun 08, 2016 at 02:09:04PM -0500, Matt Fredrickson wrote:
>
> > I usually don't build Asterisk with multiple jobs enabled, so I'm not
> > sure if we support this or not.
>
> IIRC it mostly work, but only as long as you don't mix 'make' and 'make
> install'. IIRC this is commonly used by packagers. But I may be wrong.
>
> --
>                Tzafrir Cohen
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> http://www.xorcom.com
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Scott Griepentrog
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