Painfully slow compilation (read: "make buildworld buildkernel") on not-so-weak system

Mateusz Guzik mjguzik at
Sat Dec 8 14:27:45 UTC 2018

On 12/8/18, Lev Serebryakov <lev at> wrote:
> Hello Lev,
> Saturday, December 8, 2018, 2:13:03 PM, you wrote:
>>  Even when build is single-job, system becomes unresponsive. With
>> 4-job build running it could takes up to minute to switch screen's
>> windows!
>  And even with 1-job kernel build upsmon's connection to remote upsd
> flickers! Unbelievable.
>  Looks like each next compiler invocation is slower and more stressful than
> previous one.

Is this a fresh install?

Can you please narrow the problem down to a specific kernel revision?
Most importantly, does this show up with a 12.0 kernel?

I'm running one amd box and a number of intel boxes with various cpus,
no issues.

Mateusz Guzik <mjguzik>

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