Buildworld and buildkernel with very slow compilation, recently

[Yasuhiro KIMURA]

From: Ronald Klop <ronald-lists at klop.ws>
Subject: Re: Buildworld and buildkernel with very slow compilation, recently
Date: Sun, 21 Jun 2020 14:48:51 +0200 (CEST)

> Building ports/pkgs is also significantly slower on 13 (new clang)
> than on 12.1.
> http://thunderx1.nyi.freebsd.org/
> 13 = 140 hours12.1 = 103 hoursFor roughly the same amount of ports.

>From /usr/src/UPDATING of head:

NOTE TO PEOPLE WHO THINK THAT FreeBSD 13.x IS SLOW:
        FreeBSD 13.x has many debugging features turned on, in both the kernel
        and userland.  These features attempt to detect incorrect use of
        system primitives, and encourage loud failure through extra sanity
        checking and fail stop semantics.  They also substantially impact
        system performance.  If you want to do performance measurement,
        benchmarking, and optimization, you'll want to turn them off.  This
        includes various WITNESS- related kernel options, INVARIANTS, malloc
        debugging flags in userland, and various verbose features in the
        kernel.  Many developers choose to disable these features on build
        machines to maximize performance.  (To completely disable malloc
        debugging, define MALLOC_PRODUCTION in /etc/make.conf, or to merely
        disable the most expensive debugging functionality run
        "ln -s 'abort:false,junk:false' /etc/malloc.conf".)

---
Yasuhiro KIMURA