Date: Mon, 23 Jan 2017 02:24:57 -0500 From: Sergei Akhmatdinov <sakhmatd@riseup.net> To: freebsd-stable@freebsd.org Subject: Re: Building Kernel and World with -j Message-ID: <20170123022457.606a0d8e@riseup.net> In-Reply-To: <CAMPTd_A%2Be6JCJ8SPLGVh4M2Jb=ZLqHDWN9y8JLcVHgWO0=zJ8Q@mail.gmail.com> References: <CAMPTd_A%2Be6JCJ8SPLGVh4M2Jb=ZLqHDWN9y8JLcVHgWO0=zJ8Q@mail.gmail.com>
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--Sig_/IdMhN4t3V.fvQqn/KOhu_BE Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Sun, 22 Jan 2017 22:57:46 -0800 Walter Parker <walterp@gmail.com> wrote: > For decades there has always been a warning not to do parallel builds of > the kernel or the world (Linux kernel builds also suggest not to do this). >=20 > Every once in a while, I see people post about 5 minutes. This only way I > can see this happening is by doing a parallel build (-j 16 on a Xeon > Monster box). >=20 > Are parallel builds safe? If not, what are actual risk factors and can th= ey > be mitigated? Not only do I use -j, I also use ccache. Another option is to use WITH_META_MODE=3DYES, that's where most of the 5-m= inute reports come from, I imagine. I haven't used it myself. My kernel takes 10 minutes with world taking about two hours. I generally j= ust leave them building overnight. The risks of parallel builds are mostly in the past, concurrency was still = just coming out and there were chances that something would get compiled before = it's dependency, breaking your compile and wasting all of those hours. Cheers, --=20 Sergei Akhmatdinov My GPG public key: gpg --keyserver pgp.mit.edu --recv-keys AD800D99 --Sig_/IdMhN4t3V.fvQqn/KOhu_BE Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEFByDSlcPK9lAgiNNxKRHP62ADZkFAliFr8kACgkQxKRHP62A DZloCQ//bdpk8xRxqIYD8JegqNnrpxQFysipHQQXXlfFl+lOpXOQfY/0b941nqAA cLq5fN7lA6tzfNUpoZ0enDydgYnnqccD1JBjUFZgf2V68H2C4sFIx5E2iGRfPwHg ZRhh3/v/CsZ9ED3L+aZ+oBNuJCEk/luW1Mi1OxRBXXN7r4H4kMIb48i5fV2BDped y0QdCvrvsZBq+yzDZy12An7ZBtFEQyHUW1htZHRQX1jF4Q+dM8D57OYskXc75756 tlliEkwN1ieqs1fAMSNkkFtBCVhPfHPmgvfw07LTdKkaz08vh52MKSwYZXpxZH9Z b1cpFQbysuNMh2gtAYKmPjhSXpqRvvwGaDMD7PKPvDKRQ1GDSg6/4gypaJNR3tqq 6kdK0VcOgJZj8h1DrJemncoG59y9rzy1uP3HlmhKaKCVVaiTQW+MJ8Nk7Fy3aOH3 LrJjrcSfnLFsyj6f4+U5CtWw7cvmg3vzBHJknZ8ORuZEfdlKZvoxvn5jhFoqcwQA UVyxEeEbKmFhQeJ0aYyo8ER5zrWWoqgVhilIv7pjlXO29ByDeFXQqDCZquK3bmp0 izmRvAldQ7v6heNLoz3LOHVNSDg78DqtoaEhUDmH5xMekYBySRzIwnu6HbDyIe8R cPRXLgXeaYmLD2BAmoE83j5fSDvMwGWQC2nGSW646uyt/NV5u7M= =+vbQ -----END PGP SIGNATURE----- --Sig_/IdMhN4t3V.fvQqn/KOhu_BE--
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