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On Tue, Feb 21, 2017 at 12:22:51AM +0000, Neil Bothwick wrote |
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> If the chroot is identical to your netbooks's install in terms of |
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> *FLAGS, USE, @world etc, then yes. I used to do it this way when I had an |
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> Atom netbook. I even build for a low memory 486 system in the same way. |
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Unfortunately, the cpus are different enough that CFLAGS, CXXFLAGS, |
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and CPU_FLAGS_X86 are different. See the web page... |
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https://gcc.gnu.org/onlinedocs/gcc-4.9.4/gcc/i386-and-x86-64-Options.html#i386-and-x86-64-Options |
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I actually use "-march=native" in make.conf, but this translates as... |
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* The netbook cpu equals "-march=bonnell" (first-generation Atom). |
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* My current desktop equals "-march=ivybridge" |
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* My "hot backup" machine equals "-march=silvermont" |
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The natively-compiled code on the netbook will not run on my desktop |
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because the Ivybridge cpu doesn't support MOVBE instructions. The |
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netbook has 2 gigs of ram. I estimate 12 hours if I |
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* changed CFLAGS to "-march=core2" and adjusted CPU_FLAGS_X86 |
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* and ran "emerge -e @world" on the netbook. |
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That would produce "lowest common denominator" code that would run on |
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both the netbook and my desktop. Then I could rsync the contents of the |
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netbook into what would become a chroot directory on the desktop. After |
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that, I'd have to change to "-march=native", adjust CPU_FLAGS_X86, and |
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then "emerge -e @world" on both the netbook and the desktop's chroot. |
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A better option would be to |
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* rsync the contents of the netbook to the Silvermont. It's a newer |
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Atom-family cpu, and can handle MOVBE instructions. |
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* change CFLAGS to "-march=silvermont -mno-movbe" and "emerge -e @world" |
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on the Silvermont. It has a newer, more powerful cpu than netbook, |
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and also 8 gigs of ram, versus the netbook's 2 gigs. A full rebuild |
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won't take anywhere near as long. |
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* rsync the contents of the Silvermont's chroot directory to the |
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Ivybridge desktop. |
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> Oh, and you don't need a package server, just export PKGDIR via NFS |
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> and mount it on the netbook. |
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I see nfs as being more complex with kernel settings required for |
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client and server, not to mention config files all over the place. |
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Gentoo has python as part of the system. To fire up a very simple |
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binary package webserver from a commandline (xterm/whatever)... |
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In python 2.x |
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cd /usr/portage/packages |
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python -m SimpleHTTPServer nnnn |
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In python 3.x |
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cd /usr/portage/packages |
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python3 -m http.server nnnn |
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...where "nnnn" is the desired port number to listen on. In both cases |
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the default port is 8000 if not specified. Note that only root can open |
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privileged ports in the range 0..1023. |
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-- |
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Walter Dnes <waltdnes@××××××××.org> |
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I don't run "desktop environments"; I run useful applications |
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