On Tue, Aug 27, 2013 at 05:10:42PM -0700, Paul D. DeRocco wrote: > > From: Gary Thomas > > > > As far as I understand, the 'do_rootfs' step in building an > > image is basically > > equivalent to running "${PKG_MGR} install > > <all_required_packages>", where PKG_MGR > > is your package management method of choice - ipk or rpm. > > This seems to me to > > be a very single-threaded process. > > If there's a way to command the package manager to install a package > without enforcing dependencies (Is that what opkg --nodeps does?), then > couldn't the package manager be invoked on one package at a time in n > threads, just like the other tasks are now run? I don't really have any > sense of how long it takes to install the packages, as opposed to building > the final tarball or hddimage and applying the permissions from the pseudo > database, which would certainly be single-threaded. > > > Perhaps you should think more about how you are using this. > > If you don't need > > to rebuild the whole image every time, maybe you can use the > > package management > > tools instead? For example, I routinely build images as well > > but I also try to > > use 'opkg' as much as possible to manage package updates, > > etc. This is a huge > > time saver, especially when making small or incremental > > changes. I only rely > > on the full image builds when I want to "checkpoint" the > > state of the system. > > I'd like to try that, but I'm not sure how. If I've tweaked one recipe, > how do I get it to build it and package it, and then stop? Do I use > "bitbake -c package"? And then do I use "opkg -d" to manually install it > directly onto my SD card? If my rootfs is a loop mounted hddimage in a > FAT16 file (as it is on my Atom project), do I loop mount it on my build > system and install into that? > > Installing directly to the card would be nice because copying the whole > damn rootfs to the card takes an annoying amount of time, too.
Are you sure that you're not building some unnecessary IMAGE_FSTYPES? Last time someone asked my why it takes so long I've added some debug output to do_rootfs and found out that only half of the time was opkg installing packages and the rest was various IMAGE_FSTYPES. e.g. tar.bz2 takes very long without pbzip2 or lbzip2 -- Martin 'JaMa' Jansa jabber: martin.ja...@gmail.com
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