Speeding up the Debian installer using eatmydata and dpkg-divert
The Debian installer could be a lot quicker. When we install more than 2000 packages in Skolelinux / Debian Edu using tasksel in the installer, unpacking the binary packages take forever. A part of the slow I/O issue was discussed in bug #613428 about too much file system sync-ing done by dpkg, which is the package responsible for unpacking the binary packages. Other parts (like code executed by postinst scripts) might also sync to disk during installation. All this sync-ing to disk do not really make sense to me. If the machine crash half-way through, I start over, I do not try to salvage the half installed system. So the failure sync-ing is supposed to protect against, hardware or system crash, is not really relevant while the installer is running.
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