[gentoo-user] Disk usage during emerge

[Frank Steinmetzger <Warp_7@gmx.de>]

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Hello list

It came to my attention that during (after) an emerge run, df reports
considerably less space available on my / than before the emerge (everything
except /home sits on the root partition). I was wondering how this comes to
be, since I have /var/tmp/portage on tmpfs.

I am in the middle of a KDE upgrade (4.8.0→4.8.1) right now and before I
started, I downloaded all distfiles and then looked at df /, it showed 1022
blocks, hence about 1 GB of free disk space. I am at package 115 out of 174
right now, and df shows a mere 389k blocks remaining.

Also before I began the emerge run, I started 'ncdu -x /' which scans all dirs
on the / partition and then I can browse through my FS hieararchy, showing the
disk usage of every directory. Now I ran the same ncdu command again in
another screen, so I can compare it with the first one.

The folders themselves have 0.1 to 0.2 GB difference between their old and new
state, and ncdu's bottom bar even shows the same values for both apparent and
real total disk usage (rounded to 0.1 GB). So what am I missing here? I
searched df's man page for something about apparent sizes/sparse files, but
then again, why would portage create such files in the first place?

Do you have any thoughts that might help me understand what I'm seeing?
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