I was however intrigued by this heavy load of the system, with very
little CPU use (which means unefficient computation).
Actually, lapw2 routines are still blocked for some I/O most of the
time. This I/O is however no longer a physical reading from the hard
disk (and so does not show up in the observation of the disk activity,
as reported above): these routines spend most of their time reading from
the .vector files (known from a strace command), but this must have been
cached in the memory, this time. In my case, the .vector files are ~ 9
Gb large.
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