Danes ponoči se mi je iMac spet zbudil in ko sem vstal so ventilatorji delali s polno močjo (ker me je tudi zbudilo). Bil sem presenečen, kajti, kot prvo se sploh ne bi smel zbuditi sam od sebe, kot drugo pa sem preden sem ga dal v spanje ugasnil skoraj vse programe. Pogledal sem In res so tekli samo Safari (brez odprtih oken), Finder in Activity monitor. Pogledal sem v Activity monitor in ugotovil da 90% procesorske moči pokuri proces imenovan update, ki je tekel pod uporabnikom root. Se vam kaj sanja kaj ta proces počne, zakaj zbuja mojega iMaca in kako to preprečiti?

to pravi manual file:
UPDATE( BSD System Manager's Manual UPDATE(

NAME
update -- flush internal filesystem caches to disk frequently

SYNOPSIS
update [normal_interval [save_energy_interval]]

DESCRIPTION
The update command helps protect the integrity of disk volumes by flush-
ing volatile cached filesystem data to disk at thirty second intervals.
Update uses the sync(2) function call to do the task. The normal_inter-
val and save_energy_interval can be used to set the sync(2) interval in
seconds of the normal case and the case where the computer is trying to
save energy.

Update is commonly invoked at startup time by rc( when the system goes
multi-user.

SEE ALSO
sync(2), fsck(, init(, rc(, sync(

BUGS
It is possible on some systems that a sync occurring simultaneously with
a crash may cause file system damage. See fsck(.

HISTORY
An update command appeared in Version 6 AT&T UNIX.

BSD April 19, 1994 BSD
(END)


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