Date: Fri, 21 Aug 2015 11:52:04 +0100 From: Mike Clarke <jmc-freebsd2@milibyte.co.uk> To: freebsd-questions@freebsd.org Subject: Is it really necessary to run swapoff on shutdown? Message-ID: <20150821115204.39dd7ace@curlew.lan>
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I have two 4GB swap partitions on separate drives on my desktop. By the time I shut down at the end of the day I usually have about 8% swap in use. At an early stage in the shutdown /etc/rc.d/swaplate runs and takes about one minute to run '/sbin/swapoff -aq'. On some occasions when more swap has been used swapoff has failed to complete before timing out. Perhaps I'm misunderstanding the finer details of managing swap space but I would have expected that swapoff could be omitted on shutdown. As each process shuts itself down it will retrieve any swapped out pages which it needs so by the time the last process is finished none of the remaining data in the swap space will be required by anything and can be safely discarded. Also if it really is necessary to run swapoff on shutdown should the command have also included the -L option to allow for it having been used in the swapon command. -- Mike Clarke
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