Reading the list yesterday I came across a little controversy about
swap backed /tmp filesystems. I've been using this in my /etc/rc.conf
tmpmfs="YES" # Set to YES to always create an mfs /tmp, NO
to never
tmpsize="1g" # Size of mfs /tmp if created
tmpmfs_flags="-S -o async,noexec" # Extra mdmfs options for the
mfs /tmp
To mount /tmp on a swap backed filesystem. I've been assuming that
data stored in the /tmp directory was held in RAM and then written to
the swap space only when the system had a more pressing need for the
RAM. I typically configure my systems with swap == 2 * RAM or more.
And on the systems in question I have at least 1Gb of RAM. I was
hoping to use this trick to enhance the performance of the postgresql
database (temp_tablespace=/tmp/pgsql/....) Is my assumption about
where the data in a temporary file is stored incorrect?
-- Chris
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