I am trying to determine if a problem I am experiencing is a bug or if
there is something I am missing. Last week I found that 15GB of my
32GB RAM was used by shared memory, causing my system to fill swap.
After about 1hr of trying to discover the reason for this, the only
thing I could find was that `df` was indicating that space was being
used by tmpfs mounted on /tmp, but I could not find files that came
anywhere close to this size.
Now I am inspecting my system after a few days of uptime and have
found that shared memory is slowly growing again. It's currently up to
almost 4GB:
jmetzmeier@localhost:/tmp $ free -m
total used free shared buff/cache available
Mem: 32065 9493 2185 3920 20386 18204
Swap: 8191 2114 6077
When I check df, what's reported as used on /tmp is pretty close to my
shared memory usage:
jmetzmeier@localhost:/tmp $ df -hT /tmp
Filesystem Type Size Used Avail Use% Mounted on
tmpfs tmpfs 16G 3.5G 13G 22% /tmp
However, `du` does not show 3.5GB of files inside:
jmetzmeier@localhost:/tmp $ sudo du -sh ./
32K ./
Does anyone know what could be happening here? Does writing a file to
tmpfs and then deleting it cause the tmpfs to retain that allocated
memory until reboot?
My system is running Fedora 34. I have ensured nothing is mounted over
top of /tmp and hiding files.
Thanks,
Jordan Metzmeier
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