Basic Question on having /tmp as tmpfs

wearetheborg · 02-23-2019, 01:49 AM

I moved over my /tmp onto RAM as indicated here:
https://askubuntu.com/questions/1730...maximum-amount

Code:

tmpfs /tmp tmpfs defaults,noatime,nosuid,nodev,mode=1777 0 0

A couple of questions: if I do not give the size option, the size is set at half the RAM. I have 32GB ram. and /tmp gets 16GB. Does this mean I now only have 16GB for standard RAM purposes? That is, even if /tmp has 1GB data, will the other 15GB not be usable as "standard RAM" space?

The other question: in the above, there is "defaults" then other options. Do the options that follow override "defaults"?

pan64 · 02-23-2019, 02:34 AM

Quote:

Originally Posted by wearetheborg

there is "defaults" then other options. Do the options that follow override "defaults"?

yes, it will take the default set of options and override the ones specified.

The real size of that tmpfs depends on the usage, I think it is dynamically allocated.

wearetheborg · 02-23-2019, 02:39 AM

Quote:

Originally Posted by pan64

yes, it will take the default set of options and override the ones specified.

The real size of that tmpfs depends on the usage, I think it is dynamically allocated.

Thanks.
When I do df-h, it gives 16GB for /tmp

syg00 · 02-23-2019, 02:49 AM

That's the default limit, not "size" as it applies to disk partitions. Read this

ondoho · 02-23-2019, 02:50 AM

Quote:

Originally Posted by wearetheborg

if I do not give the size option, the size is set at half the RAM. I have 32GB ram. and /tmp gets 16GB. Does this mean I now only have 16GB for standard RAM purposes? That is, even if /tmp has 1GB data, will the other 15GB not be usable as "standard RAM" space?

no.

btw, mine looks like this:

Code:

grep /tmp /etc/mtab
tmpfs /tmp tmpfs rw,nosuid,nodev 0 0

never had any problems with it.