Change /tmp size [answered]

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Change /tmp size [answered]

filesystem

asked 2016-12-05 21:43:29 +0300

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updated 2016-12-05 21:43:52 +0300

SebM
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Hi,

I need to grow the /tmp filesystem a little, how can I do that ?

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The question has been closed for the following reason "the question is answered, an answer was accepted" by SebM
close date 2016-12-06 10:39:47.928644

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you could mount a different partition/file on said mount point

till ( 2016-12-05 22:42:00 +0300 )edit

That's a good workaround but I don't a spare filesystem to do that.

My option is to grow /tmp FS,

On my Ubuntu, there is a "/etc/fstab" line for that but I don't see a "/tmp" in my "fstab" on my Jolla and still "/tmp" is there.

I wonder how it works.

SebM ( 2016-12-06 08:51:28 +0300 )edit

you could mount a different partition/file on said mount point
till ( 2016-12-05 22:42:00 +0300 )edit
That's a good workaround but I don't a spare filesystem to do that.
My option is to grow /tmp FS,
On my Ubuntu, there is a "/etc/fstab" line for that but I don't see a "/tmp" in my "fstab" on my Jolla and still "/tmp" is there.
I wonder how it works.
SebM ( 2016-12-06 08:51:28 +0300 )edit

Accepted Answer

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answered 2016-12-06 09:07:23 +0300

rinigus

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these days, /tmp is mounted usually on tmpfs. Tmpfs is RAM-based (https://en.wikipedia.org/wiki/Tmpfs) and default allocation is usually 1/2 RAM. Its a max and if is less data on the filesystem, only that part of RAM would be used.

You can in theory increase /tmp by increasing its allocation in RAM (see tmpfs mount options). However, beware that you might get too little RAM for other applications.

Alternative is to make subdir in /home and use that instead of /tmp in your programs.

There are many other alternatives that you could consider, its too many to list here and they would depend on your specific needs.

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@rinigus You are right and I know about tmpfs already.

On my ubuntu there an explicit "tmpfs" mount line for "/tmp" but here have I nothing in my Jolla fstab :

$ grep /tmp /etc/fstab
$

I just wonder how it works if it not explicitly mounted via a fstab description line.

SebM ( 2016-12-06 10:17:27 +0300 )edit

Its mounted by systemd during boot, so you have to look for systemd configs. But I think if you start even approaching to consuming 1/2 of your phone RAM, you maybe in trouble. Unless you have a phone with lots of it (3GB is a max for full-blown SFOS at present due to the non-finished 64-bit ports). I wouldn't risk to get to 1GB RAM consumption even with 2GB RAM phones - your apps may start to get killed.

You can probably make a /home/tmp dir and use that for this purpose. No mount is necessary then, just adjust permissions and point your program over there (might need to modify its source).

rinigus ( 2016-12-06 10:32:25 +0300 )edit

@rinigus Thanks a lot for your explanation :)

SebM ( 2016-12-06 10:39:10 +0300 )edit

@SebM You are welcome. Good luck!

rinigus ( 2016-12-06 10:42:22 +0300 )edit

1

alternatively you can bind-mount (eg mount -o bind /home/tmp /tmp), but beware that existing files in /tmp are no longer accessible in this case

till ( 2016-12-06 11:36:41 +0300 )edit

Change /tmp size [answered]

The question has been closed for the following reason "the question is answered, an answer was accepted" by SebM
close date 2016-12-06 10:39:47.928644

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Change /tmp size [answered]

The question has been closed for the following reason "the question is answered, an answer was accepted" by SebM close date 2016-12-06 10:39:47.928644

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The question has been closed for the following reason "the question is answered, an answer was accepted" by SebM
close date 2016-12-06 10:39:47.928644