Messages in this thread | | | From | Christoph Rohland <> | Subject | Re: Is /dev/shm needed? | Date | 17 Dec 2001 09:19:01 +0100 |
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Hi RaúlNúñez,
On Mon, 17 Dec 2001, RaúlNúñez de Arenas Coronado wrote: > Hello Robert :) > >>It is not needed. /dev/shm mounted with tmpfs is only needed for >>POSIX shared memory, which is still fairly rare. > > That this means that I can mount more than one 'tmpfs' just like > if it's a *real* filesystem? I wasn't sure, since it's implemented > thru the page cache.
Yes, every single mount is an independant tree.
>>It is dynamic, so you don't need to specify a size. > > Yes, I knew, I meant the maximum size. I don't want half of the > RAM occupied just by a programming mistake ;)))
What I like most about /tmp in tmpfs is the ability to resize on the fly: I have a big swap partition and a reasonable limit for /tmp and /var/tmp.
When one of these gets full I can either stop the affending job or increase the limit: If there is swap left I can simply increase the limit. If swap is full I add a swap file on a real filesystem and increase the limit.
Greetings Christoph
P.S: Documentation/filesystems/tmpfs.txt is in the 2.4.17-rc patch.
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