Re: free reports that shared memory is not used
On 2001 October 29 Monday 06:39, Michel Dänzer wrote:
> You should RTFM in the first place. ;)
point taken :-) Thanks for the info.
>From the free(1) manpage:
>
> 'The shared memory column should be ignored; it is obsolete.'
>
>
> PS: I do have the line
>
> none /dev/shm shm defaults 0 0
>
> in /etc/fstab ever since I've been running a 2.4 kernel, but I have no
> idea what this actually is for or what the effect of not having it would
> be...
I happened to read a nice article on it yesterday. It is located at
"http://www-106.ibm.com/developerworks/library/l-fs3.html";. According to the
author, CONFIG_TMPFS=y lets you use the POSIX shared memory, and you can
access a nice, ramdisk-like filesystem at /dev/shm.
I enabled this option yesterday, and observed that the swap space is used
even though there's plenty ram unused. I suppose this is how shared memory
works?
Joongul
> On Sun, 2001-10-28 at 14:23, Joongul Lee wrote:
> > Ever since I upgraded the kernel to 2.4.*, my free report looks like
> > the following:
> >
> > jlee@chaconne:~$ free
> > total used free shared buffers cached
> > Mem: 255356 240896 14460 0 3704 121232
> > -/+ buffers/cache: 115960 139396
> > Swap: 65532 988 64544
> >
> > Is there a crucial kernel option I forgot to include? My kernel option is
> > attached here...
> >
> > My pismo functions fine, but I'm curious why this is happening... My
> > apologies if this is a well-known issue already covered (I did look up
> > the archive but couldn't find related topics).
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