Re: [gentoo-user] aligning SSD partitions

[Philip Webb]

120904 Peter Humphrey wrote:
> On Tuesday 04 September 2012 22:00:48 Neil Bothwick wrote:
>> On Tue, 04 Sep 2012 22:31:23 +0200, Volker Armin Hemmann wrote:
>>> If PORTAGE_TMPDIR fills up no biggy, emerge dies, that's it.
>>> But /tmp filled up? Suddenly you will have lots of strange problems.
>>> Don't do it. Spare yourself some headaches.
>> Good point, maybe I should have mentioned I have a 13GB /tmp.

At the moment, after a few hours catching up with the news with FF,
my memory usage is :

               total used free shared buffers cached
  Mem:          3960  915 3044      0      63    408
  -/+ buffers/cache:  443 3516
  Swap:         3820    0 3820

Even compiling LO, it doesn't spill into swap anymore.
I assume having PORTAGE_TMPDIR on SSD wb noticeably faster than on HDD,
but how much faster still would it be to have it in memory ?
Memory is cheap & I could buy another  4 GB , it there were a reason.

> Also having 16GB RAM I've limited /tmp to 10GB.
> I wonder whether 13GB would offer any advantage.
> Unlikely, as the only time it gets used in earnest
> is when compiling Firefox, OO and the like.
> Maybe I should just remove the restriction
> and let the kernel optimise its own use of swap and tmpfs.
> This box spends well over 90% of its cycles on BOINC projects,
> which crunch large numbers of numbers but don't take up a lot of space.

What is the best line for  /etc/fstab ?  The only example I have is :

  'tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0'

This doesn't seem to limit the size in any way.

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