[HEADS-UP] Rawhide: /tmp is now on tmpfs

[Brian Wheeler]

On 06/01/2012 11:35 AM, Gregory Maxwell wrote:
> Because that disk activity only happens when the kernel decides that
> it wants the memory for something else it doesn't happen at all in a
> great many cases especially for short lived files.
...
> The feature may be adopted/promoted on the basis of SSD writecycle
> preservation, but tmpfs also offers considerable performance
> improvements for workloads that create/remove files in /tmp at high
> speed— which is the reason that many people have been using tmpfs for
> /tmp on many systems for much longer than SSDs have existed.

Um, aren't both of those benefits the same as one would get when using 
ext4's delayed allocation?

Does anyone have any actual numbers for the performance increase?  I've 
never seen any numbers, but I've heard the claim repeatedly.