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.