testing SSD performance

[Warren Block]

On Fri, 18 Nov 2016, Christoph P.U. Kukulies wrote:

> I was running an older FreeBSD (9.2) for quite a while now with the root FS 
> (and swap) an an SSD drive (100GB).
>
> While upgrading the system to 11.0 and while observing quit elong buildworld 
> times I'm wondering myself if my SSD possibly might have gotten degraded
> some extent.

buildworld is mostly just CPU bound.  I remember comparing it between 
hard disk and SSD and finding an amazingly small difference.

The buildworld process in 11.0 and later is just much slower.  Some of 
that can be reduced by not building the LLDB debugger by setting 
WITHOUT_LLDB=yes in /etc/src.conf.

> I've read that SSD tend to run slow on writes over time, 
> especially when no provisions were taken to e.g. fill them up just up to 2/3 
> of their max capacity to leave room for firmware storage management.

It's possible that is the cause, but unlikely.