[mythtv-users] ringbuf in memory?

[Scott Harris]

Bill Williamson wrote:
> On Fri, Dec 19, 2008 at 8:26 AM, Scott Harris <scott at webhounds.net 
> <mailto:scott at webhounds.net>> wrote:
>
>     Has anyone considered, or even tried adding a lot of ram to their
>     systems
>     and using it for the ringbuf location?  I mean something like 64Gb
>     of ram.
>     For SD recording that should provide adequate space for the
>     ringbuf I think.
>
>     Just wondering.....
>
>
> -There's not a traditional ringbuffer in myth since the livetv switch 
> was made (.19?)
> -Even when there was a ringbuffer, it was never a bottleneck AFAIK.
> -Again, back when there was a ringbuffer I believe its default was 
> somewhere in the 1-4gb size.
>
> What problem is this idea trying to solve?  Having 64Gb of ram might 
> go really well if you're doing a LOT of simultanious HD recording if 
> you tune the kernel to be REALLY agressive with its disk caching, but 
> otherwise it woudln't do anything whatsoever.
>
>
While there hasn't been the traditional ringbuffer there is still the 
area that
myth still writes the live tv files to.  I was assuming that this was 
the area
where the "ringbuf" setting would write.  Since for live tv it is both 
reading
and writing the disk at the same time I was hoping that writing to something
faster than a disk would all the read/write to happen a lot faster.

But the above is a *lot* of assuming, and we all know about assuming....