GPT vs MBR for swap devices

[bob prohaska]

On Thu, Jun 14, 2018 at 09:53:57AM -0700, Rodney W. Grimes wrote:
> 
> I would be very interested in seeing if resizing the swap partition
> in the example that greatly exceeds what the system expects as a
> max total swap helps to bring the OOM issue under control.
> 
The swap partitions at my immediate disposal are
1 GB USB flash
1 GB microSD flash
2 GB microSD flash
3 GB USB mechanical

What combination is apt to be most informative? My original intent
was to use 1 GB USB flash plus 1 GB microSD flash in hopes of a speed
gain from interleaving, but maybe that's no longer realistic. Anything
over 3 GB total causes the "too much swap" warning and I've never observed
more than about 1.2 GB of swap in use.

 


> I think the state of things is such that if you use up the
> max usable swap space on the first swap device, only that
> swap device well ever be used.  I do not believe there is
> any attempts what so ever to split the allocation up so
> that you use the first fraction of each device.
> 

Swap usage seem to be spread among active partitions, though 
how they're weighted is unclear to me. In days of yore there
was a little note about "interleaved" in swapinfo reports, but
I don't recall seeing that for a loong time. Maybe that feature
has gone away.....

Thanks for reading,

bob prohaska