Later releases work well with multiple CPUs in Hercules (n-1),
On Thu, Nov 21, 2024 at 12:29?PM Sterling Garwood via groups.io
<slgarwood@...> wrote:
I have always been suspicious of Hercules/Herculon in the area of multiprocessors. My rule of thumb is to run one cpu (the Gene Amdahl model). The whole interaction of MVS MP, Hercules support of MP, and how it interacts with the underlying hardware if it has multiple processors seems to me to be an unnecessary complication and everything has to work right. No bugs in MVS MP support (ya sure), no bugs in Hercules and its bolted on MP support, and no bugs in the underlying system (again - ya sure). I have run OSX and Linux and seen different types of strange problems pop up in both cases. Now throw in Apple Silicon and Power and Efficiency cores. Too much to mess with unless you have never spent a weekend in an MVS data center recovering a JES3 complex and want to see how that feels - I have (or used to).
The issues I have seen over the years seem to me to be an unnecessary complication. If I want to pump more work I just duplicate a UP and run either JES2 shared spool or JES3.
Just my 2 cents worth. From an old grey beard.
--
Mike A Schwab, Springfield IL USA
Where do Forest Rangers go to get away from it all?
