On 5/09/2023 10:30 pm, Martin Packer wrote:
And “100% busy” is the wrong criterion – if you want your system to be
performant.
Isn't that what WLM is for?
25 years ago I did a WLM conversion on a single CPU system. A single CPU
is probably the most difficult to tune. By necessity, it ran at 100% for
hours at a time. With appropriate WLM settings it performed fine. You do
need a mix of work so you have work that can afford to wait, but it's
not like the system needs time to to rest. There's no major difference
between idle time and time running lower priority work.
Is the situation worse now?
There were a lot of things we had to do that went against the
conventional wisdom for WLM at the time - the conventional wisdon did
NOT work well at 100% or on a single CPU.
--
Andrew Rowley
Black Hill Software
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