On 9/1/2023 10:05 AM, Tom Brennan wrote:
Beyond that, I have no idea how this works, or what workloads could benefit from it.
There are always things that suspend the instruction stream -- for example a cache miss that requires a cache line be loaded from memory.
While one thread is suspended this way, the other thread can utilize the core to run instructions.
On our system, we have observed zIIP cores set to MT=2 running at about 133% (YMMV).
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