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PASE and IBM i are joined at the hypervisor level in the SLIC, and below
that at the Power chip level. Otherwise they are quite separate. PASE runs
on top of the "syscall" interface, while IBM i runs on top of the
"technology independent machine interface". PASE does not receive the
benefits of single-level store, nor the assurance that your applications
will run on new hardware.
Below the SLIC, the hypervisor switches between two distinct processor
modes, one for running PASE workloads, and another for running IBM i
workloads. The "switching" is comparable to that which results from having
multiple partitions running simultaneously.
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