Paul Jackson wrote:
The fair sharing model (such as in CKRM) that strives for maximum utilization of resources respecting priorities and min/max limits is (I suppose) quite useful for certain workloads and customers. The hardwall NUMA placement model (such as in cpusets) that strives for maximum processor and memory isolation between jobs, preferring to leave allocated resources unused rather than trying to share them, is also quite useful for some. Customers with 256 thread, one or two day long run time, -very- tightly coupled huge OpenMP Fortran jobs that need to complete within a few percent of the same time, every runtime, demand it.
Hypothetically, if you can guarantee that those threads get a specified amount of time, but may possibly get *more* cpu time and thus finish faster, what's the problem?
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