What ever happened to Tandem and NonStop OS 2109

depending on the system structure. much of the performance modeling and workload profiling that was pioneered at the science center

is what eventually evolved into capacity planning

we got cp67 (and then vm370) tuned to the point ... a lot of it was the rewrites i had done for i-o subsystem, paging, replacement algorithms, dispatching, and scheduling ..

at 100 percent cpu utilization and essentially immediate interactive response.

systems that have difficulty doing dynamic resource allocation well ... have problems handling instantaneous service requests. A lot of real-world environments can be very bursty types of activity. if you have difficulty doing dynamic resource allocation well ... the only method of handling bursty activity is operating with significant amount of spare headroom.

it helps being able to do well balanced system configuration ... not only system structures and opertaion ... but also decent job of balanced hardware configuration.

note however this aspect can be constantly changing based on combination of workload and advances in hardware. dynamic adaptive resource managerment can be interesting across a wide range of workloads and hardware configurations. part of this may sometimes covered as gradeful degradation under stress conditions.

for instance the following theme is about typical hardware configurations where cpu and real storage resources increases by a factor of 50 times ... but disk thruput only increased by a factor of 5 times (relative system disk thruput decreased by an order of magnitude in the period). as more and more systems became primarily disk bottleneck rather than processor bottleneck (over this period), optimizing disk I-O (including caching) became more and more important. or evant concepts s Micros?

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