An Analytic Model of the Hasp Execution Task Monitor

The HASP Execution Task Monitor periodically
rearranges the OS/360 dispatching chain to give 
tasks preemptive execution priority in inverse order to
that of their cpu utilization history.  The effect 
is to keep the I/O bound tasks active and to prevent
cpu bound tasks from locking out other tasks.  This 
paper develops a simple model of the Execution Task
Monitor and employs it to study the effectiveness 
of the monitor in improving system performance.  A
modified strategy monitor control is investigated 
for the case of task execution in a memory hierarchy of varying speeds.

CACM December, 1974

Strauss, J. C.

Hasp, OS/360, dispatching, scheduling, modeling, performance evaluation

4.32 8.1

CA741203 JB January 16, 1978  9:51 AM

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