Virtual machine control method and virtual machine system
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United States of America Patent
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-
Sep 3, 1996
Grant Date -
N/A
app pub date -
Sep 14, 1993
filing date -
Sep 16, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A virtual machine control method for a supercomputer enables a plurality of virtual machines to use a vector processor. Control of the use of the vector processor is through the scalar processor. When a virtual machine requires use of the vector processor, it is first determined whether one of the other virtual machines operating systems is using the vector processor. If not, the scalar processor is dispatched to the operating system requesting use of the vector processor. If another virtual machine operating system is using the vector processor, then the operating system requesting use of the vector processor is placed in a wait state until the vector processor becomes free, whereupon the scalar processor is dispatched to the operating system that had been in the wait state. The condition of the vector processor being free can be communicated directly to the scalar processor without the intervention of the virtual machine monitor.
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