Red Hat NETSCAPE MANAGEMENT SYSTEM 4.5 User Manual Page 235

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Resource Management
235
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running on the server so the console operating system’s 1,000 shares represent a
greater or smaller proportion of the total.
Shares are not hard partitions or reservations, so underutilized allocations are not
wasted. Instead, inactive shares are effectively removed from consideration, allowing
active virtual machines to benefit when extra resources are available.
Multiprocessor Systems
In multiprocessor systems, you can also restrict the assignment of virtual machines to
a subset of the available processors by specifying an affinity set for each virtual
machine. The system automatically assigns each virtual machine to a processor in the
specified affinity set in order to balance the number of active shares across processors.
If the affinity set contains only a single processor, then the virtual machine is placed
there.
Any one virtual machine is assigned to only one processor. And the guest operating
system sees a virtual machine with a single processor.
The current release allows CPU shares and affinity sets to be specified and modified
dynamically at any time using a simple procfs interface or using the VMware
Management Interface. Initial values for a virtual machine may also be specified in its
configuration file.
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