HP Insight Control - Manual (Page 48)

processors. In this case, the total processor time percentage is the average of the loads on each
processor.
•
Busiest Processor Utilization %—The average utilization of the logical processor with the
highest utilization. This value is equal to the Average Processor Utilization % if the server is
using one processor core.
•
Processor Busy %—The percentage of time that the processor is executing a non-idle thread.
•
Context Switches/Sec—The number of thread context switches at which all processors on the
server are switched from one thread to another each second. Context switches occur when a
running thread voluntarily relinquishes the processor, is preempted by a higher-priority ready
thread, or switches between user mode and privileged (kernel) mode to use a subsystem
service.
•
Interrupts/Sec—The average number of hardware interrupts the processor is receiving and
servicing each second.
Average Processor Utilization % and Highest Processor Utilization % are used to determine processor
performance.
Processors Inventory
•
Processor Support—Lists the number of processors supported by the server
•
Processors—Displays the number of processors installed on the server and a summary of the
processors (type, speed, and cache size)
Memory
The following information is provided for memory.
Memory Status
•
Available MBytes—The amount of memory that is not currently allocated to any process or is
unused. A low Available MBytes value can indicate memory allocation bottlenecks.
•
Page Reads/Sec—The number of times the disk was read to retrieve pages of virtual memory
necessary to resolve page faults each second. Multiple pages can be read during a single
disk read operation.
•
Pages Input/Sec—The number of pages read from the disk to resolve memory references to
pages that were not in memory at the time of the reference. This counter includes paging traffic
on behalf of the system cache to access file data for applications. It is important to observe
this counter if you are concerned about excessive memory usage, or thrashing, and the
excessive paging that can result.
•
Page Faults/Sec—The average number of page faults each second. A page fault occurs when
a process refers to a virtual memory page that is not in its working set in main memory. A
page fault does not cause the page to be fetched from disk if that page is on the standby list
and is already in main memory or if it is in use by another process with which the page is
shared. There are two types of page faults:
◦ Hard Page Fault—The most expensive in terms of system resource usage, occurring when
a missing page must be retrieved from the disk
◦ Soft Page Fault—Generally not considered a source of memory bottlenecks, occurring
when the missing page is not in the current working set but is located elsewhere in memory
and easily brought into the working set
•
Hard Page Faults %—The ratio of page faults per second to pages input per second. This
value is a primary indication of memory bottlenecks.
Memory performance is determined primarily by the rate at which memory is swapped out to disk.
Page Reads/Sec is the primary factor in determining memory performance issues, but the Hard
Page Faults % and Available MBytes are also considered.
48 Measurement parameter matrix