Hp Insight Management Agents User Manual download pdf (Page 121)

between the values observed in the last two samples, divided by the duration of the sample

interval.

• Pages Input/sec—Number of pages read from disk to resolve hard page faults. Hard page

faults occur when a process requires code or data that is not in its working set or elsewhere

in physical memory, and must be retrieved from disk. This counter was designed as a primary

indicator of the faults that cause system-wide delays. It includes pages retrieved to satisfy faults

in the file system cache (usually requested by applications) and in non-cached mapped memory

files. This counter counts numbers of pages, and can be compared to other counts of pages,

such as Memory: Page Faults/sec, without conversion. This counter displays the difference

between the values observed in the last two samples, divided by the duration of the sample

interval.

• Pages Output/sec—Number of pages written to disk to free up space in physical memory.

Pages are written back to disk only if they are changed in physical memory, so they are likely

to hold data, not code. A high rate of pages output might indicate a memory shortage.

Windows NT writes more pages back to disk to free up space when physical memory is in

short supply. This counter counts numbers of pages, and can be compared to other counts of

pages, without conversion. This counter displays the difference between the values observed

in the last two samples, divided by the duration of the sample interval.

• Page Reads/sec—Number of times the disk was read to resolve hard page faults. Hard page

faults occur when a process requires code or data that is not in its working set or elsewhere

in physical memory, and must be retrieved from disk. This counter was designed as a primary

indicator of the kinds of faults that cause system-wide delays. It includes reads to satisfy faults

in the file system cache (usually requested by applications) and in non-cached mapped memory

files. This counter counts numbers of read operations, without regard to the numbers of pages

retrieved by each operation. This counter displays the difference between the values observed

in the last two samples, divided by the duration of the sample interval.

• Page Writes/sec—Number of times pages were written to disk to free up space in physical

memory. Pages are written to disk only if they are changed while in physical memory, so

they are likely to hold data, not code. This counter counts write operations, without regard

to the number of pages written in each operation. This counter displays the difference between

the values observed in the last two samples, divided by the duration of the sample interval.

• Page Faults/sec—Overall rate at which the faulted pages are handled by the processor. It is

measured in numbers of pages faulted per second. A page fault occurs when a process

requires code or data that is not in its working set (its space in physical memory). This counter

includes both hard faults (those that require disk access) and soft faults (where the faulted

page is found elsewhere in physical memory). Most processors can handle large numbers of

soft faults without consequence. However, hard faults can cause significant delays. This counter

displays the difference between the values observed in the last two samples, divided by the

duration of the sample interval.

• Cache Bytes—Sum of the System Cache Resident Bytes, System Driver Resident Bytes, System

Code Resident Bytes, and Pool Paged Resident Bytes counters. This counter displays the last

observed value only; it is not an average.

• Cache Faults/sec—Number of faults, that occur when a page sought in the file system cache

is not found and must be retrieved from elsewhere in memory (a soft fault) or from disk (a hard

fault). The file system cache is an area of physical memory that stores recently used pages of

data for applications. Cache activity is a reliable indicator of most application I/O operations.

This counter counts the number of faults, without regard for the number of pages faulted in

each operation.

• Pool Nonpaged Bytes—Number of bytes in the nonpaged pool, an area of system memory

(physical memory used by the operating system) for objects that cannot be written to disk, but

must remain in physical memory as long as they are allocated. Memory: Pool Nonpaged

Bytes is calculated differently than Process: Pool Nonpaged Bytes, so it might not equal Process:

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