Special Features of Operating Systems 

Definition

saposcol collects data in different ways depending on the operating system.

This section outlines the various prerequisites and special features of each platform, for example, which data is collected according to the Details flag. Note that some data is not available on all platforms and is marked as N/A in the operating system monitor, or with a 0 or a 1 in dialog mode.

AIX

There are no particular prerequisites for saposcol in AIX versions up to 3.2.5. However, from AIX version 4.1, saposcol requires an IBM interface for performance data. Alternatively, you can install one of the following IBM packages:

The following descriptions apply to AIX 4.1.

Data collected according to the details flag:

Not all Top CPU consumer data is collected in the Details not required mode. The program name is displayed, not the command. Therefore, you only see disp+work instead of dw.sapC11_D00 pf=/usr/sap/C11/SYS.... .

OSF/1

Details/idle mode

In Details required mode, the command lines for the processes are displayed, otherwise only the names of the executables are displayed.

Paging

All memory space managed by the virtual memory system is paged. This means that executable code (text, bss, data), memory, shared memory, and so on is only mapped on actual pages when necessary. If a maximum number of pages is reached (default is 128 pages), then the Page stealer process is started using inactive pages (pages which have not been accessed since a specified point in time).

The swapper starts swapping whole processes if the number of free pages gets too small.

Working set size (resident set size)

This gives details of all physical pages stored in the main memory at that point in time (including pages in the shared memory). This is a variation on the SAP definition.

Windows NT

saposcol on a Windows NT operating system is generally based on the same data as the Microsoft program perfmon.exe . Similarly, saposcol can only collect data available in perfmon.exe . You must activate the function which determines the disks performance, using the Windows NT command:

diskperf -y

All data is collected, regardless of the details or idle mode.