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Top Forums Programming How can I get a processor's CPU Percentage? Post 8672 by Perderabo on Tuesday 16th of October 2001 11:24:11 AM
Old 10-16-2001
Kernels always have some code built in to gather statistics. In the case of cpus, several times a second a clock routine fires off and increments one element of a structure. The structure will have counters for idle, user, system, and so on.

In the old days, you could get the structure if you knew its name. You would run nlist(3) on the kernel's symbol table to get the address of the structure. Then you opened /dev/kmem. did a seek to the address and read the structure. The c definations of the structures were usually in /usr/include. This still can be made to work on hp-ux, but the required information is no longer supplied in /usr/include. Skilled gurus can reverse-engineer it, but it's difficult. Vic Able has done this to get lsof to work on recent versions of HP-UX, a feat that very few could match.

New system calls like pstat are the way of the future. And pstat works well enough. Why do you want an alternative?
 

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nlist_ia(4)						     Kernel Interfaces Manual						       nlist_ia(4)

NAME
nlist_ia: nlist, nlist64 - structure formats for Integrity systems SYNOPSIS
Remarks The exact content of the structure defined below can be best found by examining It varies somewhat between various HP-UX implementations. This manpage describes on Integrity systems. For on PA-RISC systems, see nlist_pa(4). DESCRIPTION
and can be used to extract information from the symbol table in an object file (see nlist(3C)). They are basically the same tool, and both can process SOM and Elf files. Since symbol tables are machine dependent (as defined in each implementation's copy of a header file, is defined to encapsulate the differences. The nlist function, either or when used with the corresponding nlist structure, can be used to extract certain information about selected symbols in the symbol table. The data associated with each symbol is machine specific, thus only the name and position of the field in the function is standardized by HP-UX. The rest of the structure includes at least the value and type of the symbol. The names and meanings of all fields not standardized will change no more than necessary. The structure is the same as the structure and is used for source compatibility purposes. SEE ALSO
nlist(3C), a.out(4). Integrity Systems Only nlist_ia(4)
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