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Full Discussion: How can I get a processor's CPU Percentage?
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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LEARN ABOUT OSF1

pset_assign_pid

pset_assign_pid(1)					      General Commands Manual						pset_assign_pid(1)

NAME

       pset_assign_pid - Assigns a process ID to a processor set

SYNOPSIS

       /usr/sbin/pset_assign_pid [-x] pset_id pid [pid...]

OPTIONS

       Assigns exclusive use of the target processor set to each specified process identification number.

DESCRIPTION

       The  pset_assign_pid  command  assigns  one or more process identification numbers to an existing processor set.  The pset_id variable is a
       unique integer that identifies the processor set and is returned by the pset_create command. The pid variable is the process identification
       number, which is a unique integer that identifies the process. Each process identification number that is assigned is removed from its cur-
       rent processor set.

       Use the -x option to assign exclusive use of the processor set.	If the processor set is already in use, a message is  displayed,  and  the
       command	terminates  without  performing the assignment.  If the exclusive assignment succeeds, new requests by other processes for assign-
       ments to the specified processor set (pset_id) are denied.

SEE ALSO

       Commands:  pset_destroy(1), pset_create(1), pset_assign_cpu(1), pset_info(1)

       Files:  processor_sets(4)

																pset_assign_pid(1)
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