What's the easiest way to display system cpu, memory, # drives/size ?? Post: 17209

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Top Forums UNIX for Advanced & Expert Users What's the easiest way to display system cpu, memory, # drives/size ?? Post 17209 by AtleRamsli on Tuesday 12th of March 2002 07:31:57 AM

03-12-2002

Registered User

There you probably have the only real way to do it.
I have never seen that SunOS stuff on any other system, and if I should vote between that and GNU /proc, I'd vote for the latter.

But in dmesg you find what the system found, and dmesg is on all systems I know about.

Could you tell us what you want this information for?

These are the commands I found that deal with some of this:

uname - Will tell you about the system name
top - You may parse some of this stuff and
draw inferences from it
df - This tells you about drives and free
space (parse for NFS mounts!)

To determine system speed, you have to make a small program, I guess.
Time a loop or something, maybe invalidate the cache inside the loop, determine what you want as criterion, and divide that by the time it took to run.

double d, dd;
long i;
long t = (long)time();
d = (double) t;
for (i=0; i < LOOPCNTR; i++)
invalidate_cache();
t = (long) time();
dd = (double) t;

time_it_took = dd - d;

system_speed = criterion / time_it_took;

You could fork one for each 'suspected' process and time it again. With a few if's - like each new process is given a new processor, you may infer the number of processor by multiplying time_it_took by the number of forks and compare.

This is a BFAMI(*) approach that might work.

Physical memry can be determined with a

long *p = 0;
while(p++);

loop that evenually will seqfault.
Trap that, and check the count.
Another BFAMI approach.

A structured approach is write to the POSIX guys and tell them: "Hey, I think we need a portable way of determining the system configuration, like CPUs, memory, disks, etc."

Maybe they'll listen.

Write an RFC.

Pray.

Atle

(*)(BFAMI = brute-force-and-massive-ignorance)

AtleRamsli

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LEARN ABOUT NETBSD

cpuset_size

CPUSET(3)						   BSD Library Functions Manual 						 CPUSET(3)

NAME

     cpuset_create, cpuset_destroy, cpuset_zero, cpuset_set, cpuset_clr, cpuset_isset, cpuset_size -- dynamic CPU sets

SYNOPSIS

     #include <sched.h>

     cpuset_t *
     cpuset_create(void);

     void
     cpuset_destroy(cpuset_t *set);

     void
     cpuset_zero(cpuset_t *set);

     int
     cpuset_set(cpuid_t cpu, cpuset_t *set);

     int
     cpuset_clr(cpuid_t cpu, cpuset_t *set);

     int
     cpuset_isset(cpuid_t cpu, const cpuset_t *set);

     size_t
     cpuset_size(const cpuset_t *set);

DESCRIPTION

     This section describes the functions used to create, set, use and destroy the dynamic CPU sets.

     This API can be used with the POSIX threads, see pthread(3) and affinity(3).

     The ID of the primary CPU in the system is 0.

FUNCTIONS

     cpuset_create()
	      Allocates and initializes a clean CPU-set.  Returns the pointer to the CPU-set, or NULL on failure.

     cpuset_destroy(set)
	      Destroy the CPU-set specified by set.

     cpuset_zero(set)
	      Makes the CPU-set specified by set clean, that is, memory is initialized to zero bytes, and none of the CPUs set.

     cpuset_set(cpu, set)
	      Sets the CPU specified by cpu in set.  Returns zero on success, and -1 if cpu is invalid.

     cpuset_clr(cpu, set)
	      Clears the CPU specified by cpu in the CPU-set set.  Returns zero on success, and -1 if cpu is invalid.

     cpuset_isset(cpu, set)
	      Checks if CPU specified by cpu is set in the CPU-set set.  Returns the positive number if set, zero if not set, and -1 if cpu is
	      invalid.

     cpuset_size(set)
	      Returns the size in bytes of CPU-set specified by set.

SEE ALSO

     affinity(3), pset(3), sched(3), schedctl(8), kcpuset(9)

HISTORY

     The dynamic CPU sets appeared in NetBSD 5.0.

BSD
								 November 2, 2011							       BSD