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Full Discussion: vmstat -P (physical memory)
Top Forums UNIX for Advanced & Expert Users vmstat -P (physical memory) Post 302068832 by gfhgfnhhn on Tuesday 21st of March 2006 07:40:11 AM
Old 03-21-2006
Error vmstat -P (physical memory)
vmstat -P commands gives me an output as shown at the end of this message.

my first question is about the difference between "total physical memory" and "total physical memory use"

"Total Physical Memory" -"Total Physical Memory Use"
524288 pages-524026 pages= 262 pages

does it mean that 262 pages are free?
if they are not free, this pages are used for what?
if they are free what relation exist between these pages(262 pages) and
the free pages = 18540 (which are mentioned in the
"Managed Pages Break Down" part)

my second question is:
whats the relation between total physical memory(here it is=524288 ) and
the total memory mentioned in the "Managed Pages Break Down" part
(here it is=507442 pages)


vmstat -P output:
***********************

Total Physical Memory = 4096.00 M
= 524288 pages

Physical Memory Clusters:

start_pfn end_pfn type size_pages / size_bytes
0 256 pal 256 / 2.00M
256 130985 os 130729 / 1021.32M
130985 131072 pal 87 / 696.00k
131072 524282 os 393210 / 3071.95M
524282 524288 pal 6 / 48.00k

Physical Memory Use:

start_pfn end_pfn type size_pages / size_bytes
256 289 scavenge 33 / 264.00k
289 1143 text 854 / 6.67M
1143 1306 data 163 / 1.27M
1306 1535 bss 229 / 1.79M
1535 1745 kdebug 210 / 1.64M
1745 1753 cfgmgmt 8 / 64.00k
1753 1755 locks 2 / 16.00k
1755 1769 pmap 14 / 112.00k
1769 4537 unixtable 2768 / 21.62M
4537 4633 logs 96 / 768.00k
4633 7781 vmtables 3148 / 24.59M
7781 131072 managed 123291 / 963.21M
131072 140077 vmtables 9005 / 70.35M
140077 524282 managed 384205 / 3001.60M
============================
Total Physical Memory Use: 524026 / 4093.95M

Managed Pages Break Down:

free pages = 18540
active pages = 170145
inactive pages = 226033
wired pages = 61434
ubc pages = 31290
==================
Total = 507442

WIRED Pages Break Down:

vm wired pages = 28726
ubc wired pages = 0
meta data pages = 5225
malloc pages = 18210
contig pages = 1456
user ptepages = 7316
kernel ptepages = 491
free ptepages = 10
==================
Total = 61434

***********************
***********************
 

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LEARN ABOUT CENTOS

get_phys_pages

GET_PHYS_PAGES(3)                                            Linux Programmer's Manual                                           GET_PHYS_PAGES(3)

NAME

       get_phys_pages, get_avphys_pages - get total and available physical page counts

SYNOPSIS

       #include <sys/sysinfo.h>

       long int get_phys_pages(void);
       long int get_avphys_pages(void);

DESCRIPTION

       The function get_phys_pages() returns the total number of physical pages of memory available on the system.

       The function get_avphys_pages() returns the number of currently available physical pages of memory on the system.

RETURN VALUE

       On  success,  these functions return a nonnegative value as given in DESCRIPTION.  On failure, they return -1 and set errno to indicate the
       cause of the error.

ERRORS

       ENOSYS The system could not provide the required information (possibly because the /proc filesystem was not mounted).

CONFORMING TO

       These functions are GNU extensions.

NOTES

       These functions obtain the required information by scanning the MemTotal and MemFree fields of /proc/meminfo.

       The following sysconf(3) calls provide a portable means of obtaining the same information as the functions described on this page.

           total_pages = sysconf(_SC_PHYS_PAGES);    /* total pages */
           avl_pages = sysconf(_SC_AVPHYS_PAGES);    /* available pages */

EXAMPLE

       The following example shows how get_phys_pages() and get_avphys_pages() can be used.

       #include <stdio.h>
       #include <stdlib.h>
       #include <sys/sysinfo.h>

       int
       main(int argc, char *argv[])
       {
           printf("This system has %ld pages of physical memory and "
                   "%ld pages of physical memory available.
",
                   get_phys_pages(), get_avphys_pages());
           exit(EXIT_SUCCESS);
       }

SEE ALSO

       sysconf(3)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU                                                                 2017-09-15                                                   GET_PHYS_PAGES(3)
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