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Full Discussion: Paging is filling up while physical mem still available
Operating Systems AIX Paging is filling up while physical mem still available Post 302932175 by denissi on Monday 19th of January 2015 04:45:19 PM
Old 01-19-2015
Paging is filling up while physical mem still available
Hi, Paging on one of my boxes has been bloating up while physical memory is still available.

Avg Phys Mem - 85% (of 96GB)
Avg Paging: - 55% (of 24GB)

Last week, the box ran out of paging while physical memory still reported 84% usage. Any idea what I'm missing out here?

-------------

Code:
# svmon -G
               size       inuse        free         pin     virtual   mmode
memory     25165824    20297380     4868444     1692023    21262591     Ded
pg space    6291456     3429359

               work        pers        clnt       other
pin          927495           0           0      764528
in use     19824643           0      472737

PageSize   PoolSize       inuse        pgsp         pin     virtual
s    4 KB         -     1790004      415151      975159     1707551
m   64 KB         -     1156711      188388       44804     1222190

---------- Post updated at 04:45 PM ---------- Previous update was at 04:36 PM ----------

P.S. It's a DB server.

DB has been moved to secondary node for now.. here's a few more #s:

Code:
# vmstat -vs
           5171723696 total address trans. faults
              7729177 page ins
             15206379 page outs
               360343 paging space page ins
               883997 paging space page outs
                    0 total reclaims
           3003046207 zero filled pages faults
                72777 executable filled pages faults
             15551550 pages examined by clock
                    0 revolutions of the clock hand
              6490478 pages freed by the clock
              4487540 backtracks
              1222201 free frame waits
                    0 extend XPT waits
              1282211 pending I/O waits
             14715327 start I/Os
              8489466 iodones
           4814472187 cpu context switches
           1334053939 device interrupts
             87866885 software interrupts
           1599354307 decrementer interrupts
                40109 mpc-sent interrupts
                40109 mpc-received interrupts
            557917974 phantom interrupts
                    0 traps
          61863738225 syscalls
             25165824 memory pages
             24386800 lruable pages
             19325298 free pages
                    5 memory pools
              1689051 pinned pages
                 80.0 maxpin percentage
                  3.0 minperm percentage
                 90.0 maxperm percentage
                  1.7 numperm percentage
               415243 file pages
                  0.0 compressed percentage
                    0 compressed pages
                  1.7 numclient percentage
                 90.0 maxclient percentage
               415243 client pages
                    0 remote pageouts scheduled
                31352 pending disk I/Os blocked with no pbuf
                24185 paging space I/Os blocked with no psbuf
                 2228 filesystem I/Os blocked with no fsbuf
                    0 client filesystem I/Os blocked with no fsbuf
                 2981 external pager filesystem I/Os blocked with no fsbuf
                 21.6 percentage of memory used for computational pages

 

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LEARN ABOUT BSD

mem

MEM(4)							     Kernel Interfaces Manual							    MEM(4)

NAME

       mem, kmem - main memory

SYNOPSIS

       major device number(s):
	    raw: 1
       minor device encoding:
	    mem: 0;  kmem: 1;  null: 2

DESCRIPTION

       Mem is a special file that is an image of the main memory of the computer.  It may be used, for example, to examine (and even to patch) the
       system.

       Byte addresses in mem are interpreted as physical memory addresses.  References to non-existent locations cause errors to be returned.

       The file kmem is the same as mem except that kernel virtual memory rather than physical memory is accessed.  Only kernel virtual  addresses
       that  are  mapped to memory are allowed.  Examining and patching device registers is likely to lead to unexpected results when read-only or
       write-only bits are present.

       On PDP-11s, the I/O page begins at location 0160000 of kmem and the per-process data segment for the current process begins at 0140000  and
       is USIZE clicks (64 bytes each) long.

FILES

       /dev/mem
       /dev/kmem
       /dev/MAKEDEV	   script to create special files
       /dev/MAKEDEV.local  script to localize special files

BUGS

       On PDP-11's, specifying an odd kernel or user address, or an odd transfer count is [generally] slower than using all even parameters.

       On machines with ENABLE/34(tm) memory mapping boards the I/O page can be accessed only through kmem.

3rd Berkeley Distribution					 January 28, 1988							    MEM(4)
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