HP-UX vmstats

HP-UX vmstats

Post by Doug O'Lea » Tue, 04 Apr 1995 04:00:00



     I'm fairly new to the HP world; however, I'm familiar
with both SUN and IBM's versions of UNIX.  On both SUN and IBM,
the systems will page parts of processes vice swapping the whole
thing out.  I took a look at HP's vmstats here and was surprised
to see between 10 and 50 swapped out processes and plenty of free
memory.  Does HP swap out idle processes automatically?  If not,
is there a variable in the kernel configuration files which will
turn paging on?  

     Any help and/or pointers will be greatly appreciated.

Doug O'Leary

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

Litton Data Systems     Compuserv:      71620,3561

 
 
 

1. Q: HP-UX vmstat output

On HP-UX (10.x), vmstat -nS 5 shows paging/swapping every 5 seconds, as
below. On the system below, memory is moderately busy. vmstat says that
processes are being swapped but there is no paging. Why no paging?
vmstat never seems to show paging on any quiet / moderate / busy system.
Also, why are the same number of processes swapped in / out with such
regularity? And why is paging in (pi) zero? pi should at least show
demand paging as executables are started.

si=swaped in; so=swapped out; pi, po= paged in/out.
# vmstat -nS 5
VM
       memory                     page                          faults
     avm    free   si   so    pi   po    fr   de    sr     in     sy    
cs
   16272    1888 298482 298534     1    0     0    0     0    175   1580
  297
CPU
    cpu          procs
 us sy id    r     b     w
 37 12 51    1     0     0
   16582    1855    5    5     0    0     0    0     0    125    742    
97
 49  1 50    1     0     0
   18269    1792    5    5     0    0     0    0     0    119    476    
90
  3  1 96    0     0     0
   18548    1855    5    5     0    0     0    0     0    179    606    
86
  7  2 91    0     0     0
   20597    1851    5    5     0    0     0    0     0    145    389    
87

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