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Tuning Unix server memory - HPUX11i

 
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# 1  
Old 05-30-2006
Tuning Unix server memory - HPUX11i
Hello,

I'm using a unix server (HP rp2450) which has : 2 Go RAM memory and 4 Go swap.

Code:
Here is the result of vmstat -n command :

$ vmstat -n
VM
       memory                     page                          faults
     avm    free   re   at    pi   po    fr   de    sr     in     sy    cs
  221490    6212   94   15     9    2     0    0    19    761  22360   846
CPU
    cpu          procs
 us sy id    r     b     w
 10 10 80    1     7     0
 10  9 82


Here is the result of swapinfo -t command :

# swapinfo -t
             Kb      Kb      Kb   PCT  START/      Kb
TYPE      AVAIL    USED    FREE  USED   LIMIT RESERVE  PRI  NAME
dev     4194304 1627252 2567052   39%       0       -    1  /dev/vg00/lvol2
reserve       - 1302196 -1302196
memory  1572828  521864 1050964   33%
total   5767132 3451312 2315820   60%       -       0    -

Here is the result of top command :

Memory: 1466396K (329944K) real, 3250104K (744220K) virtual, 22920K free  Page# 1/30

The server is not overloaded at this time. Around 50% of maximum activity.
I have seen that even when load is very low, po is always 2 with vmstat command.

Is the server swapping ? Do I need to add RAM memory ? How much ?

Thank you.
Last edited by Perderabo; 05-30-2006 at 04:12 PM.. Reason: Add code tags for readability
# 2  
Old 05-30-2006
Yes

Your server swapping.
You can add more memory or you can research some application tunning if you are working with Oracle, J2EE servers or like tunable app.

Regards
# 3  
Old 05-30-2006
A single line of vmstat is not very useful. Even "vmstat -n 1 4" would provide a few more clues. But swapinfo is helpful. You are using 60% of 5.7 GB or about 3.4 GB. If you double your 2GB of physical memory to 4 GB, all of that would fit. How much benefit this would mean depends on how much paging is happening and there is no way to tell with only a single line of vmstat.

Despite the name, "swap area", HP-UX never swaps anymore. It pages and deactivates.
# 4  
Old 05-31-2006
OK and thank you.
I will run wmstat -n 1 4 this afternoon when server load is more significant.
Il will post the result to you.
# 5  
Old 05-31-2006
Here is a sample with vmstat -n 1 4 :

Code:
# vmstat -n 1 4 
VM 
       memory                     page                          faults 
     avm    free   re   at    pi   po    fr   de    sr     in     sy    cs 
  212336    7285   94   15     9    2     0    0    19    762  22203   847 
CPU 
    cpu          procs 
 us sy id    r     b     w 
 10 10 80    1     5     0 
 10  9 82 
  212336    7261  180    5   160  438    21    0  3837   2414  12112  1113 
 17 20 63    1     5     0 
 16 22 61 
  212336    7689  311   17   154  350    16    0  3095   2255  12330  1090 
 13  4 84    1     5     0 
 12  6 82 
  212336    7427  357   23   143  280    12    0  2477   2094  11405  1073 
  8 12 80    1     5     0 
  7  5 88

Is it more clear for you ?
Last edited by Perderabo; 05-31-2006 at 02:08 PM.. Reason: Add code tags for readability
# 6  
Old 05-31-2006
Yeah. The system is working moderately hard at paging and could benefit from more memory. You need to decide if the performance was acceptable during this period. If not, doubling your memory would be the obvious thing to do.

You might have /opt/perf/bin/glance depending on which os bundle you bought. If so, give it a try. It is a very good performance tool.
 
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