I'm using a unix server (HP rp2450) which has : 2 Go RAM memory and 4 Go swap.
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
Hello,
Can someone share his experience with SCO unix server performance tuning?
- how to make some performance analysis
- how to tune up a server for better performance
Thank you! (0 Replies)
This is post number 3 in a series of unanswered "TUNING" questions. :D
With AIX 5.3 TL4, the page size can vary from the original "4k". They can now be "64k" and a couple other sizes. They also do not have to all be the same. Some can remain "4k" while others are "64k" which is what seems to... (2 Replies)
Hi,
I would like to connect UNIX server to UNIX server through shell scripts
and i have some concepts . But i am totally confused how to connect UNIX
server to UNIX server throuth running a script. It will be greatful to me if
any buddy will help me.
with simple example please.
Thanks in... (2 Replies)
We have been tuning MySQL lately and I ran accoss two useful tools that you might be interested in:
mysqltuner.pl
tuning-primer.sh
Both of these scripts are quite useful for MySQL tuning. Here is some sample output of mysqltuner.pl
>> MySQLTuner 0.9.8 - Major Hayden... (3 Replies)
Hi Gurus,
I'm a unix newbie and I would like to connect to multiple unix servers from unix server using shell script i.e from server a to server b,c,d etc. I want to copy the files from unix server a to server b, c, d. I can access staright using ssh without the need to have password and user... (5 Replies)
Hi all,
I have created a script which adding two columns and removing two columns for all files.
Filename: Cust_information_1200_201010.txt
Source Data:
"1","Cust information","123","106001","street","1-203 high street"
"1","Cust information","124","105001","street","1-203 high street"
... (0 Replies)
Hi all,
From Googling, I found that the basics used for troubleshooting UNIX/AIX performance issues are commands like vmstat, iostat and sar. I believe these are generic commands regardless of what UNIX flavour is in used, only difference being is the format of the output.
In a real case... (2 Replies)
Hi All,
Let me know how can i find and delete files from one unix server to another unix server which are 'N' days older.
Please note that I need to delete files on remote unix server.So, probably i will need to use sftp, but question is how can i identify files and folders which are 'N'... (2 Replies)
Greetings,
i'm wondering if there is a way to determine minimum memory requirement for AIX kernel and OS functions? We use memdetails script from perfpmr package to see actual memory allocation, for example like this:
===========================================================================... (5 Replies)
Discussion started by: dzodzo
5 Replies
LEARN ABOUT ULTRIX
vmstat
vmstat(1) General Commands Manual vmstat(1)Name
vmstat - report virtual memory statistics
Syntax
vmstat [ interval [ count ] ]
vmstat -v [ interval [ count ] ]
vmstat -fKSsz
vmstat -Kks namelist [ corefile ]
Description
The command reports statistics on processes, virtual memory, disk, trap, and cpu activity.
If is specified without arguments, this command summarizes the virtual memory activity since the system was last booted. If the interval
argument is specified, then successive lines are summaries of activity over the last interval seconds. Because many statistics are sampled
in the system every five seconds, five is a good specification for interval; other statistics vary every second. If the count argument is
provided, the statistics are repeated count times.
When you run the format fields are as follows:
Procs: information about numbers of processes in various states.
r in run queue
b blocked for resources (i/o, paging, and so on.)
w runnable or short sleeper (< 20 seconds) but swapped
faults: trap/interrupt rate averages per second over the last 5 seconds.
in (non clock) device interrupts per second
sy system calls per second
cs cpu context switch rate (switches/second)
cpu: breakdown of percentage usage of cpu time
us user time for normal and low priority processes
sy system time
id cpu idle time
Memory: information about the use of virtual and real memory. Virtual pages are considered active if they belong to processes which are
running or have run in the last 20 seconds.
avm active virtual pages
fre size of the free list
Pages are reported in units of 1024 bytes.
If the number of pages exceeds 9999, it is shown in a scaled representation. The suffix k indicates multiplication by 1000 and the suffix
m indicates multiplication by 1000000. For example, the value 12345 appears as 12k.
page: information about page faults and paging activity. These are averaged every five seconds, and given in units per second. The size
of a unit is always 1024 bytes and is independent of the actual page size on a machine.
re page reclaims (simulating reference bits)
at pages attached (found in free list not swapdev or filesystem)
pi pages paged in
po pages paged out
fr pages freed per second
de anticipated short term memory shortfall
sr pages scanned by clock algorithm, per-second
disk: s0, s1 ...sn: Paging/swapping disk sector transfers per second (this field is system dependent). Typically paging is split across
several of the available drives. This will print for each paging/swapping device configured into the kernel.
Options-f Provides reports on the number of forks and vforks since system startup and the number of pages of virtual memory involved in each
kind of fork.
-K Displays usage statistics of the kernel memory allocator.
-k Allows a dump to be interrogated to print the contents of the sum structure when specified with a namelist and corefile. This is
the default.
-S Replaces the page reclaim (re) and pages attached (at) fields with processes swapped in (si) and processes swapped out (so).
-s Prints the contents of the sum structure, giving the total number of several kinds of paging related events that have occurred since
boot.
-v Prints an expanded form of the virtual memory statistics.
-z Zeroes out the sum structure if the UID indicates root privilege.
Examples
The following command prints what the system is doing every five seconds:
vmstat 5
To find the status after a core dump use the following:
cd /usr/adm/crash
vmstat -k vmunix.? vmcore.?
Files
Kernel memory
System namelist
vmstat(1)