Hello all,
I just stuck up in an uncertain situation related to network performance...
I am trying to access one of my remote client unix machine from a distant location..
The client machine is Ultra-5_10 , with SunOS 5.5.1
The ndd result ( hme1 )shows that the machine is hooked to a... (5 Replies)
We have a AIX v5.3 on a p5 system with a poor performing Ingres database.
We added one CPU to the system to see if this would help. Now there are two CPU's.
with sar and topas -P I see good results: CPU usage around 30%
with topas I only see good results in the process output screen, the... (1 Reply)
Hi,
on a linux server I have the following :
vmstat 2 10
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 4 0 675236 39836 206060 1617660 3 3 3 6 8 7 1 1 ... (1 Reply)
In my C program i am using very large file(approx 400MB) to read parts of it frequently. But due to large file the performance of the program goes down very badly. It shows very high I/O usage and I/O wait time.
My question is, What are the ways to optimize or tune I/O on linux or how i can get... (10 Replies)
Hi Gurus,
I am beginner in solaris and want to know what are the things we need to check for performance monitoring on our solairs OS.
for DISK,CPU and MEMORY.
Also how we do ipforwarding in slaris
Many thanks for your help
Pradeep P (4 Replies)
Hi All,
I have the following script which I use in Nagios to check the health of the applications, the problem with it is that the curl part ($TOTAL) does not return anything after running for 2-3 hrs, even though from command line the script runs fine but not from Nagios.
There are 17... (1 Reply)
hi I am having a performance issue with the following requirement
i have to create a permutation and combination on a set of three files
such that each record in each file is picked and the output is redirected in
a specific format but it is taking around 70 odd hours to prepare a
combination... (7 Replies)
Hi
We have an AIX5.3 server with application which is written in C. We are facing server (lpar) hangs intermediately. If we open new telnet window prompts for user and takes hell of a time to authenticate, not only that if we run ps -aef then also it takes lot of time. surprisingly there is no... (2 Replies)
IN solaris, for network high-availability we are using IPMP concept, can u tell me in REDHAT LINUX what we are using... also pls share good step to read & understand the that concept...
Also performance issue in linux what are step & cmd can u tell me??? (2 Replies)
Discussion started by: tiger09
2 Replies
LEARN ABOUT NETBSD
vmstat
VMSTAT(1) BSD General Commands Manual VMSTAT(1)NAME
vmstat -- report virtual memory statistics
SYNOPSIS
vmstat [-CefHiLlmstUvW] [-c count] [-h hashname] [-M core] [-N system] [-u histname] [-w wait] [disks]
DESCRIPTION
vmstat reports certain kernel statistics kept about process, virtual memory, disk, trap, and CPU activity.
The options are as follows:
-C Report on kernel memory caches. Combine with the -m option to see information about memory pools that back the caches.
-c count Repeat the display count times. The first display is for the time since a reboot and each subsequent report is for the time
period since the last display. If no wait interval is specified, the default is 1 second.
-e Report the values of system event counters.
-f Report fork statistics.
-H Report all hash table statistics.
-h hashname Report hash table statistics for hashname.
-i Report the values of system interrupt counters.
-L List all the hashes supported for -h and -H.
-l List the UVM histories being maintained by the kernel.
-M core Extract values associated with the name list from the specified core instead of the default /dev/mem.
-m Report on the usage of kernel dynamic memory listed first by size of allocation and then by type of usage, followed by a list of
the kernel memory pools and their usage.
-N system Extract the name list from the specified system instead of the default /netbsd.
-s Display the contents of the uvmexp structure. This contains various paging event and memory status counters.
-t Display the contents of the vmtotal structure. This includes information about processes and virtual memory.
The process part shows the number of processes in the following states:
ru on the run queue
dw in disk I/O wait
pw waiting for paging
sl sleeping
The virtual memory section shows:
total-v Total virtual memory
active-v Active virtual memory in use
active-r Active real memory in use
vm-sh Shared virtual memory
avm-sh Active shared virtual memory
rm-sh Shared real memory
arm-sh Active shared real memory
free Free memory
All memory values are shown in number of pages.
-U Dump all UVM histories.
-u histname Dump the specified UVM history.
-v Print more verbose information. When used with the -i, -e, or -m options prints out all counters, not just those with non-zero
values.
-W Print more verbose information about kernel memory pools.
-w wait Pause wait seconds between each display. If no repeat count is specified, the default is infinity.
By default, vmstat displays the following information:
procs Information about the numbers of processes in various states.
r in run queue
b blocked for resources (i/o, paging, etc.)
memory Information about the usage of virtual and real memory. Virtual pages (reported in units of 1024 bytes) 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
page Information about page faults and paging activity. These are averaged every five seconds, and given in units per second.
flt total page faults
re page reclaims (simulating reference bits)
pi pages paged in
po pages paged out
fr pages freed per second
sr pages scanned by clock algorithm, per-second
disks Disk transfers per second. Typically paging will be split across the available drives. The header of the field is the first charac-
ter of the disk name and the unit number. If more than four disk drives are configured in the system, vmstat displays only the first
four drives. To force vmstat to display specific drives, their names may be supplied on the command line.
faults Trap/interrupt rate averages per second over last 5 seconds.
in device interrupts per interval (including clock interrupts)
sy system calls per interval
cs CPU context switch rate (switches/interval)
cpu Breakdown of percentage usage of CPU time.
us user time for normal and low priority processes
sy system time
id CPU idle
FILES
/netbsd default kernel namelist
/dev/mem default memory file
EXAMPLES
The command ``vmstat -w 5'' will print what the system is doing every five seconds; this is a good choice of printing interval since this is
how often some of the statistics are sampled in the system. Others vary every second and running the output for a while will make it appar-
ent which are recomputed every second.
SEE ALSO fstat(1), netstat(1), nfsstat(1), ps(1), systat(1), iostat(8), pstat(8)
The sections starting with ``Interpreting system activity'' in Installing and Operating 4.3BSD.
BUGS
The -c and -w options are only available with the default output.
The -l, -U, and -u options are useful only if the system was compiled with support for UVM history.
BSD October 22, 2009 BSD