Monitor Unix Memory RSS And VSS
Keep a good practice in monitor your Unix system memory growth especially on memory RSS and VSS using glance on HP-UX. What if you don’t have the tools glance available for system monitoring?
You can opt to use the command top, however I would love to use the command ‘UNIX95= ps -eo vsz,ruser,pid,args | sort -rn’ in any Unix variant as the output doesn’t change fast on screen.
You can split the monitoring based on process name such as f60webmx (Oracle Forms session), java or LIB (Oracle Concurrent Manager session) by using the query as below.
while true do UNIX95= ps -eo vsz,ruser,pid,args | sort -rn | grep f60webmx | grep applprod | head -20 sleep 5 clear done
while true do UNIX95= ps -eo vsz,ruser,pid,args | sort -rn | grep java | grep applprod | head -20 sleep 5 clear done
while true do UNIX95= ps -eo vsz,ruser,pid,args | sort -rn | grep LIB | grep applprod | head -20 sleep 5 clear done
In every 5 second, the screen will be refresh to display the top 20 process with highest memory consumption.
From the first column of the result, multiply it with 4096 and divide by 1024/1024 to get the result of memory in MB.
Related Posts
- How To Check Top Memory Usage In Unix
- Oracle Java Memory Performance
- Detect Oracle Memory Hunger Process
- Oracle Memory Allocation
- Database Session Memory Usage
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Leave a Comment- #2
Kusanagi
February 4, 2010 8:06 pmRuben,
We had error on the Oracle E-Business Suite login page where the user saw the error as below.
Request URI:/OA_HTML/AppsLocalLogin.jsp
Exception:
java.lang.OutOfMemoryError: Java heap spaceWe found there’s high number of JDBC connection upon checking using your SQL.
We restarted our Apache instance in periodic basis to flush the Java memory heap and set the concurrent memory growth by setting the 2 lines below in environment files:
FDMXHEAP=500000000
export FDMXHEAPThe value of FDMXHEAP was set to 500MB and we still monitor on the issue. Let me know if you have any solution to share. Thanks
- #3
July 13, 2011 10:00 pmJust want to share out the two Unix script as below. Quite useful to detect memory leak and CPU hunger processes.
# Top 20 process with highest memory utilization
while true
do
echo “Top 20 Memory Hunger Process”
echo `date`
UNIX95= ps -ef -o pid,ruser,vsz,args | sort -r -n -k3 | head -20
sleep 5
clear
done# Top 20 process with highest CPU utilization
while true
do
echo “Top 20 CPU Hunger Process”
echo `date`
UNIX95= ps -ef -o pid,ruser,pcpu,args | sort -r -n -k3 | head -20
sleep 5
clear
done
- #4
July 17, 2011 9:05 pmLooking on how to capture prstat in specific timeframe and output it to a file? This is the prstat command which will run every 30 minutes and spool to output file.
prstat -a -c 1800 | nawk ‘$1==”PID” { “date” | getline d ; close(“date”) } { print d,$0 }’ >> prstat.log
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Period.
January 25, 2010 12:36 am
Are you having high memory consumption in java process? Use the script to check on the JDBC connectivity if you are running on Oracle E-Business 11i or R12.
select ‘Number of user sessions : ‘ || count( distinct session_id) How_many_user_sessions
from icx_sessions icx where disabled_flag != ‘Y’
and PSEUDO_FLAG = ‘N’
and (last_connect + decode(FND_PROFILE.VALUE(‘ICX_SESSION_TIMEOUT’), NULL,limit_time, 0,limit_time,FND_PROFILE.VALUE(‘ICX_SESSION_TIMEOUT’)/60)/24) > sysdate and counter < limit_connects;
select count(*), machine, process, module
from v$session
where program like 'JDBC%'
group by machine, process, module order by 1 asc;