I have a server that has 32G of physical memory and 10G of swap space.
Routinely during the day, always around the same time, it will gradually
go to ~80% swap space usage.
Using Hotsanic, I can see that this percentage of swap space usage has
been gradually increasing over the months. About a year ago, it was at
~50% so now I'm becoming alarmed.
The simple solution (which I will be doing in any case) is to add more
swap space. This does fix the memory issue but I fear there are some
performance implications that I have yet to hear about from my users.
So, I wrote a program that I thought would gather the amount of memory
used by my key applications (being Oracle and Java) and display it for me.
The idea was flawed because of shared memory. I have yet to devise a way
around this issue and that is where I could use some help.
Here is the program for informational purposes:
TOTAL=0
if [ $1 = "" ]
then
echo "You must enter the program you wish to find out the memory usage
for."
fi
ps -ef|grep $1|grep -v grep|tr -s " "|cut -d " " -f2 >
/tmp/will_memory_usage.txt
exec 3< /tmp/will_memory_usage.txt
until [ $done ]
do
read <&3 line
if [ $? != 0 ]; then
done=1
continue
fi
PROCVERT=`cat /proc/$line/status|grep VmSize|tr -s " "|cut -d " " -f2`
let TOTALVERT=TOTALVERT+PROCVERT
PROCREAL=`cat /proc/$line/status|grep VmRSS|tr -s " "|cut -d " " -f2`
let TOTALREAL=TOTALREAL+PROCREAL
done
echo "$1 virtual memory usage is $TOTALVERT."
echo "$1 real memory usage is $TOTALREAL."
let TOTAL=TOTALREAL+TOTALVERT
echo " "
echo "Total $1 memory usage is $TOTAL."
rm /tmp/will_memory_usage.txt
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