Hi all,

I have a requirement for a script to find out the increase in memory. We have a log native_stderr.log where this will log.

bash-2.05$ tail -40 native_stderr.log | grep ': freed'
<GC(4140): freed 168190456 bytes, 66% free (180990488/271776256), in 253 ms>
<GC(4141): freed 167436384 bytes, 66% free (180290224/271776256), in 414 ms>
<GC(4142): freed 168588096 bytes, 66% free (181440728/271776256), in 352 ms>

Here i have put some more filter and able to get the values.

tail -40 native_stderr.log | grep ': freed' | awk -F '(' '{print $3}' | awk -F '/|)' '{print $1, $2}'
178893640 271776256
178153688 271776256
178595056 271776256

but i need to find out the differnce between the last line $1 value and the second last line value $1

like 178595056 - 178153688 = 441368 bytes
then change to MB 441368/(1024*1024) = 0.42

if this value is more than 50 MB then i need to send mail. Could you please some one help on this.

Thanks
Senthilkumar AK


-----Post Update-----

i have found some way but still your expert views needed on this

tail -40 native_stderr.log | grep ': freed' | awk -F '(' '{print $3}' | awk -F '/|)' '{a=($2-$1)/(1024*1024);y=x "\n" a; x=a};END{printf "%-15s%3.2f%-2s\n", "Difference is", x-y, " MB"}'

Thanks
Senthyilkumar