On user complains about the performance of web application, as a part application support, we use following commands to see the CPU utilization in the UNIX using ‘sar’ command. Some times it goes below 20 and even reaches 0.

HLW$~> sar -u 10 60

SunOS HLW 5.8 Generic_117350-14 sun4u 05/18/06

13:48:51 %usr %sys %wio %idle
13:49:01 80 5 0 16
13:49:11 72 6 0 22
13:49:21 84 5 0 11
13:49:31 78 4 0 18
13:49:41 71 5 0 24
13:49:51 71 5 0 23
13:50:01 82 6 0 11
13:50:11 84 8 0 8
13:50:21 90 10 0 0
13:50:31 92 7 0 1
13:50:41 86 4 0 11
13:50:51 94 6 0 0
13:51:01 82 3 0 15

Is there anyway to find which process or thread blocking the CPU and RAM? Could we identify which process is blocking this and why it is blocking (I mean which activity is blocking)?

You can use prstat on Solaris 8 and above - works like top. Should show the processes taking up the cpu/memory - see prstat man page for more info.

Thanks for your reply.

When I use prstat -s size -n 5 to find this the process id 15643 (one of the weblogic node) utlizes 65%. But I was able to find out which activity or thread utilizing this. Can we still drill down to find out this? Please see the result.

HLW$~> prstat -s size -n 5
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
15642 weblogic 1919M 1066M run 6 12 0:08.11 20% java/60
15643 weblogic 1748M 892M cpu0 0 12 1:48.01 65% java/60
15636 weblogic 238M 151M sleep 17 12 0:00.15 0.0% java/69
15621 weblogic 165M 44M sleep 12 12 0:00.02 0.0% java/14
15266 clarify 105M 31M sleep 54 0 0:41.40 0.6% rmworkerprocess/6
Total: 63 processes, 402 lwps, load averages: 2.92, 2.88, 2.81


HLW$~> ps -fu weblogic
UID PID PPID C STIME TTY TIME CMD
weblogic 15606 1 0 06:03:09 ? 0:00 /bin/sh ../Harlow_O2_Training/startNodeManager.sh
weblogic 15642 15621 5 06:04:28 ? 95:52 /usr/local/weblogic/jdk142_04/bin/java -client -Xms1024m -Xmx1024m -Xmn400m -XX
weblogic 21686 21681 0 13:49:59 pts/1 0:00 bash
weblogic 22657 21686 0 14:05:35 pts/1 0:00 tail -f Harlow_O2_Training.log
weblogic 15621 15606 0 06:03:09 ? 0:05 /usr/local/weblogic/jdk142_04/bin/java -client -Xms32m -Xmx200m -Xverify:none -
weblogic 15643 15621 12 06:04:28 ? 179:47 /usr/local/weblogic/jdk142_04/bin/java -client -Xms1024m -Xmx1024m -Xmn400m -XX
weblogic 21681 21674 0 13:49:58 pts/1 0:00 -ksh
weblogic 15622 1 0 06:03:15 ? 0:00 /bin/sh ../Harlow_O2_Training/startWebLogic.sh
weblogic 15636 15622 0 06:03:15 ? 1:33 /usr/local/weblogic/jdk142_04/bin/java -server -Xms32m -Xmx200m -XX:MaxPermSize
weblogic 3746 1 0 Apr 18 ? 0:00 tail -f weblogic_18042006.log

Thanks