Patterns

Mar 29

Mapping Java Thread ID to the hex id of a stacktrace

So you generated a stacktrace and also identified the thread which is causing you so much pain but don’t know how to map one to the other? Do it like this:

Find the PID of the java process:
host:/service/activemq/log/main# ps -ef|grep activemq activemq 24380 20411 0 Mar25 ? 00:02:56 /usr/bin/java -Xmx512M -Dorg.apache.activemq.UseDedicatedTaskRunner=true -Dcom.sun.management.jmxremote -Dactivemq.classpath=/usr/local/activemq/conf; -Dactivemq.home=/usr/local/activemq -Dactivemq.base=/usr/local/activemq -jar /usr/local/activemq/bin/run.jar start
Sort the java threads by consumed CPU time:
host:/service/activemq/log/main# ps -T -p 24380 -o pid,tid,pri,time | grep -v '00:00:00' PID TID PRI TIME 24380 24380 15 00:00:05 24380 24389 24 00:02:37 24380 24407 24 00:00:01

Convert the Thread ID to hex format:
host:/service/activemq/log/main# printf "%X\n" 24389 5F45

Search for the Thread ID (in hex format) in your log:
host:/service/activemq/log/main# grep 5f45 current @4000000049ceb85c022cfbe4 "VM Thread" prio=1 tid=0x0809b778 nid=0x5f45 runnable

Dec 19

JavaScript Library: extjs 2.0

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http://extjs.com/

For a few simple tasks like an accordion menu and a grid I started testing the ExtJS JavaScript library and I have to say, once you get the hang of it, it’s pretty straight forward and helps to achieve results in no time. A few interesting code snippets for the accordion menu can be found here.

May 08