inspectIT

Interesting Open Source APM: https://github.com/inspectIT

To run it on Mac is necessary:

WLS:

startWebLogic.sh

-javaagent:/Applications/inspectIT/agent/inspectit-agent.jar -Dinspectit.repository=localhost:9070 -Dinspectit.agent.name=test1

inspectIT Server: (nothing, just run it)

/Applications/inspectIT/CMR/startup.sh

InspectIT Client:
(eclipse)

/Applications/inspectIT/inspectit/run.sh
(some modifications are necessary)

$ cat /Applications/inspectIT/inspectit/run.sh
xattr -r -d com.apple.quarantine inspectIT.app
./inspectIT.app/Contents/MacOS/inspectIT -vm /Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/bin -data /Users/German/tmp/workspace-inspectit -debug

Issue:

I hit a bug when using a JDK newer than 1.8.0_131 (on Mac)

https://inspectit-performance.atlassian.net/browse/INSPECTIT-2560?focusedCommentId=33865&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-33865



TODO:

- https://blog.novatec-gmbh.de/can-opentracing-scene-benefit-new-tracer-implementations/

Rightmost duplicated Xmx

Just like it's explained at Stackoverflow question, most JVM take rightmost duplicated java properties values, in particular memory settings:

java -server -Xms256m -Xmx512m -XX:MaxPermSize=256m -Dweblogic.Name=servidor01 -Djava.security.policy=/u04/Middleware/P_WLS12c/product/wlserver/server/lib/weblogic.policy -Dweblogic.ProductionModeEnabled=true -Dweblogic.system.BootIdentityFile=/u04/Admin/domains/dominio/servers/servidor01/data/nodemanager/boot.properties -Dweblogic.nodemanager.ServiceEnabled=true -Dweblogic.nmservice.RotationEnabled=true -Dweblogic.security.SSL.ignoreHostnameVerification=false -Dweblogic.ReverseDNSAllowed=false -Djava.awt.headless=true -Xms2g -Xmx2g -XX:MaxPermSize=2g -Djava.security.egd=file:/dev/./urandom -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintHeapAtGC 

public class TotalMemory
{
 public static void main(String[] args)
 {
 System.out.println("Total Memory: "+Runtime.getRuntime().totalMemory());
 System.out.println("Free Memory: "+Runtime.getRuntime().freeMemory());
 }
}

> java -version; java -Xmx1G -XX:+PrintFlagsFinal -Xmx2G 2>/dev/null | grep MaxHeapSize

The way is parsed: 

for( int i=0; i<argc; i++ ) {
  process_argument(argv[i]);
}

(2G of Heap !)