Start Configuration
There are some properties to configure the start procedure of the agent. These properties can only be defined via Java system properties or OS environment variables. If you specify both system property and OS environment variable, the system property will take precedence.
Delaying agent start
Despite instrumenting asynchronously or synchronously, inspectIT always starts the instrumentation process as soon as
the agent is attached to a JVM. There are cases in which it is desirable to postpone the start of the instrumentation
process. Although this is rarely necessary, inspectIT provides the possibility to do so via system property
inspectit.start.delay or OS environment variable INSPECTIT_START_DELAY.
You provide a value interpreted as milliseconds the agent shall wait before the instrumentation process starts. If you do not provide a value the instrumentation process will start immediately.
The Agent expects positive integers excluding zero. For all other values the agent will print an error message on stderr and continue as if there was no value supplied.
Example using system property:
# this will delay the instrumentation process by 10 minutes
$ java -javaagent:"/path/to/inspectit-ocelot-agent-2.6.10.jar" \
-Dinspectit.start.delay=600000 \
-jar my-java-program.jar
Example using OS environment variable (using bash):
# this will delay the instrumentation process by 5 minutes
$ export INSPECTIT_START_DELAY=300000
$ java -javaagent:"/path/to/inspectit-ocelot-agent-2.6.10.jar" -jar my-java-program.jar
Changing temporary directory
By default, the agent will use java.io.tmpdir (Java default) to create temporary files, such as logs or
JAR files. To change the path of the temporary directory, use the system property inspectit.temp-dir
or the OS environment variable INSPECTIT_TEMP_DIR.
-Dinspectit.temp-dir=/user/dir
Recycling JAR files
The agent requires multiple JAR files to allow runtime instrumentation.
By default, these files will be created temporarily at runtime.
Each agent will create these new JAR files for itself inside the temporary directory.
When you are running multiple agents on the same machine, this would consume additional storage space.
Thus, you can configure the agent to recycle such JAR files via the system property inspectit.recycle-jars
or the OS environment variable INSPECTIT_RECYCLE_JARS.
-Dinspectit.recycle-jars=true
The agent will look inside ${temporary-directory}/inspectit-ocelot/2.6.10 for JAR files.
If no files have been found, the agent will create new ones, which can also be used by other agents.
These files will not be deleted after the shutdown of the agent. Thus, when you are updating your agent version,
you will have to delete the JAR files from the previous version manually.