Embedded profiling as Java Agent

If you need to profile some code as soon as the JVM starts up, instead of using the profiler.sh script, it is possible to attach async-profiler as an agent on the command line. For example:

$ java -agentpath:/path/to/libasyncProfiler.so=start,event=cpu,file=profile.html ...

Agent library is configured through the JVMTI argument interface. The format of the arguments string is described in the source code. The profiler.sh script actually converts command line arguments to that format.

For instance, -e wall is converted to event=wall, -f profile.html is converted to file=profile.html, and so on. However, some arguments are processed directly by profiler.sh script. E.g. -d 5 results in 3 actions: attaching profiler agent with start command, sleeping for 5 seconds, and then attaching the agent again with stop command.