Java memory profiler

[Joshua Fox]

I suspect a "leak" in my Java application on App Engine Flexible Environment and I'd like to trace memory, as I would do with JProfiler, YourKit, or VisualVM on my local machine. Heroku has some functionality for this. 

I'd like to trace the classes, allocation point, and path to GC root for objects allocated during a certain action, for which I set checkpoints. Or if that is not possible, I'd like a heap dump of the (enormous) memory of my instance.

How can this be done in App Engine Flex Environment?

[Adam (Cloud Platform Support)]

Configuring JVM options during deployment currently isn't possible with the Cloud SDK, but it does sound like a good feature request to make on the issue tracker.

It is possible to rebuild the runtime docker image from source however (see the github project links) and insert your own JVM options into jetty_cmd.sh so this may be one way to enable native memory tracking or JMX on the deployed instance. I've only done minimal testing on this myself though.

[Joshua Fox יהושע פוקס‎]

 OK, I added a ticket.

It would be a great enhancement deep memory and performance profiling for Flexible Environment (and other Google Cloud platforms), perhaps as part of Stackdriver.

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