Java settings for Call Graph Profiling

Learn about the available Java agent settings for Call Graph Profiling in Splunk APM.

The following settings control the Call Graph Profiling feature for the Java agent.


Environment variable	Description	Default value
`splunk.snapshot.profiler.enabled`	Enables the snapshot profiler required for call graph generation.	`false`
`splunk.snapshot.profiler.sampling.interval`	Sampling interval (e.g., 10ms). Lower values increase stack capture frequency.	`10ms`
`splunk.snapshot.selection.probability`	Probability of selecting a trace for snapshot profiling. Maximum value is `0.10`.	`0.01`
`splunk.snapshot.profiler.max.stack.depth`	Maximum depth of captured call stacks.	`1024`
`splunk.snapshot.profiler.export.interval`	Interval for exporting collected stack data.	`5s`
`splunk.snapshot.profiler.staging.capacity`	Capacity of the staging buffer before export.	`2000`

Note: These settings can be passed as JVM system properties or as environment variables depending on your deployment model.

For the complete list of settings for the Java agent, see Configure the Java agent for Splunk Observability Cloud.

Recommended settings to improve visibility

Use the following configuration adjustments to reduce the likelihood of missing stack data:


Environment variable	Recommendation
`splunk.snapshot.profiler.sampling.interval`	Lower to `1` ms to maximize sampling frequency.
`splunk.snapshot.selection.probability`	Raise to `0.05` or `0.1` to include more traces.

Note: These adjustments may increase resource usage. Test changes in staging environments before applying to production.