Erlang Support

To enable your Erlang application to be able to be profiled by the Polar Signals Agent, you need Erlang/OTP 24+ and enable the +JPperf map flag, which often can be specified via environment flags as well ERL_FLAGS="+JPperf map".

Troubleshooting

Below are some situations and how to troubleshoot them. If you've tried these and still haven't been able to resolve the issue, please contact support.

All I can see is memory addresses

First make sure Erlang/OTP 24+ is used and that the +JPperf map flag is set either directly or via the ERL_FLAGS="+JPperf map" environment variable.

Then check that the process is successfully writing a perfmap. By default, perfmaps are written to /tmp/perf-<PID>.map.

On Kubernetes for example this can be checked with:

kubectl exec --namespace <namespace-name> <pod-name> -- ls -la /tmp

For example:

$ kubectl exec -n default erlang-demo -- ls -la /tmp
total 144
drwxrwxrwt 1 root root   4096 Jul 12 08:59 .
drwxr-xr-x 1 root root   4096 Jul 12 08:59 ..
-rw-r--r-- 1 root root 131811 Jul 12 08:59 perf-1.map

In this example the file we're looking for is the perf-1.map. For you it should be called something similar.