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.NET Support

In order for the Polar Signals Agent to be able to profile .NET code, the DOTNET_PerfMapEnabled=3 and DOTNET_EnableWriteXorExecute=0 environment variables need to be set.

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 the .NET process is started with the DOTNET_PerfMapEnabled=3 and DOTNET_EnableWriteXorExecute=0 environment variables set.

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 dotnet-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.