This is a tool that continuously queries Parca instances for their data.
It is based on the Parca gRPC APIs defined on https://buf.build/parca-dev/parca and uses the generated connect-go code via go.buf.build/bufbuild/connect-go/parca-dev/parca.
go install github.com/parca-dev/parca-load@latest
or run the container images
docker run -d ghcr.io/parca-dev/parca-load
It runs a goroutine per API type.
It starts a Labels goroutine that starts querying all labels on a Parca instance and then writes these into a shared map.
The map is then read by the Values goroutine that selects a random label and queries all values for it.
This process it repeated every 5 seconds (configurable). The entries of the shared map eventually expire to not query too old data.
Similarly, it starts querying ProfileTypes every 10 seconds (configurable) to know what profile types are available.
The result is written to a shared map.
Every 15 seconds (configurable) there are QueryRange requests (querying 15min and 7 day ranges) for all series.
Once the profile series are discovered above there are Query requests querying single profiles every 10 seconds.
For these queries it picks a random timestamp of the available time range and queries a random report type (flame graph, top table, pprof download).
Every 15 seconds (configurable) there are Query requests that actually request merged profiles for either 15min, or 7 days, if enough data is available for each in a series.
Metrics are collected and available on http://localhost:7171/metrics