Add example stress query

[smyrick]

📝 Description

Add a StressQuery that will create a lot of nodes so we can stress test data fetchers with a single query instead of lots of requests.

This will help us debug performance overhead around PropertyDataFetcher vs FunctionDataFetcher vs suspend FunctionDataFetcher

Test Results

I used YourKit locally to get a snapshot of each query. The files are too big to upload but I am looking at the results right now

Property

query stress {
  stressNode(count:100000) {
    valueId
  }
}

Functions

query stress {
  stressNode(count:100000) {
    functionId
  }
}

Suspend Functions

query stress {
  stressNode(count:100000) {
    suspendId
  }
}

[smyrick]

I looked at all the snapshots for the time to execute SimpleQueryHandler::executeQuery since this is run for each request and ignores all the started up time and the serialization/server time.

Here are the times in ms

valueId	functionId	suspendId
2681	2781	3400
0%	+4% valueId	+27% valueId, +22% functionId

The difference between a FunctionDataFetcher and PropertyDataFetcher does exist but it is not the major concern. There is significant overhead to run suspending functions when we create a lot of them though from the baseline of a just returning properties.

[smyrick]

Instrumentation

I added two more queries which add the TrackTimesInvokedInstrumentation. This track the total number of times each field that is marked with the directive is invoked for every request. This just simulates some instrumentation that would perform some work and modify a state object per field.

Running a query like this logs the following on the server TrackTimesInvokedInstrumentation fields invoked: {loggingFunctionId=10, suspendLoggingFunctionId=10}

query stress {
  stressNode(count:10) {
    valueId
    loggingFunctionId
    suspendLoggingFunctionId
  }
}

Queries

Function Instrumentation

query stress {
  stressNode(count:100000) {
    suspendLoggingFunctionId
  }
}

Suspend Function Instrumentation

query stress {
  stressNode(count:100000) {
    loggingFunctionId
  }
}

Performance

loggingFunctionId	suspendLoggingFunctionId
3726	3983
0%	+7%