Set default sampling interval in millis in config

Author: szegedi

packages/dd-trace/src/profiling/config.js

@@ -171,6 +171,8 @@ class Config {
       samplingContextsAvailable))
     checkOptionWithSamplingContextAllowed(this.cpuProfilingEnabled, 'CPU profiling')
 
+    this.samplingInterval = coalesce(options.samplingInterval, 1e3 / 99) // 99hz in millis
+
     this.heapSamplingInterval = coalesce(options.heapSamplingInterval,
       Number(DD_PROFILING_HEAP_SAMPLING_INTERVAL))
     const uploadCompression0 = coalesce(options.uploadCompression, DD_PROFILING_DEBUG_UPLOAD_COMPRESSION, 'on')

packages/dd-trace/src/profiling/profilers/wall.js

@@ -71,7 +71,7 @@ function ensureChannelsActivated () {
 class NativeWallProfiler {
   constructor (options = {}) {
     this.type = 'wall'
-    this._samplingIntervalMicros = options.samplingInterval || 1e6 / 99 // 99hz
+    this._samplingIntervalMicros = (options.samplingInterval || 1e3 / 99) * 1000 // 99hz
     this._flushIntervalMillis = options.flushInterval || 60 * 1e3 // 60 seconds
     this._codeHotspotsEnabled = !!options.codeHotspotsEnabled
     this._endpointCollectionEnabled = !!options.endpointCollectionEnabled

packages/dd-trace/test/profiling/profilers/wall.spec.js

@@ -66,7 +66,7 @@ describe('profilers/native/wall', () => {
   })
 
   it('should use the provided configuration options', () => {
-    const samplingInterval = 500
+    const samplingInterval = .5
     const profiler = new NativeWallProfiler({ samplingInterval })
 
     profiler.start()