traceprof

package
v1.0.2 Latest Latest
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Published: May 10, 2023 License: Apache-2.0, BSD-3-Clause, Apache-2.0 Imports: 2 Imported by: 0

Documentation

Overview

Package traceprof contains shared logic for cross-cutting tracer/profiler features.

Index

Constants

View Source
const (
	SpanID          = "span id"
	LocalRootSpanID = "local root span id"
	TraceEndpoint   = "trace endpoint"
)

pprof labels applied by the tracer to show up in the profiler's profiles.

View Source
const (
	CodeHotspotsEnvVar  = "DD_PROFILING_CODE_HOTSPOTS_COLLECTION_ENABLED" // aka code hotspots
	EndpointEnvVar      = "DD_PROFILING_ENDPOINT_COLLECTION_ENABLED"      // aka endpoint profiling
	EndpointCountEnvVar = "DD_PROFILING_ENDPOINT_COUNT_ENABLED"           // aka unit of work
)

env variables used to control cross-cutting tracer/profiling features.

Variables

This section is empty.

Functions

This section is empty.

Types

type EndpointCounter

type EndpointCounter struct {
	// contains filtered or unexported fields
}

EndpointCounter counts hits per endpoint.

TODO: This is a naive implementation with poor performance, e.g. 125ns/op in BenchmarkEndpointCounter on M1. We can do 10-20x better with something more complicated [1]. This will be done in a follow-up PR. [1] https://github.com/felixge/countermap/blob/main/xsync_map_counter_map.go

func GlobalEndpointCounter

func GlobalEndpointCounter() *EndpointCounter

GlobalEndpointCounter returns the endpoint counter that is shared between tracing and profiling to support the unit of work feature.

func NewEndpointCounter

func NewEndpointCounter(limit int) *EndpointCounter

NewEndpointCounter returns a new NewEndpointCounter that will track hit counts for up to limit endpoints. A limit of <= 0 indicates no limit.

func (*EndpointCounter) GetAndReset

func (e *EndpointCounter) GetAndReset() map[string]uint64

GetAndReset returns the hit counts for all endpoints and resets their counts back to 0.

func (*EndpointCounter) Inc

func (e *EndpointCounter) Inc(endpoint string)

Inc increments the hit counter for the given endpoint by 1. If endpoint counting is disabled, this method does nothing and is almost zero-cost.

func (*EndpointCounter) SetEnabled

func (e *EndpointCounter) SetEnabled(enabled bool) bool

SetEnabled changes if endpoint counting is enabled or not. The previous value is returned.

Directories

Path Synopsis
Package testapp has the protbuf/grpc definitions for the test application implemented in traceproftest.
Package testapp has the protbuf/grpc definitions for the test application implemented in traceproftest.
Package traceproftest contains test cases and test helpers for testing cross-cutting tracer/profiler features such as code hotspots and endpoints.
Package traceproftest contains test cases and test helpers for testing cross-cutting tracer/profiler features such as code hotspots and endpoints.

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