Open-source alternatives to Tracer

Node-clinic is a performance profiling suite for Node.js designed to diagnose CPU bottlenecks, memory leaks, and asynchronous event loop issues. It provides specialized diagnostic tools for visualizing asynchronous flows, generating CPU flame graphs, and analyzing heap memory allocation. The suite includes a CPU flame graph tool to identify functions consuming the most processing time, a heap memory analyzer to track object allocation and leaks, and an asynchronous I/O profiler to map operation flows and find event loop bottlenecks. These tools cover broader capabilities in CPU execution pro

F# -> ASM disassembler

🔥 single-command flamegraph profiling 🔥

Analyze computation-communication overlap in V3/R1.

jHiccup is a non-intrusive instrumentation tool that logs and records platform "hiccups" - including the JVM stalls that often happen when Java applications are executed and/or any OS or hardware platform noise that may cause the running application to not be continuously runnable.

中文版

v8-profiler-next provides node bindings for the v8 profiler.

A sampling JVM profiler without the safepoint sample bias

1. Install and configure elasticsearch - https://www.elastic.co/downloads/elasticsearch 2. Install and configure Kibana - https://www.elastic.co/downloads/kibana 3. Install and configure elastic APM server - https://www.elastic.co/downloads/apm

Utilities for latency measurement and reporting

1. Create an account at 2. From the UI, create an app. You'll get an AppId and an AppSecret. 3. Run meteor add meteorhacks:kadira in your project 4. Configure your Meteor app with the AppId and AppSecret by adding the following code snippet to a server/kadira.js file:

Blazing fast flame graph tool for V8 and Node 🔥

node-memwatch: Leak Detection and Heap Diffing for Node.JS

This package is based on meteorhacks/kadira.

New Relic RPM Ruby Agent

v8-profiler provides node bindings for the v8 profiler and integration with node-inspector

CPU & Memory Monitor, auto dump.

MCP server that channels JVM forensics into structured leak verdicts — for Claude Code.

JVM runtime execution analysis - finds hot code paths by frequency, not CPU time

thetool is a CLI tool to capture different cpu, memory and other profiles for your node app in Chrome DevTools friendly format

Skylight agent for Ruby

Cross-platform process cpu % and memory usage of a PID.

Generates flamegraphs with Node.js or in the browser.

Log analyser / visualiser for Java HotSpot JIT compiler. Inspect inlining decisions, hot methods, bytecode, and assembly. View results in the JavaFX user interface.