# lucko/spark

A performance profiler for Minecraft clients, servers, and proxies.

Repository: https://github.com/lucko/spark
Canonical: https://ross.abutalabs.com/products/lucko-spark
Homepage: https://spark.lucko.me/
Language: Java
License: GPL-3.0
License Family: copyleft
Topics: minecraft, performance, profiler, spigot, fabric, forge, fabricmc, minecraft-server, bukkit
Last push: 2026-08-25T17:43:33+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 3021, "days_push": 8, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1323, forks 195 (observed 2026-08-28T04:04:22.234257+00:00)

## What it is
spark is a performance profiler for Minecraft clients, servers, and proxies, combining a lightweight CPU profiler, memory inspection tools (heap summaries, heap dumps, GC monitoring), and server health reporting. Results are uploaded to an online viewer for analysis, and it installs as a plugin or mod on platforms like Bukkit/Spigot/Paper, Fabric, Forge, BungeeCord, and Velocity.

## Use cases
- diagnose lag and low TPS on my Minecraft server
- profile CPU usage to find performance bottlenecks
- take a heap dump to investigate memory leaks
- monitor garbage collection activity on a Minecraft server
- track server health metrics like TPS and MSPT over time
- profile memory allocations causing server hangs
- find which plugin or mod is causing tick lag

## When to choose
- you run a Minecraft server, client, or proxy and need production-safe profiling with minimal impact
- you want quick, no-setup diagnostics of lag, CPU, or memory issues
- you need readable call graphs and shareable online profile results

## When to avoid
- you need deep JVM profiling beyond Minecraft workloads - use async-profiler or a full APM tool directly
- you need a general-purpose application performance monitoring solution for non-Minecraft Java services
- you require profiling on platforms unsupported by the native async engine (though the Java engine still works)

## Facets
- artifact type: application
- maturity: active
- function: monitoring, benchmarking
- domain: gaming-tools, performance, monitoring, developer-tools
- platform: jvm, windows, cross-platform
- tags: cpu-profiler, heap-dump, gc-monitoring, tps, spigot, paper, fabric, forge, bukkit, async-profiler, online-viewer, minecraft, linux, macos

## Member repositories
- lucko/spark (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:22.234257+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:47:05.460375+00:00, confidence not recorded.
  - readme: https://github.com/lucko/spark (fetched 2026-08-28T04:04:22.234257+00:00, sha 959660828b8b)
  - homepage: https://spark.lucko.me/ (fetched 2026-08-29T12:05:55.883263+00:00, sha 2214fe398927)
  - site_page: https://spark.lucko.me/docs (fetched 2026-08-29T12:05:55.885914+00:00, sha 8b38a410ade7)
  - site_page: https://spark.lucko.me/docs/Command-Usage (fetched 2026-08-29T12:05:55.887895+00:00, sha 88848bee5cbe)
  - site_page: https://spark.lucko.me/docs/misc/Credits (fetched 2026-08-29T12:05:55.889992+00:00, sha 91fc37d948ca)
- Data as of 2026-08-30T08:39:29.467469+00:00.