explaingit

cdoky/fbmemoryprofiler

Analysis updated 2026-07-18 · repo last pushed 2016-04-15

Objective-CAudience · developerComplexity · 3/5DormantSetup · moderate

TLDR

An in-app iOS debugging tool from Facebook that shows a live view of memory usage, tracks object creation over time, and flags retain cycles wasting memory.

Mindmap

mindmap
  root((repo))
    What it does
      Shows memory usage
      Tracks generations
      Finds retain cycles
    Tech stack
      Objective-C
      FBAllocationTracker
      FBRetainCycleDetector
    Use cases
      Debug memory bloat
      Find leaking objects
      Extend with plugins
    Audience
      iOS developers
      Facebook engineers

Code map

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filefunction / class

What do people build with it?

USE CASE 1

Enable an in-app button to inspect all objects currently held in memory while testing a feature.

USE CASE 2

Track memory usage across app 'generations' to see what changed between two points in time.

USE CASE 3

Detect retain cycles that are silently wasting memory or causing slowdowns.

USE CASE 4

Write a custom plugin to log memory data to a server or auto-clean specific caches.

What is it built with?

Objective-CiOS

How does it compare?

cdoky/fbmemoryprofileradispring/mapios8cdoky/yytext
LanguageObjective-CObjective-CObjective-C
Last pushed2016-04-152014-12-112021-11-30
MaintenanceDormantDormantDormant
Setup difficultymoderateeasymoderate
Complexity3/52/53/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 30min

Designed for Debug builds only, README doesn't fully document the visual interface.

Copy-paste prompts

Prompt 1
Show me how to add FBMemoryProfiler to a Debug build of my iOS app.
Prompt 2
Explain how FBMemoryProfiler's generations feature lets me compare memory snapshots over time.
Prompt 3
How does FBMemoryProfiler use FBRetainCycleDetector to find memory leaks in my app?
Prompt 4
Walk me through writing a custom plugin for FBMemoryProfiler to log memory data to a server.

Frequently asked questions

What is fbmemoryprofiler?

An in-app iOS debugging tool from Facebook that shows a live view of memory usage, tracks object creation over time, and flags retain cycles wasting memory.

What language is fbmemoryprofiler written in?

Mainly Objective-C. The stack also includes Objective-C, iOS.

Is fbmemoryprofiler actively maintained?

Dormant — no commits in 2+ years (last push 2016-04-15).

How hard is fbmemoryprofiler to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is fbmemoryprofiler for?

Mainly developer.

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