Profile Heap Allocations Using Valgrind Massif

See Allocation Churn

Valgrind Massif records heap snapshots over time so you can see peak usage and which call stacks allocated it. Chrome's allocator telemetry and Rust's dhat serve the same goal: find leaks, spikes, and unexpected strdup hot paths.

Massif Workflow

Run with --tool=massif, open massif.out in ms_print or massif-visualizer. Look for stairs that never descend (leak) and sudden peaks (batch allocation).

bash
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Compile with -g for symbolic stacks
--pages-as-heap=yes includes mmap allocations
Peak matters for mobile and embedded caps
Pair with Callgrind to see if hot functions also allocate

Working Through the Exercise

Keep the relevant documentation open while you implement. When your output disagrees with the reference, trace one failing case by hand before changing random lines.

Trace first: walk one failing input step by step
Read the manual: skim the official doc for the mechanism named in this task
Compare baselines: save measurements from the prior step so speedups are honest

Why for this exercise

You will run Massif on a program with deliberate allocation patterns and identify the top allocator stack. This exercise requires reporting peak bytes and the responsible function.

Demonstrate heap profiling with Valgrind Massif.

Requirements:

Create program with various allocation patterns
Include intentional memory leaks for demonstration
Include high-watermark allocations (freed later)
Use malloc/free and show allocation lifetimes
Print allocation and deallocation events
Show different memory leak scenarios
Include temporary allocations (freed quickly)
Include long-lived allocations
Provide instructions for running massif
Analyze massif output and explain findings

See Allocation Churn

Massif Workflow

Run with --tool=massif, open massif.out in ms_print or massif-visualizer. Look for stairs that never descend (leak) and sudden peaks (batch allocation).

bash
Loading…

Compile with -g for symbolic stacks
--pages-as-heap=yes includes mmap allocations
Peak matters for mobile and embedded caps
Pair with Callgrind to see if hot functions also allocate

Working Through the Exercise

Keep the relevant documentation open while you implement. When your output disagrees with the reference, trace one failing case by hand before changing random lines.

Trace first: walk one failing input step by step
Read the manual: skim the official doc for the mechanism named in this task
Compare baselines: save measurements from the prior step so speedups are honest

Why for this exercise

You will run Massif on a program with deliberate allocation patterns and identify the top allocator stack. This exercise requires reporting peak bytes and the responsible function.

Demonstrate heap profiling with Valgrind Massif.

Requirements:

Create program with various allocation patterns
Include intentional memory leaks for demonstration
Include high-watermark allocations (freed later)
Use malloc/free and show allocation lifetimes
Print allocation and deallocation events
Show different memory leak scenarios
Include temporary allocations (freed quickly)
Include long-lived allocations
Provide instructions for running massif
Analyze massif output and explain findings

Topic Overview

See Allocation Churn

Massif Workflow

Working Through the Exercise

Why for this exercise

Implementation Task

Progressive Hints

Resources

Open Source

Profile Heap Allocations Using Valgrind Massif

Topic Overview

See Allocation Churn

Massif Workflow

Working Through the Exercise

Why for this exercise

Implementation Task

Progressive Hints

Resources

Open Source