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heaptrack

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Use when tracking heap allocations on Linux with heaptrack: allocation hotspots, peak heap, temporary allocations, leaks, or a diff of two runs via heaptrack_print. Not for heap errors: use valgrind.

.devin/skills/heaptrack/SKILL.md

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# heaptrack

heaptrack (1.5.0 on the grounding host) intercepts `malloc`, `free`, `realloc`, and the C++ allocation operators through `LD_PRELOAD` or injection, records a backtrace per allocation, and compresses the trace to one file. `heaptrack_print` reads that file into four rankings: most calls, peak consumption, most temporary allocations, and leaks. It needs no rebuild and runs far faster than Valgrind's Massif.

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A program uses too much memory, allocates too often, or leaks, and the user wants the allocating call stacks; or two builds must be compared for allocation behavior. |
| Authority | Reversible local: writes only heaptrack data files (`heaptrack.<prog>.<pid>.zst` or the `-o` target), `heaptrack_print` output files, and the test binary in the working directory; rollback is deleting them. No remote mutation. |
| Side effect | Data files on disk. The traced program runs slower while every allocation is unwound and logged. |
| Done | The report names the top call stacks by peak bytes, by call count, and by temporary allocations, lists the leak records with their stacks, and, for a comparison, the per-stack delta between the two runs. |

## Inputs