memory-contexts
Skill1 starsChanged 6 months agoPostgreSQLView on GitHub
Allocate memory in PostgreSQL backend C — pick the right MemoryContext and use palloc / palloc0 / pstrdup / psprintf correctly. Covers CurrentMemoryContext / TopMemoryContext / per-query / per-tuple / ExecutorState context choice, MemoryContextSwitchTo discipline, the OOM-throws-ereport contract (no NULL checks), pfree vs MemoryContextReset vs MemoryContextDelete, the AllocSet vs Slab vs Generation vs Bump context-type cheat sheet, and leak-scoping in long-running backends. Use whenever a PG patch or extension calls palloc / palloc0 / MemoryContextAlloc, creates or switches a MemoryContext, picks AllocSet vs Slab vs Generation vs Bump, or debugs a context-shaped leak. Skip for plain malloc / free / jemalloc / mimalloc / tcmalloc, JVM / Go / .NET GC tuning, Rust Box / Rc / Arc / lifetimes, shared_buffers / work_mem production tuning, valgrind / heaptrack on non-PG programs, and C++ smart pointers.
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2 rules. About 0 are common, 1 is distinctive, and 1 is very specific to this project.
≈0
Common · estimate
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≈1
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1
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