Digging through the garbage
summary
Describes a working technique added to Benchee that measures per-process memory by tracing BEAM garbage-collection events rather than trying to disable GC. Uses Erlang’s spawn_opt to control initial heap size, the trace flag to collect GC start/end events, and accounts for the old heap (minor vs major GC). Finds and fixes a race that missed the first trace event; result is a reliable per-process memory metric with caveats about cross-process allocation.
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chapters (4)
- 0:00Start
- 17:22start with a high-level overview
- 29:46set a trace flag for all processes in a node
- 31:28set trace flags in the observer
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