[PROF-8632] Ruby heap size profiling PoC #3261
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ivoanjo
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Nov 16, 2023
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| if (heap_recorder->enable_heap_size_profiling) { | ||
| // To get an accurate object size, we need to query our tracked live objects so lets iterate over the object_records | ||
| st_foreach(heap_recorder->object_records, st_object_records_iterate, (st_data_t) &internal_iteration_data); | ||
| } else { | ||
| // If we're just reporting heap counts/samples, it's faster to iterate on the heap records | ||
| st_foreach(heap_recorder->heap_records, st_heap_records_iterate, (st_data_t) &internal_iteration_data); | ||
| } |
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Uh, this is interesting -- may be worth calling out as an intro comment in the design of the heap recorder at some point.
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| ENFORCE_BOOLEAN(cpu_time_enabled); | ||
| ENFORCE_BOOLEAN(alloc_samples_enabled); | ||
| ENFORCE_BOOLEAN(heap_samples_enabled); | ||
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| struct stack_recorder_state *state; | ||
| TypedData_Get_Struct(recorder_instance, struct stack_recorder_state, &stack_recorder_typed_data, state); | ||
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| state->heap_recorder = heap_recorder_init(); | ||
| state->heap_recorder = heap_recorder_init(heap_size_enabled == Qtrue); |
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Minor: Don't forget the ENFORCE_BOOLEAN, to avoid typing accidents ;)
Also, perhaps we should raise if heap_samples_enabled == false but heap_size_enabled == true
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Replaced with more production-ready versions starting from #3281 |
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What does this PR do?
Build on top of #3246 by adding a new profile type capturing the weighted heap size of all live sampled objects in the heap.
Motivation:
Tracking the number of living objects alone does not give us an idea of resource (in this case, memory) utilisation. To understand how close we are to hitting limits and OOMing, we need to understand the cumulative size of things in heap.
Additional Notes:
How to test the change?
For Datadog employees:
credentials of any kind, I've requested a review from
@DataDog/security-design-and-guidance.Unsure? Have a question? Request a review!