Module: RSpecTelemetry::GcSample

Defined in:
lib/rspec_telemetry/gc_sample.rb

Overview

Snapshots GC counters around an example so example.finished can carry the GC cost of that example. GC time is process-global: an example may pay for garbage a previous example allocated, so treat the attribution as a trend indicator, not an exact per-example cost.

Class Method Summary collapse

Class Method Details

.delta(before, after) ⇒ Object 



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# File 'lib/rspec_telemetry/gc_sample.rb', line 22

def delta(before, after)
  return nil unless before && after

  {
    gc_time_ms: ((after[:total_time_ns] - before[:total_time_ns]) / 1_000_000.0).round(3),
    gc_count: after[:count] - before[:count],
    gc_major_count: after[:major] - before[:major],
    gc_minor_count: after[:minor] - before[:minor],
    allocated_objects: after[:allocated] - before[:allocated]
  }
end

.take ⇒ Object 



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# File 'lib/rspec_telemetry/gc_sample.rb', line 11

def take
  stat = GC.stat
  {
    total_time_ns: GC.total_time,
    count: stat[:count],
    major: stat[:major_gc_count],
    minor: stat[:minor_gc_count],
    allocated: stat[:total_allocated_objects]
  }
end