node garbage collection tracing flags

node-gc-debug-flags

 --log_gc (Log heap samples on garbage collection for the hp2ps tool.)
        type: bool  default: false
  --expose_gc (expose gc extension)
        type: bool  default: false
  --trace_gc (print one trace line following each garbage collection)
        type: bool  default: false
  --trace_gc_nvp (print one detailed trace line in name=value format after each garbage collection)
        type: bool  default: false
  --trace_gc_ignore_scavenger (do not print trace line after scavenger collection)
        type: bool  default: false
  --print_cumulative_gc_stat (print cumulative GC statistics in name=value format on exit)
        type: bool  default: false
  --trace_gc_verbose (print more details following each garbage collection)
        type: bool  default: false
  --trace_fragmentation (report fragmentation for old pointer and data pages)
        type: bool  default: false
  --trace_external_memory (print amount of external allocated memory after each time it is adjusted.)
        type: bool  default: false
  --trace_incremental_marking (trace progress of the incremental marking)
        type: bool  default: false
  --track_gc_object_stats (track object counts and memory usage)
        type: bool  default: false