SamplingProfile

interface SamplingProfile

• bytecodes: string

  A formatted summary of the top bytecodes

  Example output:

  Tier breakdown:
  -----------------------------------
  LLInt:                   106  (1.545640%)
  Baseline:               2355  (34.339458%)
  DFG:                    3290  (47.973170%)
  FTL:                     833  (12.146398%)
  js builtin:              132  (1.924759%)
  Wasm:                      0  (0.000000%)
  Host:                    111  (1.618548%)
  RegExp:                   15  (0.218723%)
  C/C++:                     0  (0.000000%)
  Unknown Executable:      148  (2.158064%)
  
  Hottest bytecodes as <numSamples   'functionName#hash:JITType:bytecodeIndex'>
  273    'visit#<nil>:DFG:bc#63'
  121    'walk#<nil>:DFG:bc#7'
  119    '#<nil>:Baseline:bc#1'
  82    'Function#<nil>:None:<nil>'
  66    '#<nil>:DFG:bc#11'
  65    '#<nil>:DFG:bc#33'
  58    '#<nil>:Baseline:bc#7'
  53    '#<nil>:Baseline:bc#23'
  50    'forEach#<nil>:DFG:bc#83'
  49    'pop#<nil>:FTL:bc#65'
  47    '#<nil>:DFG:bc#99'
  45    '#<nil>:DFG:bc#16'
  44    '#<nil>:DFG:bc#7'
  44    '#<nil>:Baseline:bc#30'
  44    'push#<nil>:FTL:bc#214'
  41    '#<nil>:DFG:bc#50'
  39    'get#<nil>:DFG:bc#27'
  39    '#<nil>:Baseline:bc#0'
  36    '#<nil>:DFG:bc#27'
  36    'Dictionary#<nil>:DFG:bc#41'
  36    'visit#<nil>:DFG:bc#81'
  36    'get#<nil>:FTL:bc#11'
  32    'push#<nil>:FTL:bc#49'
  31    '#<nil>:DFG:bc#76'
  31    '#<nil>:DFG:bc#10'
  31    '#<nil>:DFG:bc#73'
  29    'set#<nil>:DFG:bc#28'
  28    'in_boolean_context#<nil>:DFG:bc#104'
  28    '#<nil>:Baseline:<nil>'
  28    'regExpSplitFast#<nil>:None:<nil>'
  26    'visit#<nil>:DFG:bc#95'
  26    'pop#<nil>:FTL:bc#120'
  25    '#<nil>:DFG:bc#23'
  25    'push#<nil>:FTL:bc#152'
  24    'push#<nil>:FTL:bc#262'
  24    '#<nil>:FTL:bc#10'
  23    'is_identifier_char#<nil>:DFG:bc#22'
  23    'visit#<nil>:DFG:bc#22'
  22    '#<nil>:FTL:bc#27'
  22    'indexOf#<nil>:None:<nil>'
  
• functions: string

  A formatted summary of the top functions

  Example output:

  
  Sampling rate: 100.000000 microseconds. Total samples: 6858
  Top functions as <numSamples  'functionName#hash:sourceID'>
  2948    '#<nil>:8'
  393    'visit#<nil>:8'
  263    'push#<nil>:8'
  164    'scan_ref_scoped#<nil>:8'
  164    'walk#<nil>:8'
  144    'pop#<nil>:8'
  107    'extract_candidates#<nil>:8'
   94    'get#<nil>:8'
   82    'Function#<nil>:4294967295'
   79    'set#<nil>:8'
   67    'forEach#<nil>:5'
   58    'collapse#<nil>:8'
  
• stackTraces: string[]

  Stack traces of the top functions