cddl/contrib/dtracetoolkit/Examples/js_objgc_example.txt

   1 Following are examples of running js_objgc.d.
   2
   3 This script reports on the garbage collection of Java objects.  That is it
   4 will keep track of when resources are allocated to an object, and when
   5 resources are freed from an object.  It is useful for providing information on
   6 when garbage collection is not working correctly, as this can cause the
   7 browser to have a memory leak.
   8
   9 We trace object creation (+1) and destruction (-1), and provide a summary
  10 each second of the running tally of the object class and originating filename.
  11
  12 Here we can see it running on Code/JavaScript/func_clock.html
  13
  14 # js_objgc.d
  15 Tracing... Hit Ctrl-C to end.
  16
  17  FILE                        TOTAL CLASS                   2007 Sep 23 22:59:24
  18  func_clock.html                 1 Date
  19
  20  FILE                        TOTAL CLASS                   2007 Sep 23 22:59:25
  21  func_clock.html                 2 Date
  22
  23  FILE                        TOTAL CLASS                   2007 Sep 23 22:59:26
  24  func_clock.html                 3 Date
  25
  26  FILE                        TOTAL CLASS                   2007 Sep 23 22:59:27
  27  func_clock.html                 4 Date
  28
  29  FILE                        TOTAL CLASS                   2007 Sep 23 22:59:28
  30  func_clock.html                 5 Date
  31
  32  FILE                        TOTAL CLASS                   2007 Sep 23 22:59:29
  33  browser.js                      3 Function
  34  <null>                          5 Function
  35  func_clock.html                 6 Date
  36  <null>                          7 MouseEvent
  37
  38  FILE                        TOTAL CLASS                   2007 Sep 23 22:59:30
  39  browser.js                      3 Function
  40  <null>                          5 Function
  41  func_clock.html                 7 Date
  42  <null>                         10 MouseEvent
  43
  44  FILE                        TOTAL CLASS                   2007 Sep 23 22:59:31
  45  <null>                          1 Constructor
  46  <null>                          1 HTMLBodyElement
  47  <null>                          1 XPCNativeWrapper
  48  <null>                          1 XPC_WN_ModsAllowed_Proto_JSClass
  49  browser.js                      1 Array
  50  browser.js                      1 XPCNativeWrapper
  51  popup.xml                       1 Array
  52  func_clock.html                 7 Date
  53  <null>                         13 MouseEvent
  54  <null>                         18 Function
  55  browser.js                     20 Function
  56
  57  FILE                        TOTAL CLASS                   2007 Sep 23 22:59:32
  58  <null>                          1 BoxObject
  59  <null>                          1 Constructor
  60  <null>                          1 HTMLBodyElement
  61  <null>                          1 NodeList
  62  <null>                          1 UIEvent
  63  <null>                          1 XPCNativeWrapper
  64  <null>                          1 XPC_WN_ModsAllowed_Proto_JSClass
  65  <null>                          1 chrome://global/content/bindings/menu.xml#menu-iconic 84ff45a
  66  <null>                          1 chrome://global/content/bindings/menu.xml#menu-iconic 8befbba
  67  bookmarksMenu.js                1 Function
  68  browser.js                      1 Array
  69  browser.js                      1 XPCNativeWrapper
  70  popup.xml                       1 Function
  71  scrollbox.xml                   1 Function
  72  <null>                          2 Event
  73  popup.xml                       2 Array
  74  bookmarks.js                    3 With
  75  firebug-service.js              3 Object
  76  bookmarks.js                    6 Object
  77  bookmarks.js                    6 XPCWrappedNative_NoHelper
  78  func_clock.html                 8 Date
  79  firebug-service.js             10 Function
  80  <null>                         15 MouseEvent
  81  bookmarks.js                   19 Error
  82  browser.js                     20 Function
  83  bookmarks.js                   22 Function
  84  <null>                         39 XPCWrappedNative_NoHelper
  85  <null>                         44 Function
  86  <null>                         60 RegExp
  87  <null>                        191 XULElement
  88
  89 [... 39 seconds deleted ...]
  90
  91  FILE                        TOTAL CLASS                   2007 Sep 23 23:00:10
  92  <null>                          1 HTMLBodyElement
  93  <null>                          1 HTMLCollection
  94  <null>                          1 TreeColumns
  95  <null>                          1 XPCNativeWrapper
  96  <null>                          1 XPC_WN_NoMods_Proto_JSClass
  97  <null>                          1 XULTreeBuilder
  98  <null>                          1 chrome://global/content/bindings/menu.xml#menu-iconic 84ff45a
  99  <null>                          1 chrome://global/content/bindings/menu.xml#menu-iconic 8befbba
 100  <null>                          1 chrome://global/content/bindings/tree.xml#treebody 84caa3a
 101  <null>                          1 chrome://global/content/bindings/tree.xml#treebody 84e3a72
 102  <null>                          1 nsXPCComponents_Interfaces
 103  <null>                          1 nsXPCComponents_Results
 104  bookmarksMenu.js                1 Function
 105  browser.js                      1 Array
 106  browser.js                      1 XPCNativeWrapper
 107  browser.js                      1 XPC_WN_NoMods_Proto_JSClass
 108  nsUpdateService.js              1 XPC_WN_NoMods_Proto_JSClass
 109  nsUpdateService.js              1 nsJSCID
 110  popup.xml                       1 Function
 111  scrollbar.xml                   1 String
 112  scrollbox.xml                   1 Function
 113  tree.xml                        1 Array
 114  <null>                          2 Constructor
 115  <null>                          2 UIEvent
 116  <null>                          2 XPC_WN_ModsAllowed_Proto_JSClass
 117  <null>                          2 nsXPCComponents_Classes
 118  browser.js                      2 nsJSCID
 119  browser.js                      2 nsJSIID
 120  utilityOverlay.js               2 nsJSCID
 121  utilityOverlay.js               2 nsJSIID
 122  <null>                          3 Array
 123  <null>                          3 NodeList
 124  nsUpdateService.js              3 Array
 125  nsUpdateService.js              3 Object
 126  nsUpdateService.js              3 With
 127  utilityOverlay.js               3 Call
 128  tree.xml                        4 Function
 129  utilityOverlay.js               4 Function
 130  nsUpdateService.js              7 nsJSIID
 131  nsUpdateService.js             15 Function
 132  bookmarks.js                   22 Function
 133  text.xml                       23 String
 134  <null>                         36 BoxObject
 135  func_clock.html                42 Date
 136  bookmarks.js                   57 With
 137  firebug-service.js             57 Object
 138  bookmarks.js                   73 Error
 139  browser.js                     78 Function
 140  popup.xml                      82 Array
 141  bookmarks.js                  114 Object
 142  bookmarks.js                  114 XPCWrappedNative_NoHelper
 143  <null>                        157 MouseEvent
 144  firebug-service.js            172 Function
 145  <null>                        307 XPCWrappedNative_NoHelper
 146  <null>                        388 RegExp
 147  <null>                        488 Event
 148  <null>                        876 XULElement
 149  <null>                       1221 Function
 150
 151  FILE                        TOTAL CLASS                   2007 Sep 23 23:00:11
 152  <missed>                      -94 Date
 153  <missed>                      -34 Function
 154  <missed>                       -4 MouseEvent
 155  <missed>                       -2 Array
 156  <missed>                       -1 HTMLBodyElement
 157  <missed>                       -1 HTMLCollection
 158  <missed>                       -1 XPCNativeWrapper
 159  <missed>                       -1 XPC_WN_ModsAllowed_Proto_JSClass
 160  <null>                          0 Array
 161  <null>                          0 HTMLBodyElement
 162  <null>                          0 HTMLCollection
 163  <null>                          0 RegExp
 164  <null>                          0 TreeColumns
 165  <null>                          0 UIEvent
 166  <null>                          0 XPC_WN_NoMods_Proto_JSClass
 167  <null>                          0 XULTreeBuilder
 168  <null>                          0 nsXPCComponents_Classes
 169  <null>                          0 nsXPCComponents_Interfaces
 170  <null>                          0 nsXPCComponents_Results
 171  browser.js                      0 Array
 172  browser.js                      0 XPCNativeWrapper
 173  browser.js                      0 XPC_WN_NoMods_Proto_JSClass
 174  browser.js                      0 nsJSCID
 175  nsUpdateService.js              0 Array
 176  nsUpdateService.js              0 Function
 177  nsUpdateService.js              0 Object
 178  nsUpdateService.js              0 With
 179  nsUpdateService.js              0 XPC_WN_NoMods_Proto_JSClass
 180  nsUpdateService.js              0 nsJSCID
 181  nsUpdateService.js              0 nsJSIID
 182  scrollbar.xml                   0 String
 183  text.xml                        0 String
 184  tree.xml                        0 Array
 185  utilityOverlay.js               0 Call
 186  utilityOverlay.js               0 Function
 187  utilityOverlay.js               0 nsJSCID
 188  <null>                          1 NodeList
 189  <null>                          1 XPCNativeWrapper
 190  <null>                          1 chrome://global/content/bindings/menu.xml#menu-iconic 84ff45a
 191  <null>                          1 chrome://global/content/bindings/menu.xml#menu-iconic 8befbba
 192  <null>                          1 chrome://global/content/bindings/tree.xml#treebody 84caa3a
 193  <null>                          1 chrome://global/content/bindings/tree.xml#treebody 84e3a72
 194  bookmarksMenu.js                1 Function
 195  browser.xul                     1 Function
 196  func_clock.html                 1 Date
 197  popup.xml                       1 Function
 198  scrollbox.xml                   1 XULElement
 199  scrollbox.xml                   1 nsJSIID
 200  <null>                          2 Constructor
 201  <null>                          2 XPC_WN_ModsAllowed_Proto_JSClass
 202  browser.js                      2 nsJSIID
 203  scrollbox.xml                   2 Function
 204  tree.xml                        2 Function
 205  utilityOverlay.js               2 nsJSIID
 206  popup.xml                       3 Array
 207  bookmarks.js                    5 With
 208  firebug-service.js              5 Object
 209  <null>                          6 Event
 210  <null>                          6 MouseEvent
 211  bookmarks.js                    9 XPCWrappedNative_NoHelper
 212  <null>                         10 XPCWrappedNative_NoHelper
 213  bookmarks.js                   10 Object
 214  browser.js                     10 Function
 215  bookmarks.js                   15 Function
 216  firebug-service.js             16 Function
 217  <null>                         18 BoxObject
 218  bookmarks.js                   75 Error
 219  <null>                         79 Function
 220  <null>                        315 XULElement
 221 ^C
 222
 223 Just after time 23:00:10, garbage collection fired cleaning up many objects.
 224 The final output shows a much reduced object count including a negative
 225 count for objects created before this script was tracing.
 226
 227 If over the period of several minutes an object type is still steadily
 228 increasing, then that would be of interest.  Be patient, depending on the rate
 229 of object creation it can take over ten minutes for garbage collect to kick in.
 230