[Webkit-unassigned] [Bug 17534] Every XMLHttpRequest leaks memory, at least for Safari Activity window

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=17534


Brian Holt <brian.holt at samsung.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |brian.holt at samsung.com,
                   |                            |noel.vellemans at visionbms.co
                   |                            |m




--- Comment #16 from Brian Holt <brian.holt at samsung.com>  2013-06-28 02:13:40 PST ---
I have been investigating this leak in the context of WebKitGTK and have come to the conclusion that there is no leak and that any increase in the heap size due to XMLHttpRequests are because the garbage collector is not firing.

However, if garbage collection is forced by reloading the web page then all memory is recovered.

This chart from massif shows the heap profile for the attached test case, with 1000 XHRs (50MB), followed by a reload of the page, another 1000 XHRs and a final reload.

    MB
57.75^                                                                     #  
     |                                :@                                 ::#  
     |                              :@:@                               ::::#  
     |                             ::@:@::                           ::@:::#  
     |                          @::::@:@:                          ::::@:::#  
     |                        @@@: ::@:@:                         :::::@:::#  
     |                       @@ @: ::@:@:                       @::::::@:::#  
     |                     @:@@ @: ::@:@:                      :@::::::@:::#  
     |                   @:@:@@ @: ::@:@:                    :::@::::::@:::#: 
     |                 ::@:@:@@ @: ::@:@:                 :::: :@::::::@:::#: 
     |               @@: @:@:@@ @: ::@:@:               ::: :: :@::::::@:::#: 
     |              @@@: @:@:@@ @: ::@:@:              :: : :: :@::::::@:::#: 
     |           :::@@@: @:@:@@ @: ::@:@:             ::: : :: :@::::::@:::#: 
     |          @: :@@@: @:@:@@ @: ::@:@:           ::::: : :: :@::::::@:::#::
     |        ::@: :@@@: @:@:@@ @: ::@:@: :       :@: ::: : :: :@::::::@:::#::
     |      @@::@: :@@@: @:@:@@ @: ::@:@: :     :::@: ::: : :: :@::::::@:::#::
     |     :@@::@: :@@@: @:@:@@ @: ::@:@: :   ::: :@: ::: : :: :@::::::@:::#::
     |  :@@:@@::@: :@@@: @:@:@@ @: ::@:@: : ::::: :@: ::: : :: :@::::::@:::#::
     | ::@ :@@::@: :@@@: @:@:@@ @: ::@:@: ::::::: :@: ::: : :: :@::::::@:::#::
     | ::@ :@@::@: :@@@: @:@:@@ @: ::@:@: : ::::: :@: ::: : :: :@::::::@:::#::
   0 +----------------------------------------------------------------------->GB
     0                                                                   1.441

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