12659 2007-02-06 23:31:33 -0800 JS objects not collected after closing window @ ebay.com/maps.google.com 2007-02-27 14:41:00 -0800 1 1 1 Unclassified WebKit WebCore JavaScript 420+ Mac OS X 10.4 RESOLVED FIXED InRadar P1 Normal --- 1 mjs ggaren ejalbert ian.eng.webkit sanjay12 oldest_to_newest 26083 0 mjs 2007-02-06 23:31:33 -0800 2007-01-25 10:38:22 Chris Petersen: * SUMMARY As part of my ongoing performance testing for Leopard, I have been asked to measure for memory leaks on sites that use heavy Javascript. I chose two specific test site: www.ebay.com and maps.google.com . My testing was done with Private browsing turned on and " Disable WebCore Caches " checked on (in the Debug caches window) From my testing , I was seeing remaining referenced javascript objects (in the caches window) after I closed the window that contained these specific sites. After closing the window that contained www.ebay.com, the caches window was showing total of 5808 (JS objects) that was referenced. After closing the window that contained www.maps.google.com, the caches window was showing total of 9823 (JS objects) that was referenced. Note: BEFORE I started the steps below, I completed the following. Clear cache and set a empty page as the default in Safari. Enable Private browsing and turn on "Disable Webcore Caches" * STEPS TO REPRODUCE 1. On stock 9A348, go to http://maps.google.com or http://www.ebay.com 2. After each site loads, complete a address search at http://maps.google.com or a item search at http://www.ebay.com 3. Note the amount of JS object are listed in the Caches window when search is completed. 4. Now, close this window and click the "Refresh" button 5. Notice the number of JS objects are reduced but some remain In my case, I was seeing the following after closing the window: After closing http://maps.google.com , the JS objects remained at Reference 1 - Total: 9823 (STRING) After closing http://www.ebay.com , the JS objects remained at Reference 1 - Total: 5808 (STRING) 2007-01-25 13:19:40 Geoff Garen: Big memory leak => blocker. 2007-01-29 16:21:18 Lee Bernhard: Perf BRB: Adding OSX-Perf Leopard Critical and OSX-Perf Memory. Recommend P1 for Leopard. 2007-01-29 18:08:30 Geoff Garen: I guess " blocker" means P1, anyway. 2007-02-05 13:15:58 Stephanie Lewis: By virtue of being Safari Blocker Reviewed, these have been Safari BRB Reviewed <rdar://problem/4954306> 22212 1 ian.eng.webkit 2007-02-22 13:57:04 -0800 It is probably because properties were not cleared properly when closing the window. In the same window you visited ebay or maps.google, open 'about:blank', and exit, no leaks happen. (In reply to comment #0) > 2007-01-25 10:38:22 Chris Petersen: > * SUMMARY > As part of my ongoing performance testing for Leopard, I have been asked to > measure for memory leaks on sites that use heavy Javascript. I chose two > specific test site: www.ebay.com and maps.google.com . My testing was done with > Private browsing turned on and " Disable WebCore Caches " checked on (in the > Debug caches window) > > From my testing , I was seeing remaining referenced javascript objects (in the > caches window) after I closed the window that contained these specific sites. > > After closing the window that contained www.ebay.com, the caches window was > showing total of 5808 (JS objects) that was referenced. > > After closing the window that contained www.maps.google.com, the caches window > was showing total of 9823 (JS objects) that was referenced. > > > Note: BEFORE I started the steps below, I completed the following. Clear cache > and set a empty page as the default in Safari. Enable Private browsing and > turn on "Disable Webcore Caches" > > > * STEPS TO REPRODUCE > 1. On stock 9A348, go to http://maps.google.com or http://www.ebay.com > 2. After each site loads, complete a address search at http://maps.google.com > or a item search at http://www.ebay.com > 3. Note the amount of JS object are listed in the Caches window when search is > completed. > 4. Now, close this window and click the "Refresh" button > 5. Notice the number of JS objects are reduced but some remain > > In my case, I was seeing the following after closing the window: > > After closing http://maps.google.com , the JS objects remained at Reference 1 - > Total: 9823 (STRING) > After closing http://www.ebay.com , the JS objects remained at Reference 1 - > Total: 5808 (STRING) > > 2007-01-25 13:19:40 Geoff Garen: > Big memory leak => blocker. > > 2007-01-29 16:21:18 Lee Bernhard: > Perf BRB: Adding OSX-Perf Leopard Critical and OSX-Perf Memory. Recommend P1 > for Leopard. > > 2007-01-29 18:08:30 Geoff Garen: > I guess " blocker" means P1, anyway. > > 2007-02-05 13:15:58 Stephanie Lewis: > By virtue of being Safari Blocker Reviewed, these have been Safari BRB Reviewed > > <rdar://problem/4954306> > 22033 2 mjs 2007-02-22 19:10:19 -0800 Might be fixed already, or if not, may be fixed by http://bugs.webkit.org/show_bug.cgi?id=12850 21489 3 ggaren 2007-02-26 07:06:29 -0800 Along the lines of what Ian said, if you do a manual GC after closing the window, all the objects get reclaimed. So I think there's something wrong with our "GC when closing the WebView" logic, where we GC just a little bit early, before some significant reference has been cleared. 21418 4 ggaren 2007-02-26 07:20:34 -0800 I see a far less significant number of live objects @ maps.google.com, so this may have been partially fixed by bug 12850. Still, I see a large number of live objects @ ebay.com. 21360 5 ian.eng.webkit 2007-02-26 11:20:07 -0800 I doubt this leak has anything to do with bug 12850 which would not release retained objects by going to "about:blank" page. Like Geoffrey said, it has something to do with not calling GC when closing a window. BTW, I also saw that a web page having several Frames triggers GC multiple times when leaving the page, each Frame destructor triggers a GC, which is very unnecessary IMH. (In reply to comment #4) > I see a far less significant number of live objects @ maps.google.com, so this > may have been partially fixed by bug 12850. Still, I see a large number of live > objects @ ebay.com. > 21325 6 ggaren 2007-02-26 12:35:31 -0800 I have a partial fix for this in my tree. Assigning bug to me. 21310 7 ggaren 2007-02-26 13:16:13 -0800 > BTW, I also saw that a web page having several Frames triggers GC multiple > times when leaving the page, each Frame destructor triggers a GC, which is very > unnecessary IMH. Cool. I've filed bug 12900 on that. 21082 8 13408 ggaren 2007-02-27 12:26:55 -0800 Created attachment 13408 patch 21086 9 13408 mjs 2007-02-27 12:40:06 -0800 Comment on attachment 13408 patch r=me Is there any way to make a test case for this? 21053 10 ggaren 2007-02-27 14:41:00 -0800 Committed revision 19894 (with test). 13408 2007-02-27 12:26:55 -0800 2007-02-27 12:40:06 -0800 patch patch-gc-window-close.txt text/plain 9163 ggaren SW5kZXg6IEphdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBKYXZhU2NyaXB0 Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDE5ODg0KQorKysgSmF2YVNjcmlwdENvcmUvQ2hhbmdl TG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsMjYgQEAKKzIwMDctMDItMjcgIEdlb2ZmcmV5 IEdhcmVuICA8Z2dhcmVuQGFwcGxlLmNvbT4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkg KE9PUFMhKS4KKyAgICAgICAgCisgICAgICAgIEZpeGVkIGh0dHA6Ly9idWdzLndlYmtpdC5vcmcv c2hvd19idWcuY2dpP2lkPTEyNjU5IHwgPHJkYXI6Ly9wcm9ibGVtLzQ5NTQzMDY+CisgICAgICAg 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