On Fri, Mar 21, 2014 at 5:00 PM, Nicholas Nethercote <n.netherc...@gmail.com> wrote: > On Fri, Mar 21, 2014 at 6:31 AM, Benjamin Smedberg > <benja...@smedbergs.us> wrote: >> >> What is the per-compartment overhead? > > It's hard to pin an exact number on it.
I talked to Bill about this today, and the overhead includes: - The JSCompartment object within SpiderMonkey. - Some additional shapes. - Cross-compartment wrapper objects and the table that holds them. The first two are unlikely to be significant. The third one is usually moderate (e.g. in my current session it's under 2 MiB for a 490 MiB JS runtime), though it can get high if you have compartments with lots of cross-links (gps had this problem in FHR and solved it by concatenating multiple modules into one). ---- On a related note, I just noticed that in my current session a lot of the system compartments appear twice or even more. Does anyone know how this can happen? I only have one browser window open. Nick 571 (100.0%) -- js-main-runtime-compartments ├──518 (90.72%) -- system │ ├───18 (03.15%) ── [System Principal], inProcessTabChildGlobal?ownedBy=chrome://browser/content/browser.xul [18] │ ├────6 (01.05%) ── [System Principal], inProcessTabChildGlobal?ownedBy=data:application/vnd.mozilla.xul+xml;charset=utf-8,<window%20id='win'/> [6] │ ├────3 (00.53%) ── [System Principal], [anonymous sandbox] (from: resource://gre/modules/XPIProvider.jsm -> jar:file:///Users/njn/Library/Application%20Support/Firefox/Profiles/puna0zr8.new/extensions/jid1-xufzosoflzs...@jetpack.xpi!/bootstrap.js:264) [3] │ ├────3 (00.53%) ── [System Principal], about:blank [3] │ ├────3 (00.53%) ── [System Principal], chrome://browser/content/bookmarks/bookmarksPanel.xul [3] │ ├────2 (00.35%) ── [System Principal], about:newtab [2] │ ├────2 (00.35%) ── [System Principal], about:treestyletab-group?title=Work%20Tools&temporary=true [2] │ ├────2 (00.35%) ── [System Principal], chrome://browser/content/baseMenuOverlay.xul [2] │ ├────2 (00.35%) ── [System Principal], chrome://browser/content/browser.xul [2] │ ├────2 (00.35%) ── [System Principal], chrome://browser/content/downloads/download.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://browser/content/macBrowserOverlay.xul [2] │ ├────2 (00.35%) ── [System Principal], chrome://browser/content/places/placesOverlay.xul [2] │ ├────2 (00.35%) ── [System Principal], chrome://browser/content/search/search.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://browser/content/socialchat.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://browser/content/tabbrowser.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://browser/content/urlbarBindings.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://chatzilla/content/browserOverlay.xul [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/autocomplete.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/browser.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/button.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/general.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/listbox.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/menu.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/notification.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/popup.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/progressmeter.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/resizer.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/richlistbox.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/scrollbar.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/scrollbox.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/splitter.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/stringbundle.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/tabbox.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/text.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/textbox.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/toolbar.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/toolbarbutton.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/bindings/tree.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/editMenuOverlay.xul [2] │ ├────2 (00.35%) ── [System Principal], chrome://global/content/platformHTMLBindings.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://masspasswordreset/content/firefoxOverlay.xul [2] │ ├────2 (00.35%) ── [System Principal], chrome://treestyletab/content/base-toolbar-binding.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://treestyletab/content/res/bookmarkMultipleTabs.xul [2] │ ├────2 (00.35%) ── [System Principal], chrome://treestyletab/content/treestyletab.xml [2] │ ├────2 (00.35%) ── [System Principal], chrome://treestyletab/content/treestyletab.xul [2] │ ├────2 (00.35%) ── [System Principal], resource://gre/modules/commonjs/sdk/core/heritage.js (from: resource://gre/modules/XPIProvider.jsm -> jar:file:///Users/njn/Library/Application%20Support/Firefox/Profiles/puna0zr8.new/extensions/jid1-xufzosoflzs...@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js:213) [2] │ ├────2 (00.35%) ── [System Principal], resource://gre/modules/commonjs/sdk/system/events.js (from: resource://gre/modules/XPIProvider.jsm -> jar:file:///Users/njn/Library/Application%20Support/Firefox/Profiles/puna0zr8.new/extensions/jid1-xufzosoflzs...@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js:213) [2] _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
