Fix multiple memory leaks in UserCountryMap #11350
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mattab
added
the
c: Performance
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Thank you @jvilk for the nice Pull request! We will review this for the next Piwik release 3.0.2 |
jvilk
pushed a commit
to jvilk/raphael
that referenced
this pull request
Feb 19, 2017
Without this change, it is very easy for an application to slowly leak memory as Raphael continues to add new keys to `eldata`. This memory leak turns out to be a problem for [Piwik](https://piwik.org/), which uses kartographer.js (which uses raphael) to draw an SVG image of the United States in its analytics dashboard ([see demo](https://demo.piwik.org/index.php?module=CoreHome&action=index&idSite=3&period=day&date=yesterday)). Every time the dashboard is redrawn, it spawns ~700 new Elements with data. [I've submitted a pull request that appropriately cleans up this data when the user navigates away from the page using `removeData`](matomo-org/matomo#11350), but Raphael leaves an empty object in the `eldata` map keyed on the element's old ID. Since kartographer/Piwik does not reuse IDs, `eldata` will grow continually on each redraw until the application is out of memory.
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Note that there is still a tiny small memory leak caused by Raphael's behavior. I've submitted a PR to Raphael that eliminates this tiny memory leak. Regardless, this PR alone turns the large memory leak into a tiny memory leak, so it is worth considering / merging before Raphael considers/merges the other fix. |
mattab
reviewed
Feb 21, 2017
| // │ Licensed under the MIT (http://raphaeljs.com/license.html) license.│ \\ | ||
| // └────────────────────────────────────────────────────────────────────┘ \\ | ||
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Hi @jvilk
Latest Raphael version seems to be 2.2.7
https://github.com/DmitryBaranovskiy/raphael/releases/tag/v2.2.7
could we maybe use this latest version instead of 2.2.1?
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@mattab Done. Rebased and updated commit.
added 3 commits
February 22, 2017 13:08
Kartograph stores data on SVG paths using Raphael: https://github.com/kartograph/kartograph.js/blob/f70bd295fa8b763d771f923a91b09564040eada3/src/core/maplayerpath.coffee#L30 Raphael stores this data in a *global* map, keyed on the path's ID: https://github.com/DmitryBaranovskiy/raphael/blob/fe8e591e1c86b5aeb4c252b33c08e647434504c5/raphael.js#L3168 https://github.com/DmitryBaranovskiy/raphael/blob/fe8e591e1c86b5aeb4c252b33c08e647434504c5/raphael.js#L306 UserCountryMap does the right thing and calls clear() on the Kartograph map to reclaim memory...: https://github.com/piwik/piwik/blob/6fab62e2229f9efadbcf43ff541b46f007fc6323/plugins/UserCountryMap/javascripts/visitor-map.js#L1332 ...which eventually calls `remove` on each of these SVG paths: https://github.com/kartograph/kartograph.js/blob/f70bd295fa8b763d771f923a91b09564040eada3/src/core/maplayerpath.coffee#L70 However, previous versions of Raphael (including 2.1.0) fail to call `removeData` to clear out the data associated with the SVG path in the global map, leading to a serious memory leak (heap grows by ~10MB each time the map refreshes): https://github.com/DmitryBaranovskiy/raphael/blob/7ba1a8258be64fdb517bc78fde44ff0e6188ca05/raphael.js#L4475 Later versions, including the latest 2.2.1, properly call `removeData` when `remove` is called: https://github.com/DmitryBaranovskiy/raphael/blob/master/raphael.js#L6842
The previous version of the code inappropriately tried to remove the event listener; the `function` object for `onResizeLazy` is different across maps.
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@jvilk thanks for that PR. Seems to fix the memory leak in this case. I'm gonna merge this now. While testing I maybe found another memory leak. When clicking the reload button for the usercountry widget the required memory still increases a lot, guess the widget is not destroyed before it's reloaded or something similar. Would you maybe be keen to have a look at that, too? |
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See commits for details. The Raphael upgrade fixes the most serious memory leak.
You can verify the problem(s) by following these steps.
Prerequisites: The map is visible on the dashboard (i.e., piwik has collected data recently)
Steps:
After about 150 dashboard navigations, Piwik will crash the tab in Chrome because it has filled the heap. (Chrome has a JavaScript heap size of 1.4GB)
In addition, every time you click on the "Dashboard" link in the left menu, Piwik appends a
linkelement to the end of thebodycontaining the CSS for the map. You can view this in the "Elements" tab of Chrome's development tools.